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Letteratura scientifica selezionata sul tema "Cyclohexane"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 9 giugno 2025

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Articoli di riviste sul tema "Cyclohexane"

1

Guo, Jia Neng, Jin Zhi Lin, Xin Liu, Qi Wei Wang, Ge Gao, Xiang Zhang, Xin Ge Shi, Bei Yang, and Hai Bo Jin. "The Progress of Catalyst for Cyclohexane Dehydrogenation Processes." Advanced Materials Research 953-954 (June 2014): 1261–68. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1261.

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Cyclohexane dehydrogenation is an important process in the petrochemical industry, chemical raw material such as cyclohexanol, cyclohexanone,benzene and cyclohexene can be produced from which.Divided cyclohexane dehydrogenation into catalytic dehydrogenation or oxidative dehydrogenation, homogeneous or heterogeneous reaction. Summarized vary catalysts, active constituent and process conditions in dehydrogenation process.

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2

Kurganova, E. A., A. S. Frolov, S. A. Kanaev, G. N. Koshel, A. A. Petukhov, G. V. Rybina, V. V. Plakhtinskii, V. S. Kabanova, and A. A. Smurova. "Epoxidation of cyclohexene with cyclohexyl hydroperoxide." Fine Chemical Technologies 18, no. 6 (January 18, 2024): 505–16. http://dx.doi.org/10.32362/2410-6593-2023-18-6-505-516.

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Objectives. To investigate the regularities of the process of joint production of epoxycyclohexane, cyclohexanol, and cyclohexanone using the cyclohexene epoxidation reaction with cyclohexyl hydroperoxide in the presence of an ammonium paramolybdate catalyst, representing an alternative to the method of cyclohexanol and cyclohexanone synthesis by alkaline catalytic decomposition of cyclohexyl hydroperoxide.Methods. The qualitative and quantitative analysis of the obtained intermediate and target compounds was determined using modern physicochemical research methods: gas–liquid chromatography using the Chromatec-Crystal 5000.2 hardware and software complex with a flame ionization detector and infrared spectroscopy on an RX-1 infrared Fourier spectrometer. The content of hydroperoxide in the oxidation products was determined using iodometric titration, while the carboxylic acid content was determined by the titrimetric method based on the neutralization reaction.Results. The presented method for obtaining cyclohexanol and cyclohexanone together with epoxycyclohexane by the reaction of cyclohexene epoxidation with cyclohexyl hydroperoxide containing cyclohexane in the products of high-temperature liquid-phase oxidation is experimentally substantiated. The influence of various technological parameters on the process of liquid-phase oxidation of cyclohexane to hydroperoxide is described. The conditions for carrying out this reaction are determined to ensure the achievement of a content of cyclohexyl hydroperoxide of 1.5 wt % in the products of oxidation. The regularities of the epoxidation reaction of the synthesized cyclohexyl hydroperoxide with cyclohexene in the presence of an ammonium paramolybdate catalyst are analyzed.Conclusions. Epoxidation of cyclohexene with cyclohexyl hydroperoxide produced epoxycyclohexane at a yield of 80–90% and a conversion of cyclohexane hydroperoxide of 85%.

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3

Frolov, A. S., E. A. Kurganova, E. M. Yarkina, N. V. Lebedeva, G. N. Koshel, and A. S. Kalenova. "INTENSIFICATION OF THE CYCLOHEXANE LIQUID PHASE OXIDATION PROCESS." Fine Chemical Technologies 13, no. 4 (August 28, 2018): 50–57. http://dx.doi.org/10.32362/2410-6593-2018-13-4-50-57.

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Liquid-phase oxidation of cyclohexane to cyclohexanol and cyclohexanone was studied in the absence of solvents under an air pressure of 0.5-5 MPa, in the temperature range 115-150 °C, catalyzed by N-hydroxyphthalimide (N-HPI). It was established for the first time that the use of N-HPI as a catalyst in place of the conventionally used metal salts of variable valence allowed a 2-3-fold increase in the conversion of the initial hydrocarbon and selectivity from 70-75 to 90%. The combined use of N-HPI with cobalt(II) acetate results in an additional increase in the conversion of cyclohexane by 30-40%, the selectivity of cyclohexanol and cyclohexanone formation to 94-97%, which seems to be due to the synergistic effect between the two components of the catalyst. The mechanism of catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone is discussed. It has been suggested that N-HPI plays a dual role in the oxidation of cyclohexane: it catalyzes the conversion of cyclohexane to cyclohexanol and cyclohexanone and, on the other hand, promotes the conversion of cyclohexanol to cyclohexanone, thereby substantially reducing the formation of adipic acid and its esters, by-products of the reaction, and increases selectivity of oxidation. This also explains the unusually high (1.3-1.5 : 1) ketone: alcohol ratio in the oxidation products of cyclohexane in the presence of N-HPI. The high selectivity of the formation of the desired products, the conversion of cyclohexane, the moderate temperature, the available catalyst, suggest that this method of oxidizing cyclohexane to cyclohexanol and cyclohexanone may be of interest for further practical use.

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4

Wang, Lei, Ming Qiao Zhu, Jian Gang Lu, and Hong Ding Hu. "Uncatalyzed Oxidation of Cyclohexane in the Microchannels." Key Engineering Materials 562-565 (July 2013): 1542–47. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1542.

