Relevant bibliographies by topics / Acidic fraction

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Acidic fraction'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Acidic fraction"

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Wiyono, Bambang, Sanro Tachibana, and Tinambunan Djaban. "CHEMICAL COMPOSITIONS OF PINE RESIN, ROSIN AND TURPENTINE OIL FROM WEST JAVA." JOURNAL OF FORESTRY RESEARCH 3, no. 1 (2006): 7–17. https://doi.org/10.20886/ijfr.2006.3.1.7-17.

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  This study was conducted to identify chemical composition of merkus pine resin, rosin and turpentine oil. Initially, pine resin was separated into neutral and acidic fractions with an aqueous 4% sodium hydroxide solution. After methylation, the fraction containing turpentine oil and rosin were analyzed by gas chromatography (GC), and gas chromatograph mass spectrometry (GC-MS), respectively. The neutral fraction of pine resin and turpentine oil mainly consisted of a-pinene, D-3-carene and b-pinene. Based on mass spectral comparison, the major constituents of the acidic fraction and rosi
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WARAHAPSARI, FATIMAH AYU, GANIS LUKMANDARU, MASENDRA, and ANDRIAN FERNANDES. "SHORT NOTES: A CHEMOTAXONOMIC STUDY OF THE RESINS FROM THREE DIPTEROCARP SPECIES (Shorea macrophylla, Shorea pinanga, and Shorea hopeifolia)." Wood Research 68, no. 3 (2023): 592–99. http://dx.doi.org/10.37763/wr.1336-4561/68.3.592599.

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A chemotaxonomic study on the resins of Shorea macrophylla, Shorea pinanga, and Shorea hopeifolia was conducted. The dichloromethane extracts were separated into neutral and acidic fractions and then analyzed using GC-MS. The neutral fraction analysis revealed that spathulenol, caryophyllene oxide, aromadendrene oxide, and isoaromadendrene epoxide were the major constituents in all three species. Furthermore, the main compound in the neutral fraction of Shorea hopeifolia was isocaryophyllene which was undetected in the other two species. The major constituent of the acidic fraction of the thre
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Huseynova, B. A., N. F. Gafarova, and E. A. Bekhmetova. "Study of acidic oxygen-containing and nitrogenous compounds isolated from 150–350 °C fraction of deep-water Gunashli field oil." Azerbaijan Oil Industry, no. 10 (October 15, 2020): 51–53. http://dx.doi.org/10.37474/0365-8554/2020-10-51-53.

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The article presents the results of studies on the structural-group composition of acidic oxygen-containing and nitrogenous compounds isolated from the 150–350 oC fraction of the deep-water oil of Gunashli field. The oil is light, low sulfur, paraffinic, rich in light fractions, the acid number is 1.01 mg KOH/g, the total content of acidic oxygen-containing compounds is 0.17 %, and total nitrogen is 0.11 % by weight. The acid number of the 150–350 oC fraction from the same oil is 242.3 mg KOH/g. Acidic oxygen-containing compounds isolated from this fraction with a yield of 0.19 %, nitrogen-con
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S. Raju, T. "Polysaccharidecomponents of the water‐soluble mucilage from the bark of thesilk cotton or kapok tree (Ceiba pentandra var. indica)." Biotechnology and Applied Biochemistry 25, no. 3 (1997): 217–21. http://dx.doi.org/10.1111/j.1470-8744.1997.tb00435.x.

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The mucilaginous polysaccharide complex isolated from the bark of the silk cotton or kapok tree (Ceiba pentandra var. indica) upon delignification followed by graded Cetavlon and ethanol precipitation afforded acidic and neutral polysaccharide fractions which were further purified by ion‐exchange chromatography. The acidic fractions contained two structurally similar glucuronorhamnogalacturonans with different physical properties [Raju, Gowda and Anjaneyalu (1989) Carbohydr. Res. 191, 321Ő332]. The neutral polysaccharide fraction was further fractionated by DMSO into DMSO‐soluble and DMSO‐inso
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Vriesmann, Lúcia Cristina, Carmen Lúcia de Oliveira Petkowicz, Paulo Irajara Borba Carneiro, Maria Eugênia Costa, and Eliana Beleski-Carneiro. "Acidic polysaccharides from Psidium cattleianum (Araçá)." Brazilian Archives of Biology and Technology 52, no. 2 (2009): 259–64. http://dx.doi.org/10.1590/s1516-89132009000200001.

