Relevant bibliographies by topics / Methanolic solution

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Methanolic solution'

Author: Grafiati
Published: 5 June 2025
Last updated: 15 July 2025

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Journal articles on the topic "Methanolic solution"

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D., P. GHOSH, GUHANlYOGI B., and C. LAHIRI S. "Association Constants of the Complexes between 8-Hydroxyquinolines with Ammonia and Methylamine in 90% Methanol + Water Mixtures." Journal of Indian Chemical Society Vol. 74, Mar 1997 (1997): 191–94. https://doi.org/10.5281/zenodo.5877525.

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Department of Chemistry, TDB Collage, Asansol Department of Chemistry, Kalyani University, Kalyani-741 235 <em>Manuscript received 28 March 1995, revised 29 September 1995, accepted 15 November 1995</em> 8-Hydroxyquinoline (HQ), 5-chloro-7-iodlo-8-hydroxyquinollne (ICHQ) and 5,7-dilodo-8-hydroxyquinoline (I<sub>2</sub>HQ) form stable yellow complexes&nbsp;with NH<sub>3</sub> and CH<sub>3</sub>H<sub>2</sub> at room temperature but decompose above 323 K. The association constants of the complexes at 298 K calculated spectrophotometrically in 90% methanol solution have been found to be fairly high. The stability of the complexes with NH<sub>3</sub> or CH<sub>3</sub>NH<sub>2</sub> are usually In the order, ICHQ &gt; I<sub>2</sub>HQ &gt; HQ.
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Hefny, Mohamed H., Abdullah S. Babaqi, Mohamed S. El-Basiouny, and Ragab M. Abdullah. "Anodic dissolution of zinc in aqueous-methanolic trichloroacetic acid solutions." Collection of Czechoslovak Chemical Communications 56, no. 1 (1991): 236–40. http://dx.doi.org/10.1135/cccc19910236.

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Steady state current-potential curves for the anodic dissolution of zinc in aqueous-methanolic 0.25M trichloracetic acid solutions were constructed for wide ranges of the solution composition and temperature. Analysis of the results reveal that the increase of the water content and rise of temperature of the solution increases the corrosion rate. The most plausible role of the solvent lies within the stabilization of the anodic dissolution reaction products by water molecules. The changes in the properties of the solution due to the presence of methanol which give rise to hindrance of the anodic dissolution reaction are adsorption of methanol, change of viscosity and pH of the solution. These factors seem to be of secondary importance.
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Jorge, F. C., T. M. Santos, J. Pedrosa de Jesus, and W. B. Banks. "Fixation of Chromium in Wood from Trivalent Chromium Salt Solutions." Holzforschung 53, no. 5 (1999): 465–73. http://dx.doi.org/10.1515/hf.1999.077.

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Summary The aim of this study was to fix chromium chemically in wood from trivalent chromium solutions. Chromium(III) nitrate, chloride and sulphate salts were applied, both in aqueous and in methanolic solutions. To improve chromium fixation metallic zinc was used as a strong reductant to generate labile Cr(II) species from Cr(III), and base was added (NaOH for water and NaMeO for methanol). Aqueous solution reaction conditions were always acidic in spite of base addition, leading to unacceptable levels of wood degradation (e. g., weight loss), although relatively high chromium levels were attained in some cases. Methanolic solutions did not lead to wood degradation, and there was fixation of high levels of chromium. Although the addition of NaMeO seemed to improve chromium fixation, a chromium precipitate always formed, usually after a long reaction time (&gt; 4h). Therefore the following experimental conditions for chromium fixation are suggested: alcoholic solution of Cr(III) chloride or nitrate, addition of metallic zinc, at reflux. To avoid using large amounts of zinc, Cr(III)-solutions can also be reduced electrochemically.
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Yuvaraj, P. and John Peter Paul J. "ANALGESIC ACTIVITY OF DICTYOPTERIS AUSTRALIS (SONDER) ASKENASY (BROWN SEAWEED) FROM PAMBAN, RAMANATHAPURAM DISTRICT, TAMIL NADU, INDIA." Indo American Journal of Pharmaceutical Sciences 04, no. 08 (2017): 2534–37. https://doi.org/10.5281/zenodo.848511.