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The oxidation of cyclohexane in the microchannels not only improves the safety of the reaction, but also the performance of the oxidation reaction. Different gas-liquid micro mixers were used for the mixing of gas and liquid before entering into microchannels, and SIMM-V2 performed best of all. Excellent slug/plug flow can be formed in the microchannels after mixing in the gas-liquid micro mixer when the molar ratio of oxygen to cyclohexane is less than 0.5:1. The conversion of cyclohexane increased as the residence time increased, but the selectivity of cyclohexanol and cyclohexanone increased first and then decreased. At the reaction temperature of 200 °C, with the flow rate of the solvent isopropanol being 1 mL/min and the molar ratio of oxygen to cyclohexane being 0.15:1, both the conversion of cyclohexane and selectivity of cyclohexanol and cyclohexanone increased with the increase of pressure. The conversion of cyclohexane and selectivity of cyclohexanol and cyclohexanone reached 10.10% and 66.93% respectively at the pressure of 8 MPa. It is indicated that the new process by use of uncatalyzed cyclohexane oxidation in the microchannels will have very attractive prospects in the improvement of the safety, intensification of the gas-liquid mass transfer and obtaining good reactive performance. Therefore, the technology shows good potential in industrial applications.

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5

Alshehri, Salimah, and Mohamed Abboud. "Synthesis and characterization of mesoporous silica supported metallosalphen-azobenzene complexes: efficient photochromic heterogeneous catalysts for the oxidation of cyclohexane to produce KA oil." RSC Advances 14, no. 37 (2024): 26971–94. http://dx.doi.org/10.1039/d4ra04698f.

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The oxidation of cyclohexane to produce KA oil (cyclohexanone and cyclohexanol) is important industrially but faces challenges such as low cyclohexane conversion at high KA oil selectivity, and difficult catalyst recyclability.

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6

Aghamammadova, S. A. "MECHANISM OF BIOMIMETIC OXIDATION OF CYCLOHEXANE TO CYCLOHEXANONE BY HYDROGEN PEROXIDE." Azerbaijan Chemical Journal, no. 1 (April 9, 2021): 61–66. http://dx.doi.org/10.32737/0005-2531-2021-1-61-66.

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The process of gas-phase oxidation of cyclohexane was studied in the presence of a heterogeneous biomimetic catalyst (per-FTPhPFe(III)OH/Al2O3), at 130–2500C, in which high yields of cyclohexanone and cyclohexanol were obtained up to 25.2% with a selectivity of ~80% at a cyclohexane conversion of 34%. The mechanism of the conversion of cyclohexane to cyclohexanone has been studied in detail, and the coherently synchronized character of the reaction proceeding is shown

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7

Zhang, Jiao Jing, Hua Lin Song, Jian Wang, and Hua Song. "Experimental Study on Catalytic Oxidation of Cyclohexane Catalyzed by Phosphomolybdic Acid." Advanced Materials Research 549 (July 2012): 411–14. http://dx.doi.org/10.4028/www.scientific.net/amr.549.411.

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The catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over phosphomolybdic acid were studied. Factors such as the amount of catalyst, amount of the oxidant (H2O2), reaction temperature and reaction time were investigated. The conversion of cyclohexane was 35.35%, the total selectivity to cyclohexanone and cyclohexanol was 97.68% at a reaction temperature of 70 °C, reaction time of 8 h, 10 mL of acetone, 0.01 g of phosphomolybdic acid and 0.5 mL of hydrogen peroxide.

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8

Henríquez, Adolfo, Victoria Melin, Nataly Moreno, Héctor D. Mansilla, and David Contreras. "Optimization of Cyclohexanol and Cyclohexanone Yield in the Photocatalytic Oxofunctionalization of Cyclohexane over Degussa P-25 under Visible Light." Molecules 24, no. 12 (June 15, 2019): 2244. http://dx.doi.org/10.3390/molecules24122244.

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The sustainable transformation of basic chemicals into organic compounds of industrial interest using mild oxidation processes has proved to be challenging. The production of cyclohexanol and cyclohexanone from cyclohexane is of interest to the nylon manufacturing industry. However, the industrial oxidation of cyclohexane is inefficient. Heterogeneous photocatalysis represents an alternative way to synthesize these products, but the optimization of this process is difficult. In this work, the yields of photocatalytic cyclohexane conversion using Degussa P-25 under visible light were optimized. To improve cyclohexanol production, acetonitrile was used as an inert photocatalytic solvent. Experiments showed that the use of the optimized conditions under solar light radiation did not affect the cyclohexanol/cyclohexanone ratio. In addition, the main radical intermediary produced in the reaction was detected by the electronic paramagnetic resonance technique.

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9

Alnefaie, Reem S., Mohamed Abboud, Abdullah Alhanash, and Mohamed S. Hamdy. "Efficient Oxidation of Cyclohexane over Bulk Nickel Oxide under Mild Conditions." Molecules 27, no. 10 (May 14, 2022): 3145. http://dx.doi.org/10.3390/molecules27103145.