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The aim of this work was to study the acidic polysaccharides of Psidium cattleianum. Pectic fractions were obtained by successive extractions with water, EDTA and sodium carbonate (4 and 25ºC). Monosaccharide composition, total carbohydrates, uronic acids and protein contents were determined for each fraction. The yield of water and EDTA-soluble fractions and high content of uronic acid were consistent with the presence of pectins probably arising from the middle lamellae. On the other hand, sodium carbonate-soluble pectins had a higher neutral sugar content, indicating highly branched polysac
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Nahar, Nilufar, AKM Ahsan Habib, SM Mizanur Rahman, and Tofail Ahmed Chowdhury. "Structure Elucidation of Soluble Dietary Fiber from Cauliflower." Dhaka University Journal of Science 64, no. 1 (2016): 83–88. http://dx.doi.org/10.3329/dujs.v64i1.28529.

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Arabinogalactan and rhamnogalactglucuronan were isolated from soluble dietary fiber (SDF) of cauliflower. The isolated SDF was fractioned into neutral and acidic parts by ion-exchange column chromatography using DEAESepharose Cl-6B gel. Structure elucidation of the isolated SDF polysaccharides were determined sugar analysis, 1HNMR, H-H COSY and TOCSY spectroscopic studies. Neutral fraction of cauliflower was found to be composed of galactose, arabinose and rhamnose whereas the acidic part was found to contain rhamnose, galactose, galacturonic and glucuronic acids. The main chain of the neutral
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Ramos, Márcio Viana, Liezelotte Rezende Bomfim, Bandeira, and Henri Debray. "Evidence of an endogenous lectin receptor in seeds of the legume Cratylia floribunda." Brazilian Journal of Plant Physiology 14, no. 3 (2002): 195–202. http://dx.doi.org/10.1590/s1677-04202002000300003.

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Cratylia floribunda seeds were ground and the clean crude saline extract was fractionated into albumin, globulin, prolamin, acidic and basic glutelin protein fractions. These protein fractions were examined for the presence of an endogenous lectin receptor by SDS-polyacrylamide gel electrophoresis, western blot, affinity chromatography on a Sepharose 4B-Cratylia floribunda (CFL) lectin column and kinetic analysis in real time by surface plasmon resonance (SPR). Prolamin was the richest protein fraction although very poor in haemagglutinating activity. Basic glutelin was far the less interestin
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Wu, F. C., R. B. Mills, Y. R. Cai, R. D. Evans, and P. J. Dillon. "Photodegradation-induced changes in dissolved organic matter in acidic waters." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 5 (2005): 1019–27. http://dx.doi.org/10.1139/f05-009.

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Photodegradation of dissolved organic matter (DOM) from stream waters was investigated using dissolved organic carbon (DOC) analysis, ultraviolet-visible absorbance, three-dimensional excitational emission matrix fluorescence, and high-performance size exclusion chromatography. The effects of altering pH and various iron concentrations on DOM characteristics during irradiation were examined. DOC concentration, absorbance, and fluorescence all decreased with increasing irradiation. These decreases were accompanied by a decrease in absorbance spectral slope and average molecular size and a blue-
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Muhammad, Surayya Mustapha, Ibrahim A. Sabo, Ahmed Mohammed Gumel, and Fatima I, Alkali. "Extraction and Purification of Antimicrobial Proteins from Datura Stramonium Seed." JOURNAL OF ADVANCES IN BIOTECHNOLOGY 8 (April 17, 2019): 1073–77. http://dx.doi.org/10.24297/jbt.v8i0.8221.

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Resistant to antibiotics by microbes have become a major global challenge incurring economic and public health burden. Hence, research to develop new effective anti-biotics should be a major consideration to pharmaceutical industries, scientific researchers, Amanda ‘scientific researchers and world health organizations at large. This study is conducted to investigate the antimicrobial property of proteins present in the seeds of Datura stramonium. The extraction was carried out using Tris-HCL buffer prepared from 50M Tris and 0.3M NaCL, the proteins were isolated using ammonium sulphate precip
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Kruger, Marlena C., Gabrielle G. Plimmer, Linda M. Schollum, Neill Haggarty, Satyendra Ram, and Kate Palmano. "The effect of whey acidic protein fractions on bone loss in the ovariectomised rat." British Journal of Nutrition 94, no. 2 (2005): 244–52. http://dx.doi.org/10.1079/bjn20051454.

