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Journal articles on the topic 'Key words: naphtha'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Girish, M. Deshmukh*, and C. Shende Anand. "Design of Atmospheric Petroleum Distillation Column." Archives of Chemistry and Chemical Engineering 3, no. 1 (2021): 1–10. https://doi.org/10.5281/zenodo.5783274.

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<strong>Abstract</strong> This work summarizes the design procedure for Atmospheric Distillation Column for petroleum oil. The design and operation of crude distillation unit are still done almost on exclusively on an empirical basis. This is because crude petroleum and its products are made of large number of hydro-carbons. The complex mixture due to large number of fractions, side stripper, and reflux made the work of improving energy efficiency into a tedious manner. This creates adversity in designing the distillation column. The varied products are distinguished by performing true boiling

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2

Al Mestneer, Raed, and Carlo Andrea Bollino. "Long-Term Forecasting Models of Oil Demand Emerging from the Global Petrochemical Sector." Energies 17, no. 20 (2024): 5046. http://dx.doi.org/10.3390/en17205046.

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In the global energy mix by 2040, the growth in demand for oil and gas will be predominantly driven by the petrochemical sector across all regions of the world. The strong performance of this industry is anticipated to necessitate additional volumes of key feedstocks. Therefore, understanding the demand dynamics within the petrochemical sector is crucial for policy makers and industry stakeholders to make informed decisions regarding economic diversification, economic planning, and environmental sustainability. However, there is a notable lack of existing literature that explicitly addresses c

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3

Clark, Peter D., Nicholas M. Irvine, and Pratibha Sarkar. "The synthesis of 3H-naphthol[1,8-bc]thiophene derivatives." Canadian Journal of Chemistry 69, no. 6 (1991): 1011–16. http://dx.doi.org/10.1139/v91-148.

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Methods for the synthesis of keto derivatives of the little studied naphtho[1,8-bc]thiophene system have been developed. Using the readily available benzothiophene derivative 6,7-dihydrobenzo[b]thiophen-4(5H)-one 4, a 3-keto-naphtho[1,8-bc]thiophene 14 was synthesized by a tin(IV) chloride catalyzed cyclization of the acid chloride derivative of the saturated acid 13b. The bicyclic ketone 4 was also used to prepare the keto-sulfoxide 7, which was cyclized to the 4-keto-naphtho[1,8-bc]thiophene system 9 in a Pummerer-type rearrangement. Key words: synthesis, organosulfur, naphtho[1,8-bc]thiophe

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4

Ayer, William A., Peter A. Craw, and Koohei Nozawa. "Two 1H-naphtho[2,3-c]pyran-1-one metabolites from the fungus Paecilomyces variotii." Canadian Journal of Chemistry 69, no. 2 (1991): 189–91. http://dx.doi.org/10.1139/v91-030.

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The fungus Paecilomyces variotii Bainier, isolated from larvae of Dendroctonus ponderosa Hopk. (mountain pine beetle), is antagonistic to Ophiostoma clavigerum, the fungus believed responsible for tree mortality caused by blue stain fungi. The metabolites produced by P. variotii when grown in liquid culture have been studied and two new 1H-naphtho[2,3-c]pyran-1-ones related to semi-vioxanthin (4) have been isolated. The structures of these two metabolites, semi-viriditoxin (1) and semi-viriditoxic acid (2), have been determined by chemical and spectroscopic methods. Key words: fungal metabolit

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5

Bakos, J., S. Cserépi-Szucs, Á. Gömöry, C. Hegedüs, L. Markó, and Á. Szöllosy. "Asymmetric hydroformylation of styrene catalyzed by platinum complexes of chiral diphosphites with atropisomeric terminal moieties." Canadian Journal of Chemistry 79, no. 5-6 (2001): 725–30. http://dx.doi.org/10.1139/v01-085.

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To study the nature of steric and electronic effects of diphosphites, a novel diphosphite was synthesized and tested with regard of its catalytic performance in the hydroformylation of styrene catalyzed by platinum complexes. The novel ligand 3 was prepared by the reaction of enantiomerically pure pentane-2,4-diol with (S)-2-chloro-5,5',6,6',7,7',8,8'-octahydro-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine based on H8-BINOL (H8-BINOL = 5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphthol). For a comparative study, the BINOL (1,1'-bi-2-naphthol) based analogue 4 of 3 has also been synthesized. Th

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6

Kropp, Kevin G., and Phillip M. Fedorak. "A review of the occurrence, toxicity,and biodegradation of condensed thiophenes found in petroleum." Canadian Journal of Microbiology 44, no. 7 (1998): 605–22. http://dx.doi.org/10.1139/w98-045.