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Nickel oxide powder was prepared by simple calcination of nickel nitrate hexahydrate at 500 °C for 5 h and used as a catalyst for the oxidation of cyclohexane to produce the cyclohexanone and cyclohexanol—KA oil. Molecular oxygen (O2), hydrogen peroxide (H2O2), t-butyl hydrogen peroxide (TBHP) and meta-chloroperoxybenzoic acid (m-CPBA) were evaluated as oxidizing agents under different conditions. m-CPBA exhibited higher catalytic activity compared to other oxidants. Using 1.5 equivalent of m-CPBA as an oxygen donor agent for 24 h at 70 °C, in acetonitrile as a solvent, NiO powder showed exceptional catalytic activity for the oxidation of cyclohexane to produce KA oil. Compared to different catalytic systems reported in the literature, for the first time, about 85% of cyclohexane was converted to products, with 99% KA oil selectivity, including around 87% and 13% selectivity toward cyclohexanone and cyclohexanol, respectively. The reusability of NiO catalyst was also investigated. During four successive cycles, the conversion of cyclohexane and the selectivity toward cyclohexanone were decreased progressively to 63% and 60%, respectively, while the selectivity toward cyclohexanol was increased gradually to 40%.

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10

Zhang, Jiao Jing, Bing Bai, and Hua Song. "Experimental Study on Cyclohexane by Catalytic Oxidation Using H₂O₂/Ferrous Sulfate." Advanced Materials Research 233-235 (May 2011): 1288–91. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1288.

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Catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol using hydrogen peroxide over ferrous sulfate catalyst at atmospheric condition was studied. Effect of the solvent volume, catalyst amount, hydrogen peroxide volume, reaction temperature, reaction time on reaction was investigated. Results showed that using 10 mL of acetone, 0.02 g of a ferrous sulfate and 0.5 mL of hydrogen peroxide at thereaction temperature of 80 °C for 8 h, the conversion of cyclohexane was 35.35%, the total selectivity of cyclohexanone and cyclohexanol was 94.06%.

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Più fonti

Tesi sul tema "Cyclohexane"

1

Sutton, Peter William. "Ketene cycloadditions to cyclohexa-3,5-diene-cis-1,2-diol acetals : preparation of polyhydroxylated cyclohexane derivatives." Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294477.

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2

Lima, Liliane Schier de. "Oxidação aerobica de cicloexano e cicloexeno usando carvão ativado como catalisador." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249522.

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Orientador: Ulf Friedrich Schuchardt<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-06T15:18:09Z (GMT). No. of bitstreams: 1 Lima_LilianeSchierde_M.pdf: 699085 bytes, checksum: 864f8f983b1935cceb9fe8d839e3fcf4 (MD5) Previous issue date: 2006<br>Resumo: O interesse nas reações de oxidação do cicloexano e cicloexeno tem sido foco de muitas pesquisas nos últimos anos, objetivando a busca de reações com maiores rendimentos e seletividades. A rota sintética comercialmente utilizada oxida o cicloexano a cicloexanol e cicloexanona com rendimentos muito baixos (em torno de 4 %), fomentando ainda mais a busca por rotas alternativas de oxidação. O presente trabalho estudou a oxidação direta de cicloexano e cicloexeno a 140ºC e pressões de até 50 bar usando carvões ativados de origem mineral e vegetal como catalisadores. O carvão ativado, por se tratar de um material com uma alta área superficial e de característica hidrofóbica, é compatível com reações de hidrocarbonetos e, então, foi utilizado como catalisador para estas oxidações. As oxidações diretas do cicloexano, nas condições em que foram realizadas, apresentaram resultados de conversão abaixo de 1% e, em alguns casos, com resultados irreprodutíveis. Para as reações de oxidação do cicloexeno, além de algumas mudanças nas condições das reações, foram utilizados como catalisadores carvão ativado impregnados com Pd. As reações apresentaram boas conversões, que variaram de 5 a 90%. Os carvões minerais previamente tratados com ácido clorídrico conduziram a melhores resultados nas oxidações catalíticas do cicloexeno, porém um comportamento inverso foi observado para os carvões vegetais. O Pd impregnado favoreceu a formação da bifenila, alcançando 100% de seletividade para este produto quando usou-se um carvão comercial contendo 5% de Pd.<br>Abstract: The concerning about cyclohexane and cyclohexene oxidation reactions has been subject of many researches lately, in order to find yielder and more selective reactions. The more common synthetic path at the industry, oxidate the cyclohexane to cyclohexanol and cyclohexanone with very low yield (almost 4%), what stimulates the researches looking for alternatives oxidations paths. The present work has studied the straight oxidation from the cyclohexane and cyclohexene in a temperature of 140°C and pressures until 50 bars using activated carbon, mineral and vegetal origins, as a catalyser. Due the activated carbon is a material with very high surface area and it has also hydrophobic characteristics, it is compatible with hydrocarbons reactions, and then it has been used here as catalyser to this oxidations. The straight cyclohexane oxidations, in that conditions, has showed conversion results lower than 1% and, in some cases, with non reproducible results. To the cyclohexene oxidation reactions, besides some changes in the reactions conditions, it has been used as a catalyser, activated carbon impregnated with Pd. Those reactions showed better conversions, between 5% and 90%. The mineral carbons, previously treated with chloride acid, lead to better results in the catalytic oxidation of the cyclohexene, although an inverse behavior has been observed to the vegetal carbons. The Pd impregnation has helped the biphenyl production, reaching 100% selectivity to this product when using a carbon containing 5% of Pd.<br>Mestrado<br>Quimica Organica<br>Mestre em Química

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3

Mitropetros, Konstantinos. "Shock induced bubble explosions in liquid cyclohexane." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974965936.