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Bovine milk has been shown to contain bioactive components with bone-protective properties. Earlier studies on bovine milk whey protein showed that it suppressed bone resorption in the female ovariectomised rat. A new osteotropic component was subsequently identified in the whey basic protein fraction, but bone bioactivity may also be associated with other whey fractions. In the present study, we investigated whether acidic protein fractions isolated from bovine milk whey could prevent bone loss in mature ovariectomised female rats. Six-month-old female rats were ovariectomised (OVX) or left i
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Dissertations / Theses on the topic "Acidic fraction"

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Vågberg, Mattias. "Brain parenchymal fraction in healthy individuals and in clinical follow-up of multiple sclerosis." Doctoral thesis, Umeå universitet, Klinisk neurovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128697.

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Background Multiple sclerosis (MS) is an autoimmune disease characterised by inflammatory damage to the central nervous system (CNS). Accumulated CNS injury can be quantified as brain atrophy, definable as a reduction in brain parenchymal fraction (BPF). BPF correlate with disability in MS and is used routinely as an endpoint in clinical trials. In 2009/2010, a new MS clinical care program, that includes follow-up of BPF, was introduced at Umeå University Hospital (NUS). Levels of neurofilament light polypetide (NFL) and glial fibrillary acidic protein (GFAP) in cerebrospinal fluid (CSF) are m
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Sukhbaatar, Badamkhand. "SEPARATION OF ORGANIC ACIDS AND LIGNIN FRACTION FROM BIO-OIL AND USE OF LIGNIN FRACTION IN PHENOL-FORMALDEHYDE WOOD ADHESIVE RESIN." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06062008-155306/.

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Bio-oil produced from biomass by the fast pyrolysis method is promising as a renewable fuel and as sources of industrial chemicals. In this study, lower cost separation methods of organic acids such as acetic and formic acids and pyrolytic lignin fraction present in bio-oil were investigated to provide basic data needed for future industrial production procedures. The calcium oxide method and a quaternary ammonium anion-exchange resin method were studied to separate organic acids as respective salts and the methanol-and-water method was studied to separate the water-insoluble pyrolytic lignin
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Gourdon, Rémy. "Traitement d'un lixiviat de décharge en filtre bactérien anaérobie : -étude cinétique de l’épuration de la fraction organique facilement biodégradable (acides gras volatiles) ; - analyse de la fraction organique non biodégradée." Lyon, INSA, 1987. http://www.theses.fr/1987ISAL0004.

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Dans le but de mieux connaître et contrôler l'épuration biologique des lixiviats de décharge, un réacteur anaérobie à garnissage de vermiculite expansée et écoulement piston, bien adapté à suivre l'évolution d'un volume réactionnel déterminé, a été conçu et réalisé au Laboratoire de Chimie Physique Appliquée et Environnement de l'INSA de LYON. Avec une biomasse équilibrée et stable, mais constituée d'une population bactérienne mixte et complexe quasi identique dans tout le réacteur, la cinétique de biodégradation des acides acétique, propionique et butyrique a été étudiée dans des conditions p
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Faure, Henri. "La fraction ultrafiltrable du zinc sérique : implications physiopathologiques et relations avec les amino-acides." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE18004.

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Калина, Вікторія Сергіївна. "Технологія комплексної переробки жирної коріандрової олії". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21850.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.18.06 – технологія жирів, ефірних масел і парфумерно-косметичних продуктів. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, м. Харків, 2016. Дисертаційну роботу присвячено науковому обґрунтуванню та розробці технології комплексної переробки жирної коріандрової олії. Експериментально визначено фізико-хімічні показники та жирнокислотний склад промислових зразків початкової олії. Встановлено ефективні технологічні параметри зниження кислотного та пер
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Калина, Вікторія Сергіївна. "Технологія комплексної переробки жирної коріандрової олії". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21848.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.18.06 – технологія жирів, ефірних масел і парфумерно-косметичних продуктів. – Національний технічний університет “Харківський політехнічний інститут” Міністерства освіти і науки України, м. Харків, 2016. Дисертаційну роботу присвячено науковому обґрунтуванню та розробці технології комплексної переробки жирної коріандрової олії. Експериментально визначено фізико-хімічні показники та жирнокислотний склад промислових зразків початкової олії. Встановлено ефективні технологічні параметри зниження кислотного та пер
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Gourdon, Rémy. "Traitement d'un lixiviat en filtre bactérien anaérobie étude cinétique de l'épuration de la fraction organique facilement biodégradable, acides gras volatils) : analyse de la fraction organique non biodégradée /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37605550h.