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The present study was aimed to determine the analgesic activity of methanolic extract of Dictyopteris australis (Sonder) Askenasy collected from Pamban, Ramanathapuram District, Tamil Nadu, India. The dried and powdered Dictyopteris australis was extracted in methanol to estimate the analgesic activity. The analgesic activity was assessed on intact rat by tail immersion method. Diclofenac Sodium in the dose of 100mg/kg was used as standard drug. Methanolic extracts of Dictyopteris australis were given in the doses of 200 and 400mg/kg. Control group received normal saline solution. All the doses were given orally. Results explained that both the doses of methanolic extracts of Dictyopteris australis had potent analgesic activity. From the observations, it was concluded that methanolic extract of Dictyopteris australis at 200mg/kg was found to have more effect as compared to 400mg/kg methanolic extract. Key words: Analgesic, Seaweeds, Dictyopteris, Methanolic extract, Pamban.
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Jung, Hee Jin, Hae Ran Park, Uhee Jung, and Sung Kee Jo. "Radiolysis study of genistein in methanolic solution." Radiation Physics and Chemistry 78, no. 6 (2009): 386–93. http://dx.doi.org/10.1016/j.radphyschem.2009.03.004.

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Saalfrank, Rolf W., Roland Harbig, Oliver Struck, Eva-Maria Peters, and Hans Georg von Schnering. "Verknüpfung koordinativ ungesättigter Kupfer(II)-Monomere via Cyano-versus Tetrazolyl-Donor/ Linkage of Coordinatively Unsaturated Copper(II) Monomers via Cyano versus Tetrazolyl Donor." Zeitschrift für Naturforschung B 51, no. 3 (1996): 399–408. http://dx.doi.org/10.1515/znb-1996-0316.

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Abstract Reaction of a methanolic copper(II) acetate solution with tetrazolyl enol derivatives 2a (HL2) or 2b (HL3) leads to the formation of the corresponding 2D-coordination polymers 4 (∞2 [CuL22]) and 5 (∞2 [CuL23]), respectively. Single-crystal X-ray diffraction of the supramolecular species 4 and 5 established unequivocally the structures of the regioisomeric coordination polymers. On the contrary, reactions of 2c (HL4) with methanolic copper(II) acetate solution and 2b (HL3) with methanolic zinc(II) acetate solution yield mononuclear chelate complexes 11 ([CuL42]) and 12 ([ZnL23(MeOH)2]). The structures of 11 and 12 have been established by X-ray structure analysis.
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G., BHATTACHARJEE, K. SINGH A., and SAIKIA R. "Kinetics of the Reaction of 2,3-[3-Norcaren-endo-2,5-diyl]-N-(2',4'-dinitrophenoxy)succinimide with Hydroxide lon, Piperidine, Morpholine and Cyclohexylamine. Base Catalysis with Hydroxide lon and Piperidine." Journal of Indian Chemical Society Vol. 68, Jul 1991 (1991): 407–8. https://doi.org/10.5281/zenodo.6158026.

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Department of Chemistry, University of Roorkee, Roorkee-247 667 <em>Manuscript received 19 February 1990, revised 17 June 1991, accepted 26 June 1991</em> Kinetics of the Reaction of 2,3-[3-Norcaren-<em>endo</em>-2,5-diyl]-<em>N</em>-(2&#39;,4&#39;-dinitrophenoxy)succinimide with Hydroxide lon, Piperidine, Morpholine and Cyclohexylamine. Base Catalysis with Hydroxide lon and Piperidine.
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Bhusan Sahoo, Himanshu, Rakesh Sagar, Subrat Kumar Bhattamisra, and Amrita Bhaiji. "Preliminary study on the impact of methanolic extract of Elephantopus scaber Linn. on hair growth promoting effect in rats." Herba Polonica 59, no. 2 (2013): 35–45. http://dx.doi.org/10.2478/hepo-2013-0010.

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Summary Methanolic extract of Elephantopus scaber leaves was investigated for its role in hair growth in experimental rats. The 2% and 5% solution of prepared formulation using methanolic extract was studied for hair growth on wistar rats for 30 days. Minoxidil (2% solution) was taken as a reference standard. The prepared hair oil formulation of methanolic extract significantly (p&lt;0.01) potentiated the hair growth initiation and completion time with dosedependent improvement in skin biopsy, hair length and hair weight. In vitro hair follicles development study showed the significant (p&lt;0.05) improvement in the initiation of new hair follicles. Above mentioned results indicated that the methanolic extract of E. scaber rendered significant hair growth promotive effect
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Kharat, Amol R., Farooqui Zakerab, and Kiran Ramesh Kharat. "Free Radical Scavenging Potential of Mentha arvensis of South Gujarat: Evidence from In-vitro Assay." Journal of Drug Delivery and Therapeutics 9, no. 3 (2019): 263–68. http://dx.doi.org/10.22270/jddt.v9i3.2866.