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4

Graham, Isla Patricia. "Chemoenzymatic approches to cyclohexane based natural products." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485199.

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Chapter 1 provides an overview of cis-dihydrodiols. The biological aspects of enzymatic hydroxylation are discussed, followed by the important stereochemical aspects of cis-diol metabolites. A selection of chemoenzymatic approaches to important natural products from cis-dihydrodiols is given. Chapter 2 introduces the Amaryllidaceae and Sceletium alkaloids, giving an insight into their biological sigIJificance. Previous approaches to important members of both alkaloid classes are given. Synthesis of a ke~ intermediate for the synthesis of mesembranol is described. The development of successful conditions to effect a Suzuki reaction of cis-dihydrodiols forms a key component of the synthetic strategy. Following on from this, Diels-Alder reactions of substrates derived from cisdihydrodiols, studies towards a resolving agent and biotransformation studies are discussed. Chapter 3 is devoted to synthesis of cis-3a-aryloctahydroindole nuclei, common to many Amaryllidaceae alkaloids. Previous approaches followed by our synthetic endeavours to gain access to this nucleus from cis-dihydrodiols are outlined. Chapter 4 begins with an introduction to 2-deoxystreptamine, an important aminocyclitol. Previous approaches to 2-deoxystreptamine are discussed. An important intermediate in several synthe~es is identified, followed by approaches to it from cis-dihydrodiols. The second half of the chapter is concerned with synthesis of valeinamine. Synthesis of a 3,4-trans-diol from iodobenzene-cis-diol is outlined. Chapter 5 contains full experimental details, including spectral and analytical data, for the compounds synthesised during this work.

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5

Durie, Alastair J. "Multivicinal fluorine substitution of the cyclohexane ring." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/8080.

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Highly polar organic fluorinated motifs are of interest in materials chemistry, for example, in liquid crystal applications. Cyclohexane is an important and widely used structural motif within organic chemistry. Work has been carried out to prepare single stereoisomers of multivicinal fluorinated cyclohexanes, a class of compounds that has not been previously produced. A synthesis of the all-syn-1,2,3,4-tetrafluorocyclohexane, in 9 steps from cyclohexa-1,3-diene will be presented. The ¹⁹F NMR spectra of the all-syn-1,2,3,4-tetrafluorocyclohexane shows interesting dynamic conformational effects. This is a small polar organic molecule, which was crystalline at room temperature. The structure of the compound was confirmed by single crystal X-ray diffraction studies. The synthesis of the all-syn-1,2,4,5-tetrafluorocyclohexane from cyclohexa-1,4-diene is also presented. The synthesis of a single diastereoisomer of 1,2,3,4,5,6-hexafluorocyclohexane, derived from benzene in 5 steps, is presented. As with the tetrafluoro compounds, the ¹⁹F NMR spectra of this compound shows dynamic conformational effects. The structure of the compound was confirmed by single crystal X-ray diffraction studies. The 1,2,4,5-tetrafluorocyclohexane motif was elaborated to contain a phenyl group, producing “rod-like” molecules. This motif was synthesised in view of potential applications for liquid crystalline materials.

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6

Mpuhlu, Batsho. "Vapour phase dehydrogenation of cyclohexane on microstructured reactors." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/8661.

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The work that is described in this thesis forms part of the research and development projects at InnoVenton: NMMU Institute of Chemical Technology in collaboration with Sasol Technologies. The broader view of the project was testing on the so-called “Small Production Platforms” (SPP’s). In particular the main aim of this study was to investigate the effect of micro-structuring on the heterogeneous catalysed, vapour-phase oxidative dehydrogenation of cyclohexane in the presence of air. Ground work studies were done to provide a proper comparison of the micro-structured reactor with a traditional fixed-bed reactor. These included evaluation of a proper vanadium pyrophosphate catalyst for the reaction, testing of reaction parameters for the oxidative dehydrogenation reaction on a fixed-bed reactor and lastly comparing the performance of the micro-structured reactor to that of the fixed-bed reactor Various vanadium pyrophosphate catalysts that were tested for activity included: bulk (VO)2P2O7, bulk (VO)2P2O7 promoted with Fe, (VO)2P2O7 supported on -Al2O3 and Fe promoted (VO)2P2O7 supported on -Al2O3. These catalysts showed significant differences in TOF, however it was not conclusive from the results whether these differences may be traced to increased activity for dehydrogenation for different catalysts since all reactions were run under conditions of oxygen deficiency. It is, however, clear that Fe promotion significantly increase activity, irrespective of the relative degrees of oxidative dehydrogenation and normal dehydrogenation. The Fe promoted catalyst was further tested for long term stability in-view of using it as the catalyst in the micro-structured reactor. These studies showed the catalyst to have a high degree of stability with minimal structural changes under the reaction conditions used. Various response surface models describing the variation in each of the cyclohexane conversion, cyclohexene selectivity, and benzene selectivity, respectively when changing reaction condition, were derived by means of multiple regression. To obtain some idea of the degree and nature of the normal dehydrogenation reaction, the amount of deficit oxygen was estimated from the measured results for cyclohexane conversion and cyclohexene and benzene selectivities. These estimated values were also modelled as described above. The regression models were used to interpret specific trends in the responses for the oxidative dehydrogenation of cyclohexane and account for the oxygen deficit in the system. The performance of a fixed bed tubular reactor (FBR) and micro-structured sandwich reactor (MSSR) were compared over an Fe promoted vanadium pyrophosphate. Reactor performance was evaluated by varying specific reaction conditions (temperature and space velocity). Subsequently the turn-over frequencies, conversion and selectivities from the two reactors were compared. The conversion achieved in the micro-structured reactor was observed to be significantly higher than that achieved in the fixed-bed reactor at all reaction parameters. This is despite the fact that the total amount of catalyst in the micro-structured reactor is approximately 5 times less than that used in the fixed bed reactor. In addition, the contact time (1/MHSV) in the micro-structured reactor is also significantly shorter than in the fixed-bed reactor.