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Armougom, Marie-Pulchérie. "Étude de la fraction lipidique des graines de cucurbitacées tropicales des genres Lagenaria, Luffa, Momordica." La Réunion, 1998. http://tel.archives-ouvertes.fr/tel-00489158/fr/.

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La première partie de ce travail est consacrée à une mise au point sur les méthodes d'extraction et d'analyses des corps gras. La seconde partie s'interesse aux Cucurbitacées des pays tempérés. Une présentation botanique générale de la famille est donnée ainsi que la composition chimique en faisant, en particulier, apparaître au niveau de la composition en acides gras, deux types d'huiles : alimentaires ou siccatives. Les résultats obtenus sur l'étude de cinq Cucvurbitacées tropicales des genres Lagenaria (calebasse bouteille et calebasse la gale), Luffa (pipangaille lisse et pipangaille à côt
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El, Fallah Rawa. "Étude des interactions du Benzo(a)pyrène avec les trois fractions physiques de la matière organique du sol par matrices d'excitation et d'émission de fluorescence couplées à PARAFAC." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0034/document.

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Les propriétés spectrales des composants fluorescents de la matière organique d’un sol naturel ont été étudiées dans les trois fractions physiques ; substances humiques, acide fulvique et acide humique, par la méthode des matrices d’excitation et d’émission de fluorescence couplée à l’algorithme Parallel Factor analysis (PARAFAC). Les modifications spectrales de ces composants ont été suivies (forme et pseudo-concentrations) en présence d’un contaminant de type hydrocarbure aromatique polycyclique (le benzo(a)pyrène (BaP), toxique et à caractère cancérigène) : (1) en faisant varier les volumes
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Armougom, Pulchérie Rosanne. "Étude de la fraction lipidique des graines de Cucurbitacées tropicales des genres Lagenaria, Luffa, Momordica." Phd thesis, Université de la Réunion, 1998. http://tel.archives-ouvertes.fr/tel-00489158.

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La première partie de ce travail est consacrée à une mise au point sur les méthodes d'extraction et d'analyses des corps gras. La seconde partie s'interesse aux Cucurbitacées des pays tempérés. Une présentation botanique générale de la famille est donnée ainsi que la composition chimique en faisant, en particulier, apparaître au niveau de la composition en acides gras, deux types d'huiles : alimentaires ou siccatives. Les résultats obtenus sur l'étude de cinq Cucvurbitacées tropicales des genres Lagenaria (calebasse bouteille et calebasse la gale), Luffa (pipangaille lisse et pipangaille à côt
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Books on the topic "Acidic fraction"

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Salo, Pia. Fatty acid composition of serum lipid fractions in young children in a prospective randomised trial of low-saturated fat, low-cholesterol diet. University of Turku, 1999., 1999.

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Mamontov, Vladimir. Soil chemistry: a practical course. INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1079438.

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The textbook describes methods for analyzing the elemental composition of the mineral part of soils, ways to express the results of gross analysis and recalculation of analytical data. Methods for studying the ion-salt complex of soils and available forms of plant nutrition elements, as well as methods used to determine the total humus and nitrogen, group and fractional composition of humus, and methods for studying some properties of humic acids are presented. The use of gross analysis data, the results of studying the ion-salt complex and soil organic matter for practical purposes is conside
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Beller, Harry R. Distributions of polychlorinated biphenyls (PCB's), hydrocarbons and fatty acids among sedimentary organic matter fractions. 1985.

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Clarke, Andrew. Temperature, growth and size. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199551668.003.0013.

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Growth involves two flows of energy. The first is chemical potential energy in the monomers used to construct the proteins, lipids, polysaccharides and nucleic acids forming the new tissue. The second is the metabolic energy (ATP or GTP) used to construct the new tissue; this is the metabolic cost of growth and can be expressed as a dimensionless fraction of the energy retained in the new tissue. Its value is ~0.33. Typical temperature sensitivities for growth in the wild lie in the range Q10 1.5 – 3. Within species there may be evolutionary adjustments to growth rate to offset the effects of
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Telch, Joseph. Re-examination of human protein requirements by the use of the fractional oxydation rate of marker amino acids using labelled leucine and lycine. 1986.