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Present work was undertaken to evaluate efficacy of aqueous and methanol extracts Mentha arvensis leaves as free radical scavenger. The free radical scavenging activity was evaluated by nitric oxide scavenging method, hydrogen peroxide scavenging method and ferric thiocyanate method. The result of the studies was compared with the standard solution of Ascorbic Acid (Vitamin C) treated with same reagent. The results of all the studies showed significant free radical scavenging activity in both aqueous and methanolic extracts of Mentha arvensis and methanolic extract showed the highest free radical scavenging potential than aqueous extract. Keywords: Free radical, Mentha arvensis, Nitric oxide, Hydrogen peroxide, ferric thiocyanate
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Saalfrank, Rolf W., Roland Harbig, Oliver Struck, et al. "Eindimensionale Kupfer(II)-Koordinationspolymere: Kristall-Engineering durch variable Verknüpfungsmuster [1] / One Dimensional Copper(II) Coordination Polymers: Crystal Engineering through Variable Types of Linkage [1]." Zeitschrift für Naturforschung B 52, no. 1 (1997): 125–34. http://dx.doi.org/10.1515/znb-1997-0124.

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Reaction of a methanolic copper(II) acetate solution with tetrazolyl enol derivatives 2a or 2b leads to the formation of the corresponding lD-coordination polymer 1∞[CuL2] 3a and pseudo 1D-coordination polymer [CuL2]2 3b, respectively. On the contrary, reaction of 2c with methanolic copper(II) acetate solution yields OH-bridged 1D-coordination polymer 1∞[CuL2(MeOH)2 3c. Single-crystal X-ray diffraction of the supramolecular species 3 established unequivocally the structures of the stairlike coordination compounds. Reaction of a methanolic copper(II) acetate solution with amidotetrazole derivative 6 leads to the formation of the lD-coordination polymer 1∞ [CuL2] 7. The structure of 7 has been established by X-ray structure analysis
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Dissertations / Theses on the topic "Methanolic solution"

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Whillock, G. O. H. "The corrosion and repassivation of metals in methanolic solutions." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382330.

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Powell, David Hugh. "The structure of solutions of simple electrolytes in water and methanol." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330038.

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Chatterjee, Amritendu. "Solution properties of sodium carboxymethylcellulose in methanol-water mixed solvent media." Thesis, University of North Bengal, 2012. http://hdl.handle.net/123456789/1573.

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Magolan, Kathleen M. "Analysis of methanol, ethanol and propanol in aqueous environmental matrices /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/magolank/kathleenmagolan.pdf.

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Hafiz, Leila. "Préparation des zéolithes hiérarchiques par traitement dans des solutions aqueuses de fluorure." Caen, 2016. http://www.theses.fr/2016CAEN2061.

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Les zéolites ont de nombreuses applications dans l'industrie chimique et pétrochimique en tant que catalyseurs et adsorbants en raison de leurs canaux réguliers et des cavités avec des tailles inférieures à 2 nm, de grandes surfaces, une forte acidité, et une sélectivité de forme. Cependant, l'inconvénient est que l'absorption et le rendement catalytique de zeolites est souvent compromise en raison du fait que les réactifs et les produits peuvent être confrontés à de graves limitations de la diffusion intra-pores. Par conséquent, une variété d'approches ont été conçues afin de réduire les restrictions de diffusion et d'améliorer les performances des zéolites. Les méthodes les plus couramment utilisées sont la diminution de la taille des particules des cristaux de zéolite, et l'introduction d'un réseau secondaire de grands pores (mésopores) reliés aux micropores natifs. Dans la présente étude, nous montrons comment la gravure du fluorure contrôlé conduit à une compréhension claire des propriétés structurelles intrinsèques des cristaux de zéolite mordénite, et le rôle central de la structure cristalline dans le développement de matériaux avancés hiérarchiques. La désalkylation du 1,3,5 triisopropylbenzène est choisi pour mettre en évidence les effets catalytiques de gravure de fluorure sur la zéolithe mordénite et plus particulièrement sur sa surface externe. En outre, la gravure de fluorure sur la zéolite L et bêta ont été réalisées. Nous avons évalué les performances catalytiques de la zéolite bêta et sa version bêta hiérarchique correspondant traité avec NH4F en termes de capacité de conversion, et le temps de vie à des conversions élevées de méthanol-to-Olefins<br>Zeolites have wide applications in chemical and petrochemical industry as catalysts and sorbents due to their regular channels and cavities with sizes below 2 nm, large surface areas, strong acidity, and shape selectivity. The downside however, is that the sorption and catalytic performance of zeolites is often compromised due to the fact that the reactants and products may face severe intra-pore diffusion limitations. Consequently, a variety of approaches have been designed in order to lower these diffusion restrictions and improve the performance of zeolites. The most commonly used approaches are decreasing the particle size of zeolite crystals, and the introduction of a secondary network of large pores (mesopores) connected to the native micropores. In the present study, we show how the controlled fluoride etching leads to a clear understanding of the intrinsic structural properties of mordenite zeolite crystals, and the central role of crystal structure in developing advanced hierarchical materials. The dealkylation of 1,3,5 Triisopropylbenzene is selected to highlight the catalytic effects of fluoride etching on the mordenite zeolite and specifically on its external surface. In addition, fluoride etching on zeolite L and beta were carried out. We evaluated the catalytic performance of zeolite beta and its corresponding hierarchical beta treated with NH4F in terms of conversion capacity, and life time at high conversions of Methanol-to-Olefins
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Holuszko, Maria Ewelina. "Wettability and floatability of coal macerals as derived from flotations in methanol solutions." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29972.