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Condensed thiophenes comprise a significant portion of the organosulfur compounds in petroleum and in other products from fossil fuels. Dibenzothiophene (DBT) has served as a model compound in biodegradation studies for over two decades. However, until quite recently, few other organosulfur compounds were studied, and their fates in petroleum-contaminated environments are largely unknown. This paper presents a review of the types of organosulfur compounds found in petroleum and summarizes the scant literature on toxicity studies with condensed thiophenes. Reports on the biodegradation of benzo

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7

Shamran Mohammed, Hasan, Atica Sultan, Ziyad T. Al-Khateeb, and Abbas Ali Salih Al-Hamdani. "Synthesis, spectral studies and antioxidant study of metal-coordinated azo-dye of pyridine and its analytical application for spectrophotometric micro-determination of copper(II)." Bulletin of the Chemical Society of Ethiopia 39, no. 7 (2025): 1273–82. https://doi.org/10.4314/bcse.v39i7.4.

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A novel azo dye ligand namely (2-(pyridin-3-yldiazenyl)naphthalen-1-ol (HPYNA), was synthesized by the coupling reaction of diazonium salt of 3-aminopyridine with naphthol. The palladium(II) complex for HPYNA ligand was prepared by reacting palladium(II) ions with the HPYNA ligand. These synthesized compounds were characterized using different techniques, including mass, 1H-NMR, infrared, and UV-Vis spectroscopy. The infrared results show that the azo ligand reacts as a bidentate via the oxygen atom of phenol and nitrogen atom of the azo group. The palladium(II) complex is square-planer with d

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8

Babol, J., and E. J. Squires. "Liver metabolic activities of intact male pigs injected with skatole." Canadian Journal of Animal Science 79, no. 4 (1999): 549–52. http://dx.doi.org/10.4141/a99-025.

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Twelve intact male pigs (101.3 ± 1.8 kg liveweight [LW]) were divided into two groups, with six pigs receiving nine daily i.m. injections of skatole (1 mg kg−1 LW). Enzymatic activities were measured in liver tissues taken at slaughter. These included the rate of phase I skatole metabolism and the rate of glucuronidation and sulphation of 2-naphthol and(or) p-nitrophenol. Fat skatole concentration was higher (P = 0.001) in pigs injected with skatole (0.41 ± 0.04 ppm) than in control pigs (0.10 ± 0.04 ppm); however, enzymatic activities did not differ between the treatments. The results indicat

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9

D., T. Tayade A. B. Wadekar. "TO STUDY THE THERMODYNAMIC PARAMETERS OF 5-p-CHLOROPHENYLTHIOCARBAMIDO-1-NAPHTHOL AT DIFFERENT CONCENTRATIONS AND DIFFERENT TEMPERATURES IN 70% ETHANOL-WATER MEDIA." iajps,csk publications 03, no. 11 (2016): 1376–79. https://doi.org/10.5281/zenodo.205872.

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Conductivity play vital role in drug diffusion. Thermodynamic parameters affected by substituent’s of drug. Thus recently in laboratory, conductometrically have been investigated thermodynamic parameters of 5-pChlorophenylthiocarbamido-1-naphthol [p-CPTCN] or L3 have been studied at different concentrations in 70% ethanol-water mixture at different temperatures. This work highlights investigation of G, K and µ values. The thermodynamic parameters viz. ΔH, ΔS and ∆G for ion pair formation determined from the value of ion association constant at 298K and 303K. This investigation provided valuabl

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10

Chen, Z., W. B. McGill, M. J. Dudas та B. Xing. "α-Naphthol sorption as regulated by structure and composition of organic substances in soils and sediments". Canadian Journal of Soil Science 76, № 4 (1996): 513–22. http://dx.doi.org/10.4141/cjss96-064.

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Humic acids (HAs) from major horizons of a Gleyed Black Chernozem and a set of soil and sediment samples were examined to understand the influence of the structure a composition of organic substances on sorption of organic pollutants. Solid state 13C cross-polarized/magic angle spinning (CP/MAS) NMR results indicated that the aromaticity of HAs increased with soil depth. The aromaticity of organic substances in bulk soils and sediments varied with the degree of geological diagenesis. Sorption experiments showed a linear relationship between the carbon normalized partition coefficient (Koc) of

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11

Souvannavong, Vongthip, Christophe Lemaire, Spencer Brown, and Arlette Adam. "UV irradiation of a B-cell hybridoma increases expression of alkaline phosphatase: involvement in apoptosis." Biochemistry and Cell Biology 75, no. 6 (1997): 783–88. http://dx.doi.org/10.1139/o97-086.

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Expression of alkaline phosphatase (APase) by 7TD1 B-cell hybridoma was amplified by ultraviolet irradiation; cell growth was inhibited and cell death by apoptosis was increased. Irradiation induced high levels of APase activity in cycling as well as in apoptotic cells. In contrast, APase activity faded with time in nonirradiated cells and was no longer expressed in spontaneous apoptotic cells appearing after several days in culture. This was demonstrated by cell morphology, DNA fragmentation, and flow cytometry after simultaneous staining of DNA with Hoechst 33342 and APase with naphthol AS-T

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12

Abd Alrazzak, Nour. "Synthesis of new azo compounds based on 4-aminosalicylic acid and study anti-corrosive activity." Bulletin of the Chemical Society of Ethiopia 38, no. 2 (2024): 473–79. http://dx.doi.org/10.4314/bcse.v38i2.14.