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The properties of solvents. Wiley, 1998.

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Book chapters on the topic "Acidic fraction"

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Nriagu, Jerome O., and Henry K. T. Wong. "What Fraction of the Total Metal Flux Into Lakes is Retained in the Sediments?" In Acidic Precipitation. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3385-9_199.

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Righetti, Maria Cristina. "Amorphous Fractions of Poly(lactic acid)." In Synthesis, Structure and Properties of Poly(lactic acid). Springer International Publishing, 2017. http://dx.doi.org/10.1007/12_2016_14.

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Kanauchi, Makoto, Ayaka Kondo, and Kyoko Asami. "Eliminating Lipopolysaccharide (LPS) Using Lactic Acid Bacteria (LAB) and a Fraction of its LPS-Elimination Protein." In Lactic Acid Bacteria. Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-8907-2_15.

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Andren, Cecilia, Paul Andersson, and Elisabeth Fröberg. "Temporal Variations of Aluminium Fractions in Streams in the Delsbo Area, Central Sweden." In Acid rain 2000. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-007-0810-5_133.

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Kreitz, Silke, and Traute-Heidi Anderson. "Substrate Utilization Patterns of Extractable and Non-Extractable Bacterial Fractions in Neutral and Acidic Beech Forest Soils." In Microbial Communities. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60694-6_14.

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Török, E. "Contributions to the Amino Acid Composition of Protein Fractions of Wheat Flours." In Amino Acid Composition and Biological Value of Cereal Proteins. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5307-9_21.

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Campanera, Josep M., Xavier Barril, and F. Javier Luque. "On the transferability of fractional contributions to the hydration free energy of amino acids." In Highlights in Theoretical Chemistry. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-41272-1_15.

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Kihlström, Markku, V. Marjomäki, and A. Salminen. "Effects of free fatty acids, lysophosphatides and phospholipase treatment on lipid peroxidation of myocardial homogenates and membrane fractions." In Lipid metabolism in the normoxic and ischaemic heart. Steinkopff, 1987. http://dx.doi.org/10.1007/978-3-662-08390-1_30.

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Londonkar, Ramesh, and Maithilee Kesralikar. "In Vitro Anticancer Screening of Methanolic Extract of Stachytarpheta Mutabilis." In Proceedings of the Conference BioSangam 2022: Emerging Trends in Biotechnology (BIOSANGAM 2022). Atlantis Press International BV, 2022. http://dx.doi.org/10.2991/978-94-6463-020-6_19.

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AbstractIn therapeutic plants, phytochemicals are found in abundance. A family of verbena known as vervain (verbenaceae) consists of over 100 genera and nearly 2600 species. Among the Verbenaceae family is Stachytarpheta, a green perennial herb. The species is being examined in this study for its phytochemical, antioxidant, and anti-inflammatory properties. Stachytarpheta mutabilis methanol extracts were studied for their phytochemical screening, antimicrobial, anti-inflammatory, and anticancerous effects in the current study. Phytochemical study revealed the presence of alkaloids, flavonoids,
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Cup, W., G. Mazza, and C. G. Biliaderis. "Processing optimization and physico-chemical characteristics of flaxseed polysaccharide gums." In Gums and Stabilisers for the Food Industry 7. Oxford University PressOxford, 1994. http://dx.doi.org/10.1093/oso/9780199634651.003.0012.

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Abstract Response surface methodology was used to optimize the aqueous extraction of polysaccharides from flaxseed. Temperature, pH and seed/water ratio were the major parameters affecting yield, chemical composition and rheological characteristics of the crude gum extract. Optimum conditions for extraction were a temperature of 85-90°C and a neutral pH (6.5-7). Seed/water ratio had a smaller effect on yield and properties of flaxseed gum than temperature and pH. Flaxseed gum extracted under optimum conditions gave relatively high yield (7.9%) and contained over 80% carbohydrates. Using ion ex
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Conference papers on the topic "Acidic fraction"

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Groysman, Alec, Naphtali Brodsky, Joseph Penner, Alon Goldis, and Natali Savchenko. "Study of Corrosiveness of Acidic Crude Oil and It's Fractions." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05568.