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In this study wettability and floatability of coal petrographic components were examined using the concept of critical surface tension. Two techniques were studied; film flotation and small-scale flotation tests. Both tests use Zisman’s concept of critical surface tension of solids. In these tests particles are separated according to their respective critical surface tension of wettability (film flotation) or critical surface tension of floatability (small-scale flotation). Surface heterogeneity of coal particles arises from the chemical composition of coal surface. The coal macerals are known to have different chemical composition and surface properties. Surface properties of macerals and their flotation response have usually been evaluated with the contact angle or direct flotation tests. In this study, the estimation of surface properties of coal macerals was accomplished by studying their critical surface tension of wettability and floatability. The wettability distributions of coal samples of various petrographic composition were obtained from film flotation. Wettability of petrographic components was evaluated in terms of an average critical surface tension of wettability. In small-scale flotation experiments, coal particles were separated according to their critical surface tension of floatability. Differences in floatability and wettability distributions of coal lithotypes and maceral concentrates are discussed. Microscopic examination of the products from film and small-scale flotations was used to further study the effect of coal petrographic composition on the wettability and floatability.<br>Applied Science, Faculty of<br>Mining Engineering, Keevil Institute of<br>Graduate
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Gatewood, Marena Dessette. "Solubility and recovery of L-isoleucine from high pH solutions and the cause for L-serine habit differences when crystallized from water and methanol/water solutions." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/10916.

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Zhang, Zhaoxi. "A study of solute-solvent interactions in methanol solutions : potential new sustainable technologies for refinery product upgrading/separating and methanol utilization." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:c01e67d6-ed58-4c7c-8913-00f3e0a6408c.

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The upgrading of fluid catalytic cracking (FCC) gasoline is a significant refinery process which is required to decrease FCC gasoline's alkenes and organosulfur compounds (OSCs) levels to meet stringent, regulated specifications, whilst maintaining or increasing the octane number. The separation and recovery of alkene contents in gaseous alkene and alkane mixtures produced in the refining process is presently a substantial consumer of both energy and resources. The current processes for these upgrading or separation processes rely heavily upon energy - intensive technologies which require severe conditions and complex procedures, involving the widespread use of hydrogen. In this research, I explore new routes, based on novel and innovative chemistry, to improve the considerable energy consumption and overcome the above disadvantages in current FCC gasoline upgrading and gaseous alkene and alkane separation, and to develop lower cost, less energy-intensive approaches to these significant challenges. The potentially sustainable chemical - methanol - was introduced as the key to fulfil the aim of this research. After studying the microscopic nature of the hydrogen bond interactions between methanol and various hydrocarbons, alternative green and sustainable methanol-based "Extractive Refining/Extractive Distillation" approaches for upgrading the FCC gasoline/separating gaseous alkene and alkane has been developed to replace the conventional processes. In addition, what we define as the lower phase mixtures (LPMs) derived from the "Extractive Refining" processes were themselves utilised as feedstocks in a subsequent catalytic conversion process to yield high quality liquid fuel and other products. Through these processes the LPMs is able to be efficiently converted into high added value products such as gasoline, benzene, toluene, xylenes (BTX) etc. The feasibilities, mechanisms and advantages of these approaches and processes form the detailed investigations reported in this thesis. At the heart of these new processes is the fundamental issue of hydrogen bond formation between the extractant solvent, methanol, and the primary constituents of FCC gasoline, that need to be extracted, namely light alkenes and organic sulphur compounds, for the latter, typically taken as thiophene in this investigation . The work progresses from the discovery and evaluation of the applied "Extractive Refining/Extractive Distillation" process in FCC gasoline, back through to the fundamental nature, and investigation of the hydrogen bond between solute and solvent, through a variety of physicochemical techniques.
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Jalil, Pour Kivi Soghra. "The Effect of Metal Solution Contaminants on the Electro-catalyst Activities of Direct Methanol Fuel Cell." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38807.