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7

Morin, Cynthia. "Étude de l'adsorption du cyclohexane et du cyclohexanone sur une surface polycristalline de carbure de molybdène, ß-Mo¦2C." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ49040.pdf.

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8

Trower, M. K. "The oxidation of cyclohexane by a Xanthobacter species." Thesis, Nottingham Trent University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356463.

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9

Carcenac, Yvan. "Synthèse et étude de dérivés fluorés du cyclohexane." Versailles-St Quentin en Yvelines, 2005. http://www.theses.fr/2005VERS0042.

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La thèse présentée est une étude des équilibres conformationnels de cyc10hexanes 1,4¬disubstitués de stéréoisomérie cis, porteurs d'un groupement fluoré (CF3, C2Fs, CFH2, CF2H, OCF3 et SCF3) et d'un groupement alkyle ou aryle. Dans une première partie est abordée la synthèse des cyc10hexanes fluorés: Les composés porteurs des substituants trifluorométhyle, entafluoroéthyle et trifluorométhylthio ont été obtenus par utilisation de réactifs perfluorés. Les composés substitués par des groupements fluorométhyle, difluorométhyle et trifluorométhoxy ont été synthétisés par réactions de fluorations. La mise au point des différentes synthèses est décrite. Dans une seconde partie, les équilibres conformationnels de ces composés sont étudiés par RMN 19F à température variable. L'énergie nécessaire au passage des substituants de la position équatoriale à la position axiale nous permet d'évaluer les interactions stériques et électroniques des différents groupements avec leur environnement. Les effets des substituants sur les déplacements chimiques en RMN BC sont également commentés<br>The aim of this thesis was to study conformational equilibria of cis 1,4-disubstituted cyc1ohexanes, bearing a fluorinated group (CP3, C2Ps, CPH2, CP2H, OCP3 and SCP3) and an aIkyI or aryl group. Ln the first part of this manuscript, the synthe sis of fluorinated cyc10hexanes is described : compounds bearing trifluoromethyIe, pentafluoroethyIe or trifluoromethylthio. Substituents were obtained by the use of perfluorinated reagents, while compounds possessing a fluoromethyIe, difluoromethyle or trifluoromethoxy group were synthesized by fluorination reactions. The deveIopment ofthose various approches is described. Ln a second part, conformational analysis of these compounds was studied by 19p NMR at various temperature. The energy necessary for the passage of the substituents from the equatorial position to the axial position allowed us to evaluate the steric and electronic interactions of the different groups with their environment. The effects of the substituents on the chemical shifts in BC NMR are also commented

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10

Razafitianamaharavo, Angelina. "Étude structurale du film de cyclohexane physisorbé sur graphite : Étude thermodynamique et structurale du film mixte (krypton-cyclohexane) physisorbe sur graphite." Nancy 1, 1989. http://www.theses.fr/1989NAN10080.

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La caractérisation structurale du cyclohexane adsorbe sur graphite a été effectuée entre 77**(O)K et 260**(O)K par diffraction de neutrons et de rayons X. Elle a permis de proposer un diagramme de phases 2D rendant compte de trois structures solides qui sont par ordre de densité croissante, commensurable, hexagonale incommensurable et rectangulaire centrée

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Più fonti

Libri sul tema "Cyclohexane"

1

Canada. Environmental Protection Programs Directorate. Technical Services Branch. and Canada Environmental Protection Service, eds. Cyclohexane. Ottawa: The Service, 1985.

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2

Bíliková, Anna. Stanovenie cyklohexanolu a cyklohexanónu vo vodách. Bratislava: Výskumný ústav vodného hospodárstva, 1988.

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3

Scheidges, Cornelius. Darstellung von Guaianolid-Systemen durch Thermolyse substituierter Cyclohexane. [s.l.]: [s.n.], 1986.

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4

Canada. Environmental Protection Programs Directorate. Technical Services Branch., ed. Cyclohexane: Environmental and technical information for problem spills. Ottawa, Ont: Environment Canada, Environmental Protection Service, 1985.