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Abstract Every time new acidic crude oils are used, the problem of naphthenic acids (NA) arises again. Most investigations concern the corrosiveness of crude oils or gas oil fractions containing NA. In the acidic crude oil “A”, the kerosene fraction was the most corrosive. The main goal of this work is to investigate the corrosiveness of different petroleum fractions distilled from acidic crude oil “A” at 150 to 370°C (302 to 698°F) and to find effective measures for diminishing the corrosiveness of aggressive fractions. Corrosiveness of acidic crude oil “A” and petroleum distillates towards p
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Keiser, James R., Michael P. Brady, Jeffrey K. Thomson, Raynella M. Connatser, Samuel A. Lewis, and Donovan N. Leonard. "Bio-Oil Properties and Effects on Containment Materials." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-4423.

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Abstract Biomass derived liquids offer a potential for conversion into liquid fuels such as gasoline, jet fuel, diesel, and fuel oil. However, the bio-oils, whether produced by any of a number of processes, contain significant concentrations of water and oxygen-containing organic compounds. Of the oxygenates, carboxylic acids constitute a significant fraction, and these compounds, primarily formic and acetic acids, make bio-oil quite acidic. Unless the carboxylic acids are removed, bio-oil presents corrosion issues for materials used to construct the systems used for production, processing, tr
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Hausmann, D. A. "Long-term Performance of Steel in Concrete Immersed in Seawater." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04284.

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Abstract Twelve-year laboratory tests of rebar reinforced concrete beams partially submerged in artificial seawater have confirmed that steel corrosion may occur a few months after immersion and may continue for many years. An average steel potential of -71 mV (SCE) was established during the first few months of immersion. Pitting corrosion, marked by a sharp shift in potential of -200 to -300 mV, occurred when chlorides in sufficient concentration reached the rebar surface. Oxygen in air bubbles on the surface provided the cathodic reactant. The average potential reached a maximum negative po
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Kurapati, Yathish, Winston Robbins, Gheorghe Bota, and David Young. "Corrosion Behavior of Naphthenic Acids Isolated from Vacuum Gas Oil Fractions." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11071.

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Abstract Opportunity crudes frequently have increased acidity, making high temperature naphthenic acid (NAP) corrosion a key concern for their processing in refineries. Lab corrosion rates are hard to interpret due to either variable composition of crude fractions or the use of commercially available model carboxylic acids that may be unrepresentative of NAP species present in vacuum gas oils (VGO). Here, the corrosion behavior of native naphthenic acids in two VGO fractions are compared with white oil solutions of the acids isolated from them by solid phase extraction (SPE). Corrosion tests a
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Yoon, Yuhchae, Hui Li, and Kwei Meng Yap. "Naphthenic Acid Corrosion and Sulfidic Corrosion in Crude Oil Fractions." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17533.

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ABSTRACT Crude Corrosivity issues manifest themselves at locations where fluid flow rates and velocities are relatively high in atmospheric distillation units, vacuum distillation units, transfer lines, valves, baffles, heat exchangers, and side cut piping in refinery systems. The heavy vacuum gas oil fraction of the vacuum distillation plant is the crude fraction which usually has the highest total acid number (TAN) due to high concentration of naphthenic acids close to their boiling points. This mechanism of non-aqueous corrosion in the presence of crude oil or oil fractions with high quanti
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Bota, Gheorghe, Ishan Patel, Peng Jin, and David Young. "Predicting Corrosion of Successive Feeds in Distilling Units – An Experimental Approach." In CONFERENCE 2024. AMPP, 2024. https://doi.org/10.5006/c2024-20668.

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Abstract Cheap heavy crudes become attractive for oil refineries to increase their benefit margins but the corrosivity of heavy crudes compels the refinery engineers to blend them with the more expensive light sweet crudes. Crude oil blends with complex composition including organo-sulfur compounds, fatty acids, nitrogen and chlorine compounds become corrosive when processed at high temperatures due to these reactive species. Therefore, maintaining corrosion control is a constant effort in oil refineries, and it involves the use of dedicated corrosion models combined with specific experimental
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Jin, Peng, Winston Robbins, and Gheorghe Bota. "Mechanism of High Temperature Corrosion by Model Naphthenic Acids." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07302.