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New azo dyes were prepared from 4-amino-2-hydroxy-benzoic acid in two steps; the first step includes preparation the diazonium salt. Then, diazonium compound coupled with different aromatic compounds containing donating groups (orcinol, 2,6-dimethylphenol, hydroquinone, catechol, 1,2,4-triazole, 2-methyl-naphthol and 4-toluidine, respectively). The physical properties of synthesized compounds were studied like melting point and solubility. The target molecules were characterized using FTIR, NMR and CHNS techniques. The activity of the compounds 1, 3 and 5 as anticorrosion on carbon steel in 0.

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13

Pezacki, John Paul. "Normal acid/base behaviour in proton transfer reactions to alkoxy substituted carbenes: estimates for intrinsic barriers to reaction and pKa values." Canadian Journal of Chemistry 77, no. 7 (1999): 1230–40. http://dx.doi.org/10.1139/v99-087.

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Theoretical Eigen curves can be drawn through Brønsted data for dimethoxycarbene (1), phenyltrimethyl-siloxycarbene (3a), 4-methylphenyl(trimethylsiloxy)carbene (3b), 4-methoxyphenyl(trimethylsiloxy)carbene (3c), and β-naphthyl(trimethylsiloxy)carbene (3d). The Brønsted plots for these data are clearly curved with α values near 1 when proton transfer is thermodynamically unfavourable and α values near 0 when proton transfer is thermodynamically favourable, suggesting that these carbenes behave as "normal" Brønsted bases. Estimates of the intrinsic barriers (ΔG0‡) for proton transfer reactions

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14

Rezaee, Mohammad, and Parisa Tajer-Mohammad-Ghazvini. "Rapid and efficient determination of zinc in water samples by graphite furnace atomic absorption spectrometry after homogeneous liquid-liquid microextraction via flotation assistance." Bulletin of the Chemical Society of Ethiopia 36, no. 1 (2022): 1–11. http://dx.doi.org/10.4314/bcse.v36i1.1.

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ABSTRACT. A new application of homogeneous liquid–liquid microextraction via flotation assistance (HLLME-FA) has been developed for the determination of Zn(II) in the water samples by using graphite furnace atomic absorption spectrometry (GFAAS). 1-(2-Pyridylazo)-2-naphthol (PAN) was used as a chelating reagent. In this work, low density organic solvent was used as an extraction solvent and no centrifugation was required in this method. A special extraction cell was designed to facilitate collection of the low density extraction solvent. The predominant parameters influencing the HLLME-FA proc

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15

Abd Alrazzak, N., S. T. Saad, H. Y. Al-gubury, M. M. Kareem, and M. M. Assi. "Photocatalytic degradation efficiency of azo dye in aqueous phase using different photo catalysts." Bulletin of the Chemical Society of Ethiopia 34, no. 3 (2021): 463–69. http://dx.doi.org/10.4314/bcse.v34i3.3.

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The new azo dye [4-(4-hydroxy-2-methylnaphthyl)diazenyl]benzoic acid was synthesized by the reaction of 2-methyl-1-naphthol with p-amino benzoic acid. The photcatalytic degradation of azo dye has been investigated by using zinc oxide and cadmium sulfide. This degradation was carried out by the irradiation of aqueous suspended solutions containing different concentrations of this dye using 0.11 g/100 mL of metal oxide (semiconductors) ZnO and CdS. A mercury lamp 125 W in a Pyrex photoreaction cell of 100 mL at room temperature was used as an irradiation source. The effect of the catalyst on the

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16

Dilrabo, Norkulova. "COMPOSITION AND PROPERTIES OF NAPHTHA THAT THE MAIN RAW MATERIAL OF THE PETROCHEMICAL INDUSTRY." April 21, 2022. https://doi.org/10.5281/zenodo.6474817.

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 Annotation: Naphtha is e usually classified as light, intermediate and heavy  naphtha. Visbreaking, fluid catalytic cracking, hydrocracking and coking processes  play important role in the way producing naphtha. The given table below illustrates  important characteristics of naphtha fractions from different crudes. The extracted  aromatic  fraction  of  naphtha  can  be  used  in  the  manufacture  of  synthetic  fibers.  Naphtha is a complex mixture of hydrocarbons that two types of analyses are usually

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17

Usenko, T., and V. Shulyak. "Study of acute hematotoxic action of tebuconazole on Wistar Hannover rats." March 30, 2018. https://doi.org/10.5281/zenodo.1239823.

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Usenko T., Shulyak V. Study of acute hematotoxic action of tebuconazole on Wistar Hannover rats. Актуальні проблеми транспортної медицини / Actual problems of transport medicine / 2018;1(51):113-121. ISSN 1818-9385 DOI http://dx.doi.org/10.5281/zenodo.1239823 http://aptm.org.ua     UDК 615.9: 616.15: 615.099 STUDY OF ACUTE HEMATOTOXIC ACTION OF TEBUCONAZOLE ON WISTAR HANNOVER RATS   Usenko T., Shulyak V.   L. I. Medved’s Research Center of Preventive Toxicology, Food and Chemical Safety, Ministry of Health, Ukraine   The aim of the study was to assess the effects

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