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5

S, Fairhurst, Standring P, Cross H, and Great Britain. Health and Safety Executive., eds. Cyclohexane, Cumene, Para-dichlorobenzene (p-DCB), Chlorodifluoromethane (CFC 22). London: HMSO, 1991.

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6

Nesterov, S. V. Dicyclohexanocrown ethers: From synthesis to radiochemical applications. New York: Nova Science Publishers, 2011.

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E, Ėli͡a︡shberg M., та Institut geokhimii i analiticheskoĭ khimii im. V.I. Vernadskogo., ред. Interpretirovannye kolebatelʹnye spektry uglevodoradov-proizvodnykh t͡s︡iklogeksana i t͡s︡iklopentana. Moskva: "Nauka", 1988.

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Wang, Zhandong. Experimental and Kinetic Modeling Study of Cyclohexane and Its Mono-alkylated Derivatives Combustion. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5693-2.

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Laboratory, Occupational Medicine and Hygiene. Rubber fume in air measured as 'total particulates' and 'cyclohexane soluble material': Laboratory method using filters and gravimetric estimation. Bootle: Health and Safety Executive, 1987.

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Laboratory, Occupational Medicine and Hygiene. Coal tar pitch volatiles: measurement of particulates and cyclohexane soluble materialin air: Laboratory method using filters and gravimetric estimation. Bootle: Health and Safety Executive, 1990.

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Più fonti

Capitoli di libri sul tema "Cyclohexane"

1

Bährle-Rapp, Marina. "Cyclohexane." In Springer Lexikon Kosmetik und Körperpflege, 137. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_2590.

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Gooch, Jan W. "Cyclohexane." In Encyclopedic Dictionary of Polymers, 189. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3239.

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3

Hallenbeck, William H., and Kathleen M. Cunningham-Burns. "Cyclohexane." In Pesticides and Human Health, 44. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5054-8_24.

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Lide, David R. "Cyclohexane." In Handbook of Organic Solvents, 105. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003575191-105.

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Howard, Philip H., Gloria W. Sage, William F. Jarvis, and D. Anthony Gray. "Cyclohexane." In Handbook of Environmental Fate and Exposure Data For Organic Chemicals, Volume II, 120–28. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003418863-18.

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Grozin, Andrey. "Cyclohexane." In Introduction to Mathematica® for Physicists, 193–208. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00894-3_24.

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Winkelmann, Jochen. "Diffusion coefficient of cyclohexene in cyclohexane." In Diffusion in Gases, Liquids and Electrolytes, 763. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-540-73735-3_543.

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Gooch, Jan W. "Methyl Cyclohexane." In Encyclopedic Dictionary of Polymers, 457. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7408.

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Wohlfarth, Ch. "Viscosity of cyclohexane." In Supplement to IV/18, 377–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_197.

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Wohlfarth, Christian. "Viscosity of cyclohexane." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 226–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_203.

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Atti di convegni sul tema "Cyclohexane"

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Almeida, Daniel Freire, Anderson Cerqueira dos Santos Silva, Zaíne Baldoino Silva, Zaíne Baldoino Silva, Vanessa Nascimento Monteiro, Ronaldo Costa Santos, and Luiz Antônio Magalhães Pontes. "BENZOTHIOPHENE AND CYCLOHEXANE REACTIONS OVER LA MODIFIED BETA ZEOLITES IN FCC PROCESS." In X Simpósio Internacional de Inovação e Tecnologia, 339–46. São Paulo: Editora Blucher, 2024. https://doi.org/10.5151/siintec2024-393569.

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Sun, H., Z. Fan, L. Dou, C. Zhang, and T. Shao. "Insight into the mechanism of plasma-enabled toluene hydrogenation for methyl-cyclohexane without catalyst." In 2024 IEEE International Conference on Plasma Science (ICOPS), 1. IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10626102.

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Sanni, Olujide, Ogbemi Bukuaghangin, Wassim Taleb, Thibaut Charpentier, Richard Barker, Frederick Pessu, and Anne Neville. "Mechanisms and Polymorphic Transformation of Calcium Carbonate Inorganic Scale in Oil-Water Emulsion." In CONFERENCE 2022, 1–11. AMPP, 2022. https://doi.org/10.5006/c2022-17876.

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ABSTRACT Studying the kinetics of scale formation on the surface and in the bulk of the fluid when the oil phase is present has not yet received much attention. The impact of adding an oil phase to both surface deposition and bulk precipitation is not clear and needs to be studied. This work studies the mechanisms and behavior of precipitation of calcium carbonate scale in the presence of oil - water emulsion. A total of 100ml of different oil fractions including cyclohexane, kerosene, toluene and asphaltene is introduced to a vessel with 1000ml of brine at temperature, T=30°C. Using the Rotating Cylinder Electrode (RCE) technique, the mixture is continuously stirred with an overhead impeller blade at 520 rpm to create homogeneous dispersion in the two-phase mixture. Samples are collected and analyzed using the SEM, XRD and Atomic Absorption Spectroscopy (AAS) techniques to determine the morphology, polymorphic transformation and calcium ion concentration at different time intervals. The study shows that the presence of the different fractions of oil have a pronounced effect, by hindering the formation of calcium carbonate and significantly altering the transformation from the metastable polymorph vaterite to the stable polymorph calcite.