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Abstract Naphthenic acid (NAP) corrosion is one of the major concerns for corrosion engineers in refineries, particularly with the increasing acidity in “opportunity crudes”. However, complex compositions of NAP in crude oil make it difficult to evaluate accurately their corrosive behavior. In the present study, several model acids, including 4-phenylbutyric acid, 1-naphthoic acid, and 4-cyclohexyl pentanoic acid, have been tested in lab scale experiments previous applied to real crude fractions. Pretreatment/challenge protocol tests the corrosive behavior of the model acids under temperature
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Miranda, Carlos Mejía, Dionisio Laverde Cataño, and Haydée Quiroga Becerra. "Method for Simulating the Effect of Pressure in Transfer Lines on the Corrosivity of HACs." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-06067.

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Abstract The decrease of world reserves of conventional crude has led the oil industry to increase the percentage of so-called opportunity crudes in blends entering the distillation units. Among opportunity crudes are the high acid crudes, which cause corrosion problems in the temperature range 220-400°C. The heterogeneity in the chemical nature of naphthenic acids present in crude hinders the development of accurate predictive tools. Many studies have been done to evaluate the effect of temperature and hydrodynamic conditions on the corrosivity of naphthenic acids. However, the effect of pres
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Messer, B., B. Tarleton, M. Beaton, and T. Phillips. "New Theory for Naphthenic Acid Corrosivity of Athabasca Oilsands Crudes." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04634.

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Abstract Canadian Athabasca oilsand bitumen crudes, characterized as corrosive by the classical naphthenic model, are producing negligible naphthenic acid corrosion in crude and vacuum units after more than 50 years of cumulative operation. A new theory proposes that the corrosivity of naphthenic acids in Athabasca oilsand bitumen crudes is a function of its molecular weight, molecular structure, true boiling point, reactive sulfidic species, and local environment. The concept of α (bad type) and β (good type) naphthenic acids is introduced. The α naphthenic acids are characterized as corrosiv
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Groysman, Alec, Naphtali Brodsky, Joseph Pener, and Dmitry Shmulevich. "Low Temperature Naphthenic Acid Corrosion Study." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07569.

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Abstract The aim of this work is to define the corrosiveness of naphthenic acids and to examine a non-phosphorus corrosion inhibitor for low temperature (~ 200°C) naphthenic acid corrosion. Corrosiveness of NA is a function of their molecular weight (boiling point), and temperature. Corrosiveness of seven pure NA, twelve aliphatic and two aromatic organic acids, and fractions of NA distilled from industrial NA mixtures of three suppliers “F”, “A”, and “M”, was examined at their boiling points and at 195°C. Corrosion rates of carbon steel in contact with boiling aliphatic organic acids were 12
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Reports on the topic "Acidic fraction"

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Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would
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WHITE, M. A. Molar Fraction of Oxalic Acid in Vapor Phase for Tank 241-C-106 Acid Dissolution Project. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/815073.

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Pearson, C. D., and J. D. Green. Vanadium and nickel complexes in petroleum resid acid, base, and neutral fractions. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/6745845.

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Pearson, C. D., and J. D. Green. Vanadium and nickel complexes in petroleum resid acid, base, and neutral fractions. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10133053.

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พงษ์สามารถ, สุนันท์, та นรานินทร์ มารคแมน. การสกัดสารคล้ายเพคตินและการทำให้บริสุทธิ์จากเปลือกผลไม้ไทย : รายงานวิจัย. จุฬาลงกรณ์มหาวิทยาลัย, 1989. https://doi.org/10.58837/chula.res.1989.5.

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การสกัดสารคล้ายเพคตินจากเปลือกผลไม้ไทย 2 ชนิด คือ เปลือกทุเรียน (Durio zibethinus) และเปลือกส้มโอ (Citrus maxima Merr.) และจากผลไม้ 2 ชนิด คือ พุทรา (Zizyphus mauritiana Lamk.) และฝรั่ง (Psidium guajava Linn.) โดยการตกตะกอน aqueous extracts ของผลไม้ตัวอย่างใน 60% alcohol ได้สารสกัด crude extracts ของผลเท่ากับ 0.8% 0.6% 1.7% และ 0.9% ตามลำดับ การเติมโซเดียมเฮกซาเมตฟอสเฟต (Sodium hexametaphosphate) ขณะทำ aqueous extraction สามารถช่วยเพิ่ม yield ของการสกัดสารคล้ายเพคติตจากเปลือกทุเรียนทำให้ได้สารสกัด crude fraction (F I) เป็น 2.18% yield การทำสารสกัดเปลือกทุเรียนให้บริสุทธิ์โดยตกตะกอนด้วย 75% alc
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Avnimelech, Yoram, Richard C. Stehouwer, and Jon Chorover. Use of Composted Waste Materials for Enhanced Ca Migration and Exchange in Sodic Soils and Acidic Minespoils. United States Department of Agriculture, 2001. http://dx.doi.org/10.32747/2001.7575291.bard.