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Direct methanol fuel cells (DMFCs) are considered a clean source of electrical power for future energy demand, creating a potential to reduce our dependency on fossil fuels. Despite their advantages, including high energy density, efficiency and easy handling and distribution of fuel, the commercialization of DMFCs has suffered from some drawbacks, including methanol crossover and contamination of the system. Metal cation contaminants (such as Ni, Co, etc) introduced through the degradation of fuel cell components (bipolar plate and electro-catalyst layer) can significantly affect the Nafion-membrane properties and overall fuel cell performance. In the current study, a systematic approach is taken to characterize and identify the mechanism of the effect of metal solution contaminants on the activities of electro-catalysts of DMFCs. Cyclic voltammetry and rotating disk electrode (RDE) techniques were utilized in order to characterize the effect of various concentrations (i.e., 2x10-x M (x=1-7)) of six metal solution contaminants (i.e., Co, Ni and Zn with sulfate and nitrate as counter-anions) on the voltammetric properties and electro-catalytic activity of polycrystalline Pt during methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). The results showed a decrease in the MOR and ORR activities of Pt as the concentration of metal solution increased. The effect of counter-anion on the Pt activity was further investigated. The results showed that a combined effect of counter-anions and metal cations may be responsible for the decrease in the electro-catalytic activity of Pt. The effect of metal solution contaminants on the Nafion-ionomer of anode electro-catalysts was investigated using Nafion-coated Pt electrode. Voltammetric properties and MOR activities of Nafion-coated and bare Pt electrodes in the presence of Ni solution contaminants were characterized using cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The overall results showed a significant negative effect of Ni solution contaminants on the electro-catalytic activity of bare Pt electrode as compared to the Nafion-coated Pt electrode. Based on the results, it appears that Nafion-ionomer film may interact with metal cations (through its sulfonate groups) and repel them away from the Pt active sites, partially inhibiting the negative effect of metal cations on the Pt activity of Nafion-coated Pt electrode. The effect of metal solution contaminants on the carbon-supported platinum nanoparticle (Pt/C) with various Nafion-ionomer distributions and contents (i.e., Nafion-incorporated Pt/C and Nafion-coated Pt/C electrodes) was further investigated. Cyclic voltammetry and EIS techniques were employed to characterize the effect of Ni solution contaminants on the voltammetric properties and MOR activities of Nafion-incorporated and Nafion-coated Pt/C electrodes. The overall results showed a stronger negative effect of Ni solution contaminants on the electro-catalytic activity of Nafion-incorporated Pt/C electrodes as compared to the Nafion-coated Pt/C electrodes. This further confirms previous observations showing the sulfonate groups of Nafion-ionomer film may attract the Ni metal cations, localize them away from the Pt active sites, and subsequently suppress the negative effect of cations on the activity of Nafion-coated Pt/C electrodes.
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Morel-Desrosiers, Nicole. "Contribution a la thermodynamique des solutions de cryptates alcalins et alcalino-terreux dans l'eau et le methanol." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2E374.

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Etude de la solvatation des especes resultant de l'inclusion d'un cation metallique dans la cavite d'un coordinat macrobicyclique, par la mesure des parametres thermodynamiques. Specificite des differents complexes du 222
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Books on the topic "Methanolic solution"

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Paone, Sergio. Picosecond rotational relaxation of cresyl violet in methanolic electrolyte solutions. 1985.

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Authority, Civil Aviation. Carriage of methanol solution (UN1992) on commercial air transport or public transport aircraft within the United Kingdom (CAA Reference No. 018642). Stationery Office, The, 2012.