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Sanni, Olujide, and Frederick Pessu. "Impact of Multiphase Flow on the Inhibition of Carbonate Scale Deposition." In CONFERENCE 2023, 1–14. AMPP, 2023. https://doi.org/10.5006/c2023-19425.

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Abstract Several studies aimed at understanding and combating scale formation in the oil and gas industry have been mainly carried out in single phase brine solution, however, for chemical inhibitors to be effectively deployed to mitigate scaling, it is essential to develop an experimental matrix and laboratory tests to assess its effectiveness in the presence of multiphase fluids. The objective of this study is to evaluate the impact of various organic phases in produced fluids on the inhibition efficiency of polyphosphinocarboxylic acid (PPCA) on calcium carbonate scale precipitation Single and multiphase tests were conducted for CaCO3 precipitation at 30 °C. The mixture of CaCO3 brine (SR 211) and oil fractions was continuously stirred with an overhead impeller blade at 520 rpm to create homogeneous dispersion. The oil fractions include 50ml cyclohexane, 30ml kerosene, 20ml toluene and 0.01% asphaltene, fully dispersed in toluene. The substrate (RCE sample) on which surface deposition was assessed is a cylindrical piece of stainless steel (SS 316L) mounted on a shaft rotated at 400rpm by the overhead stirrer. The impact of the multiphase fluids on chemical scale inhibition was investigated with PPCA inhibitors at minimum inhibitor concentration (MIC) determined from the single phase. Bulk samples were taken at different time intervals and analysed by SEM, AAS and XRD to evaluate the precipitation process, size, morphology and kinetics of transformation. The results show an increase in the deposition for the oil-water system containing various organic phases. Under the same condition and duration of test, the MIC required to prevent scale formation in the bulk was shown to vary between the oil-free and the different oil-water systems. These results helps to improve on current understanding of calcium carbonate polymorphs crystallization in the presence of inhibitors.

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Bezborodov, Vladimir, Roman S. Dabrowski, Genadz Sasnouski, V. Lapanik, and Jerzy Dziaduszek. "New LC cyclohexene and cyclohexane derivatives: LC compositions on their base." In XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, edited by Jolanta Rutkowska, Stanislaw J. Klosowicz, and Jerzy Zielinski. SPIE, 2002. http://dx.doi.org/10.1117/12.472203.

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Tykarski, W., Jerzy Dziaduszek, Roman S. Dabrowski, and Vladimir Bezborodov. "Synthesis and mesogenic properties of compounds with lateral substituted cyclohexane and cyclohexene ring." In Liquid Crystals, edited by Marzena Tykarska, Roman S. Dabrowski, and Jerzy Zielinski. SPIE, 1998. http://dx.doi.org/10.1117/12.301314.

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Nagadi, Mahmoud M., та A. A. Naqvi. "Energy resolution measurements of cyclohexane and deuterated-cyclohexane scintillators for monoenergetic γ-rays". У Fifth International Conference on Applications of Nuclear Techniques: Neutrons in Research and Industry, редактор George Vourvopoulos. SPIE, 1997. http://dx.doi.org/10.1117/12.267866.

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Anikeenko, Alexey, Alexandra Kim, and Nikolai Medvedev. "Delaunay Simplexes in Liquid Cyclohexane." In 2009 Sixth International Symposium on Voronoi Diagrams (ISVD). IEEE, 2009. http://dx.doi.org/10.1109/isvd.2009.10.

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Maloney, Thad C., and Hannu Paulapuro. "Thermoporosimetry of Pulp Fibers." In The Science of Papermaking, edited by C. F. Baker. Fundamental Research Committee (FRC), Manchester, 2001. http://dx.doi.org/10.15376/frc.2001.2.897.

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This paper covers the use of thermoporosimetry to measure the pore size distribution (PSD) of pulp fibers. Thermoporosimetry is based on the melting temperature depression of an absorbate in a porous structure. A discreet or “step” melting procedure, rather than the usual continuous method, is used to melt the absorbate. This method eliminates thermal lag and gives the high temperature accuracy required for measuring large pores. Measurement of water-saturated chemical pulp fibers using this technique, combined with solute exclusion, indicates a bimodal distribution of cell wall pores. The interpretation of data from water-saturated fibers is complicated by several factors: 1) distortion of the cell wall by ice crystal growth; 2) the depression of water’s melting temperature by osmotic pressure; and 3) inadequate range to cover the larges pores. One way to correct these problems is by replacing the water with cyclohexane. The major disadvantage of this approach is that the cell wall contracts in cyclohexane and its pore structure may change in other ways which are not understood. Like water, the cyclohexane analysis shows a bimodal distribution of pores. The smaller pores, “micropores”, are less than about 5 nm in diameter, the “macropores” are about 15–700 nm. It was found that there is a quantity of cyclohexane in the cell wall which does not freeze. Analysis of nonfreezing cyclohexane indicates a surface area of about 400 m2/g for kraft pulp. The cyclohexane method is very suitable for studying beating, which primarily involves the opening of larger pores.