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Restoration of degraded lands and the development of beneficial uses for waste products are important challenges facing our society. In addition there is a need to find useful and environmentally friendly applications for the organic fractions of municipal and other solid waste. Recent studies have shown that composted wastes combined with gypsum or gypsum-containing flue gas desulfurization by-products enhance restoration of sodic soils and acidic minespoils. The mechanism by which this synergistic effect occurs in systems at opposite pH extremes appears to involve enhanced Ca migration and e
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พงษ์สามารถ, สุนันท์. การศึกษาสารสกัดคาร์โบฮัยเดรตจากเปลือกทุเรียนเพื่อใช้เป็นสารแขวนตะกอน. จุฬาลงกรณ์มหาวิทยาลัย, 1989. https://doi.org/10.58837/chula.res.1989.7.

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สกัดสารคาร์โบไฮเดรตจากเปลือกทุเรียน (Durio zibethinus Linn.) เป็น 2 fraction คือ crude fraction (F I) ได้จากการตกตะกอย aqueous extract จากเปลือกทุเรียนสดด้วย 60% alcohol และ purified fraction (F II) ได้จากการทำ crude extract ซึ่งเตรียมจากการตกตะกอน acid-alcohol ของ aqueous extract จากเปลือกทุเรียนสดมาทำให้บริสุทธิ์โดยตกตะกอนซ้ำด้วย alcohol การสกัดตามวิธีทั้งสองจะให้ F I 2.18% และ F II 1.03% ตามลำดับ สารสกัดเปลือกทุเรียนมีลักษณะเป็นของแข็ง ผงของสารมีรูปร่างไม่แน่นอน พบมีรูปร่างเป็นก้อนกลมและเป็นไฟเบอร์จากการดูด้วยกล้องจุลทรรศน์อิเล็กตรอนแบบ scanning F I เป็นผงสีน้ำตาลอ่อน F II เป็นผงสีขาวนวล มี
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พงษ์สามารถ, สุนันท์. การศึกษาสารสกัดคาร์โบฮัยเดรตจากเปลือกทุเรียนเพื่อใช้เป็นสารแขวนตะกอน. จุฬาลงกรณ์มหาวิทยาลัย, 1991. https://doi.org/10.58837/chula.res.1991.8.

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สกัดสารคาร์โบไฮเดรตจากเปลือกทุเรียน (Durio zibethinus Linn.) เป็น 2 fraction คือ crude fraction (F I) ได้จากการตกตะกอย aqueous extract จากเปลือกทุเรียนสดด้วย 60% alcohol และ purified fraction (F II) ได้จากการทำ crude extract ซึ่งเตรียมจากการตกตะกอน acid-alcohol ของ aqueous extract จากเปลือกทุเรียนสดมาทำให้บริสุทธิ์โดยตกตะกอนซ้ำด้วย alcohol การสกัดตามวิธีทั้งสองจะให้ F I 2.18% และ F II 1.03% ตามลำดับ สารสกัดเปลือกทุเรียนมีลักษณะเป็นของแข็ง ผงของสารมีรูปร่างไม่แน่นอน พบมีรูปร่างเป็นก้อนกลมและเป็นไฟเบอร์จากการดูด้วยกล้องจุลทรรศน์อิเล็กตรอนแบบ scanning F I เป็นผงสีน้ำตาลอ่อน F II เป็นผงสีขาวนวล มี
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the
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Pemberton, R. G., D. Edser, and MRL Gower. Optimisation of acid digestion conditions for volume fraction measurements of hard to digest fibre-reinforced polymer composites. National Physical Laboratory, 2020. http://dx.doi.org/10.47120/npl.mn12.

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