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Civil Aviation Authority. Carriage of Methanol Solution (UN1230) on Commercial Air Transport or Public Transport Aircraft Within the United Kingdom (CAA Reference No. 018724). Stationery Office, The, 2012.

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Book chapters on the topic "Methanolic solution"

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Wohlfarth, Ch. "Vapor-liquid equilibrium data of polystyrene in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_379.

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Wohlfarth, Ch. "pVT data of poly(propylene glycol) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_121.

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Wohlfarth, Ch. "pVT data of poly(vinyl acetate) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_140.

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Wohlfarth, Ch. "pVT data of poly(ethylene glycol) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_60.

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Wohlfarth, Ch. "Vapor-liquid equilibrium data of poly(isobutylene) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_276.

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Wohlfarth, Ch. "Enthalpy of dilution of poly(ethylene glycol) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_783.

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Wohlfarth, Ch. "pVT data of poly(ethylene glycol) methacrylate in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_80.

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Wohlfarth, Ch. "Enthalpy of dilution of poly(propylene glycol) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_824.

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Wohlfarth, Ch. "Enthalpy of dilution of poly(vinyl acetate) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_843.

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Wohlfarth, Ch. "Vapor-liquid equilibrium data of poly(butyl methacrylate) in methanol." In Polymer Solutions. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_107.

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Conference papers on the topic "Methanolic solution"

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Schutz, R. W., J. M. Horrigan, and T. A. Bednarowicz. "Stress Corrosion Behavior of Ru-Enhanced Alpha-Beta Titanium Alloys in Methanol Solutions." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98261.

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Abstract Conservative, practical guidelines for the minimum water content required to prevent methanolic stress corrosion cracking (SCC) of Ti-6Al-4V-Ru and Ti-3Al-2.5V-Ru alloy tubulars have been developed from slow strain rate testing in plain and acidified NaCl-saturated methanol-water solutions at 25°C. A minimum methanol water content of 10 wt.% is proposed for Ti-6Al-4V-Ru, whereas 2-3 wt.% is sufficient for the lower strength Ti-3Al-2.5V-Ru alloy. Although HCl-acidification aggravated methanolic SCC, intermixing of methanol with crude oil or pure hydrocarbons, H2S gas saturation, and/or increasing temperature diminished cracking susceptibility in these alloy tubulars.
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Siegmund, G., G. Schmitt, and B. Sadlowsky. "Corrosivity of Methanolic Systems in Wet Sour Gas Production." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00163.

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Abstract During start-up of sour gas wells methanol is added in order to prevent hydrate formation in the piping. Earlier own results and literature data showed, that SSC is likely to occur at carbon steel if methanol is present in sour wet media. Therefore, the SSC risk of pipeline steel in methanol and aqueous methanolic solutions was tested with tensile probes under 16 bar H2S and 16 bar H2S + 8 bar CO2. In the absence of corrosion inhibitors the steel suffered severe SSC which, however, could be prevented with selected corrosion inhibitors. The oxgen contained in the technical grade methanol used in the experiment, but also in the service, increases the corrosion severity of the methanolic systems significantly.
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Ramgopal, T., and S. Amancherla. "Role of Methanol on Pitting of SS316 - Preliminary Results." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04240.

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Abstract Localized corrosion of stainless steel particularly SS316 is not totally understood in aqueous systems. However, localized corrosion of SS 316 in non-aqueous solutions is even less understood or explained. The present effort is aimed at developing an understanding of localized corrosion of stainless steel in methanolic solutions. Potentiodynamic polarization curves on SS316 were performed in methanol-water-1M LiCl at different methanol concentrations ranging from (0 - 99 wt%). The pitting potential decreased from +350 mV SCE to -100 mV SCE as the concentration of methanol increased from 0 wt% to 99 wt%. Dissolution kinetics were determined as a function of methanol concentration from 0 wt% to 90 wt%, in a saturated pit environment. The overvoltage for active dissolution decreased with decreasing methanol (increasing water) content. This however, doesn’t explain the decrease in pitting potential with increasing methanol content. Repassivation transients were determined by pulsing the potential to -150 mV SCE at different concentrations of methanol. The time to repassivate increases with increasing methanol content, suggesting that the critical concentration for repassivation decreases with methanol content. This may indicate that pit growth is stabilized at lower concentration of metal ions with increasing methanol (decreasing water) content. The decrease in critical concentration for repassivation explains the decrease in pitting potential with increasing methanol (decreasing water) content.
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Shintani, D., T. Fukutsuka, Y. Matsuo, Y. Sugie, and T. Ishida. "Passivation Films Behavior of Stainless Steel under High Temperature and Pressure Anhydrous Methanol Solution Containing Chloride." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08431.