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Melker, Alexander I., Dimitri A. Kornilov, Tatiana V. Vorobyeva, and Alexander Ivanov. "Conformational transitions in cyclohexane and benzol." In SPIE Proceedings, edited by Alexander I. Melker. SPIE, 2003. http://dx.doi.org/10.1117/12.517945.

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Rapporti di organizzazioni sul tema "Cyclohexane"

1

Malinauskas, R. A., and C. H. Byers. Droplet formation phenomena in dc electric fields. [Pendant drops of 2 systems, water-air and water-cyclohexane]. Office of Scientific and Technical Information (OSTI), July 1985. http://dx.doi.org/10.2172/5623941.

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2

Osterheld, T. H., M. D. Allendorf, and R. Larson. Gas-phase chemistry during the conversion of cyclohexane to carbon: Flow reactor studies at low and intermediate pressure. Office of Scientific and Technical Information (OSTI), July 1995. http://dx.doi.org/10.2172/83841.

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3

ชวนชื่น, รุ่งทิพย์, พรเพ็ญ พัฒนโสภณ та ศุภชัย เนื้อนวลสุวรรณ. การเฝ้าระวังการดื้อต่อยาฆ่าเชื้อและยาปฏิชีวนะของ Salmonella spp. และ Escherichia coli ในสายพันธุ์ที่แยกได้ในประเทศไทย : รายงานการวิจัย. จุฬาลงกรณ์มหาวิทยาลัย, 2006. https://doi.org/10.58837/chula.res.2006.87.

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แยก Salmonella enterica จำนวน 257 isolates และ Escherichia coli จำนวน 60 isolates จากตัวอย่างที่ได้จาก ไก่ สุกรและสิ่งแวดล้อมในฟาร์ม ทำการหาค่า minimal inhibitory concentration (MIC) ต่อยาปฏิชีวนะและยาฆ่าเชื้อ ได้แก่ ampicillin (AMP) chloramphenicol (CHP) ciprofloxacin (CIP) erythromycin (ERY) gentamycin (GEN) tetracycline (TET) trmethoprim (TRI) benzalkonium chloride (BKC) chlorhexidine (CHX), copper sulfate (CuSO4) และ zinc chloride (ZnCl2) พบว่า salmonella 162 isolates (63.04%) และ E. coli 50 isolates (83.33%) ดื้อต่อยาปฏิชีวนะอย่างน้อยหนึ่งชนิด ค่า MIC ต่อ BKC, CHX, CUSO4 และ ZnCl2 เกาะกันเป็นกลุ่มใหญ่ โดยเชื้อทั้งหมดนี้ไวต่อ cyclohexane และการเติม CCCP ไม่ทำให้ค่า MIC ต่อ BKC และ CHX เปลี่ยนแปลง เมื่อตรวจหาการปรากฏของ ยีน qacE และ qacE[triangle]1 ใน Salmonella ที่มีค่า MIC ต่อ BKC สูงสุดและต่ำสุดจำนวน 127 isolates ไม่พบว่ามีการปรากฏของยีน qacE และพบยีน qacE[triangle]1 ใน 38 isolates (29.92%) ที่อาจอยู่และไม่อยู่บน class I integron เชื้อที่มียีน qacE[triangle]1 ไม่มีค่า MIC ต่อ BKC และยาปฏิชีวนะสูงกว่าเชื้อที่ไม่มียีน qacE[triangle]1นอกจากนี้ Salmonella สามารถถ่ายทอดยีนดื้อยาปฏิชีวนะไปยังแบคทีเรียชนิดอื่นได้ แต่ไม่พบการถ่ายทอดยีนที่ควบคุมการลดความไวต่อ BKC และ CHX การสัมผัส BKC ในระดับต่ำให้ mutant ที่มีค่า MIC ต่อยาฆ่าเชื้อชนิดนี้สูงขึ้นและความไวต่อ CHP และ ERY ลดลง โดยที่ CCCP ทำให้ค่า MIC เปลี่ยนแปลง ผลการวิจัยครั้งนี้แสดงให้เห็นว่า Salmonella และ E. coli ยังไม่พัฒนาการดื้อต่อยาฆ่าเชื้อและโลหะหนักที่ทดสอบ หรือมีการพัฒนาในระดับที่ยังไม่สูงนัก ระบบ AcrAB และระบบ efflux systems อื่นๆ ที่ใช้พลังงานจาก Proton Motif Force (PMF) ไม่มีบทบาทสำคัญต่อการลดความไวต่อ BKC และ CHX การใช้ BKC ในระดับต่ำทำให้เชื้อพัฒนาการดื้อยาข้ามต่อยาปฏิชีวนะได้ ซึ่งสนับสนุนว่าควรมีการวางมาตรการควบคุมการใช้ยาฆ่าเชื้ออย่างสุขุมรอบคอบเช่นกัน

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Pesce-Rodriguez, Rose A., and Stephanie M. Piraino. Characterization of Cyclohexanone Inclusions in Class 1 RDX. Fort Belvoir, VA: Defense Technical Information Center, June 2014. http://dx.doi.org/10.21236/ada602780.

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NIOSH skin notation profile: cyclohexanol. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, October 2020. http://dx.doi.org/10.26616/nioshpub2021101.

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NIOSH skin notation profile: cyclohexanone. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, October 2020. http://dx.doi.org/10.26616/nioshpub2021103.

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