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Abstract The corrosion of 316L stainless steel was examined in a high-temperature and high-pressure methanol solution containing chloride ions as decomposition system reactor material using subcritical or supercritical methanol. Surface morphology of corrosion reactions on the sample immersed in a deaerated or aerated anhydrous methanol solution containing 0.53 wt% LiCl at 323 - 473 K were observed. Below 423 K, pitting corrosion was observed in all methanol solutions. On the other hand, at 473 K, pitting corrosion was not observed in spite of higher temperature. The results of electrochemical impedance spectroscopy and cathodic polarization measurements in deaerated methanol solution revealed that the cathode reaction was reduction of proton derived from the dissociation of methanol at high temperature and that the nature of the passive film varied during immersion in the methanol solution. Based on the result of XPS C1s spectra, it is suggested that passive film formed in the methanol solution was composed of the decomposition products of methanol.
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Brossia, C. S., L. A. Pawlick, and R. G. Kelly. "Corrosion of Iron and Aluminum in Methanol Solutions." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95376.

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Abstract With greater pressures to decrease automotive exhaust emissions, alternatives fuels to gasoline are being investigated, one of which is methanol. However, the electrochemical and corrosion behavior of metals in non-aqueous environments has received relatively little attention compared to the behavior of metals in aqueous environments. The objective of this work was to systematically determine the effects of solution species (water, acid, chloride, sulfate) on the electrochemical and corrosion behavior of aluminum 5052 and pure iron in methanol solutions. Acid was found to increase both the open circuit potential and the corrosion current density of both AA5052 and iron. Additionally, acid was found to decrease the pitting potential of AA5052. The addition of Cl- to methanol resulted in decreasing the pitting potential of both AA5052 and iron. Sulfate additions were found to have no first-order effects. The addition of water to methanol tended to decrease the corrosion current density for both metals, with iron showing the most dramatic effect. The addition of water, though, also resulted in decreasing the pitting potential of AA5052.
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Liu, J., Y. Xin, and B. Sun. "Characteristics of hydrogen produced by bipolar pulsed discharge in methanol solution." In 2024 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10626207.

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Schutz, R. W., and M. Xiao. "Stress Corrosion Behavior of Ti-38644 Titanium Alloy Products in Methanol Solutions." In CORROSION 1993. NACE International, 1993. https://doi.org/10.5006/c1993-93148.

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Abstract Minimum water content values required for inhibition of SCC in methanol liquid and vapor have been identified for typical oilfield/offshore Ti-38644 products. These values, ranging between 1.5 and 10 wt.%, are shown to be highly dependent on product metallurgy and composition, temperature, stress level, and SCC test method. Galvanic coupling and sample surface condition only influenced these values in special cases. Increased microstructural refinement and test temperature both markedly decreased minimum water levels (i.e. decreased SCC susceptibility). Continued slow plastic straining (i.e., SSRT) produced worst-case, very conservative results compared to sustained load test methods. Depending on Ti-38644 alloy component design and exposure criteria, a minimum water content of 5 or 10 wt.% in methanol is suggested, based on the 25°C results. These guidelines are consistent with commercial methanol grades used to dissolve hydrates downhole or in offshore systems.
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Farina, S. B., G. S. Duffo, and J. R. Galvele. "Stress Corrosion Cracking of H.C.P. Metals and Alloys in Iodine-Methanol Solutions." In CORROSION 2003. NACE International, 2003. https://doi.org/10.5006/c2003-03536.

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Abstract The stress corrosion cracking (SCC) susceptibility of h.c.p, metals was studied. The alloys used were: zirconium (UNS R60702), Zircaloy-4 (UNS R60804) and titanium (UNS R50400). The studies were performed in a 10 g/L iodine-methanol solution. SCC was observed in all the systems studied, which was always preceded by intergranular attack. It was found that the rate-controlling step of the intergranular propagation was the diffusion of iodine to the tip of the crack. It is not clear if the mechanism of the intergranular attack is due to some sort of chemical attack of the disrupted atomic structure along the grain boundaries, or to the anodic dissolution of an unidentified species segregated along the grain boundaries. After the intergranular penetration reached a certain value, a transition to transgranular cracking mode took place. The length of intergranular attack as a function of time was measured using interrupted strain rate tests. From these data and the overall (Intergranular + Transgranular) crack propagation rate, the rate for transgranular cracking was evaluated. It was concluded that the transgranular part of the cracking was the real SCC process. When analyzed this part of the process, it was found that the crack velocities measured agreed with the predictions of the surface mobility-SCC mechanism. In the systems studied in the present work, the species responsible for inducing SCC are believed to be titanium tetraiodide (TiI4) and zirconium tetraiodide (ZrI4) for titanium and zirconium alloys respectively.
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Esaklul, Khlefa A., John D. Alkire, and Howard R. Bennett. "Inhibitor Testing for Wet Gas Pipelines." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94329.

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Abstract A laboratory inhibitor selection study for a newly developed sweet gas field was conducted. Six inhibitors were screened using static autoclave tests at simulated worst case field conditions of 3.4 bar (50 psi) CO2 partial pressure at 77° C (170° F) in 10% and 33% methanol/water solutions. Three inhibitors exhibited an inhibition efficiency of over 85% and were selected for further testing in a flow loop capable of producing two phase flow. The performance of the inhibitors revealed that static tests are not sufficient to qualify inhibitors. While static tests showed excellent inhibition efficiency, flow loop tests revealed less than optimum performance. Two experimental cautions are noted: solution saturation or sample passivation may affect weight loss measurements and produce incorrect data and methanol/NaCl environments induce pitting. Pitting only occurred under dynamic flow in tests longer than 120 hours. Only two inhibitors were effective in preventing pitting with one showing optimum persistency behavior. Electrochemical monitoring of corrosion tests is essential to the understanding of corrosion variation with time and performance of inhibitors. This paper focuses on inhibitor evaluation techniques and not on inhibitor selection.
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Dougherty, J. A. "Effect of Treatment Method on Corrosion Inhibitor Performance." In CORROSION 1997. NACE International, 1997. https://doi.org/10.5006/c1997-97344.

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Abstract Two types of corrosion inhibitors are studied in laboratory tests simulating batch and continuous treatment methods. Type I is an inhibitor which is adsorbed on the corrosion product layer and forms an inhibitor film. Type II reacts with the corrosion product layer to form a protective film. With both inhibitors, the protection offered by continuous treatment at 100 to 1000 ppm inhibitor compares favorably with batch treatment using neat or 10% solutions of inhibitor. The results show batch treatment of gas phase and liquid phase coupons with a 50% solution of Type I inhibitor gives optimum protection. The treatment gave 91% protection on the liquid phase coupons and only 70% protection on the gas phase coupons, indicating the gas phase coupons are more difficult to inhibit. Batch treatment with neat Type II inhibitor gave better protection than treatment with 10% solutions of the inhibitor in methanol, crude oil or resid oil. The Type II inhibitor at 100 ppm in a continuous application gave as much protection as batch treatment with neat or 10% solutions of the inhibitor in solvents.
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Reports on the topic "Methanolic solution"

1

Tzeng, Yonhua. Hot-Filament Assisted Deposition of Diamond in the Vapor of Methanol-Based Liquid Solutions. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada378594.

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Soucy, G., B. Farnand, and H. Sawatzky. Separation of dilute methanol, MTBE or TAME, 2-methyl-2-butene in pentane-toluene solutions by reverse osmosis. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/302586.

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Larrea Basterra, Macarena, and Jokin Txapartegi Trigueros. The potential of the port of Bilbao in hydrogen transport. Universidad de Deusto, 2025. https://doi.org/10.18543/qpym4409.

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In the context of decarbonization, green hydrogen (H2) could play a relevant role alongside electrification in meeting the energy needs of those activities that require high temperatures and great flexibility with no other alternatives currently available. However, it faces significant obstacles to its large-scale and commercial use due to its storage and transport limitations, low volumetric and energy density, and flammable nature. There are various solutions or hydrogen carriers for its transport and storage, which depend, among others, on the end use. Among the different carrier alternatives, this study delves into the transport and storage cases of H2, such as ammonia, synthetic fuels, liquid hydrogen, metal hydrides, methanol, and liquid organic hydrogen carriers (LOHC). This work aims to provide an overview of the potential of the port of Bilbao as a maritime logistics hub for the (renewable) hydrogen value chain and to contrast the most viable options or carriers to do so.
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