Methyl Oleate
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. MODIFICAÇÃO QUÍMICA DO POLIPROPILENO ATRAVÉS DA INTRODUÇÃO DE GRUPOS SULFÔNICOS PARA APLICAÇÃO COMO CATALISADOR EM REAÇÕES DE ESTERIFICAÇÃO
In this work, the chemical modification of pristine polypropylene was carried out through sulfonation reactions with concentrated sulfuric acid (PPS1) and fuming sulfuric acid (PPS2), for production of heterogeneous catalysts used in esterification reactions. Fourier transform infrared spectroscopy, elemental analysis, degree of substitution and ion exchange
Quím. Nova. Publicado em: 2021-04
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2. Application of Full Factorial Design to Evaluate the Effect of Different Variables on the Stability of Biodiesel:Diesel Blends under Storage Conditions
Biodiesel is obtained from a renewable source and has been used as an alternative to fossil fuels. It has unsaturated fatty acid methyl esters that can degrade due to oxidation of the double bonds. The instability of biodiesel during storage may cause problems regarding the maintenance and operation of motors. This work evaluated the effect of several variab
J. Braz. Chem. Soc.. Publicado em: 2017-10
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3. FAST GC-FID METHOD FOR MONITORING ACIDIC AND BASIC CATALYTIC TRANSESTERIFICATION REACTIONS IN VEGETABLE OILS TO METHYL ESTER BIODIESEL PREPARATION
A fast gas chromatography with a flame ionisation detector (GC-FID) method for the simultaneous analysis of methyl palmitate (C16:0), stearate (C18:0), oleate (C18:1), linoleate (C18:2) and linolenate (C18:3) in biodiesel samples was proposed. The analysis was conducted in a customised ionic-liquid stationary-phase capillary, SLB-IL 111, with a length of 14
Quím. Nova. Publicado em: 2016-04
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4. PERFORMANCE OF LOOFA-IMMOBILIZED Rhizopus oryzae IN THE ENZYMATIC PRODUCTION OF BIODIESEL WITH USE OF OLEIC ACID IN n-HEXANE MEDIUM
AbstractThe performance of loofa-immobilized Rhizopus oryzae (as a whole-cell biocatalyst) in the synthesis of methyl oleate was evaluated using oleic acid as a model substrate. The activities of the cell-bound lipase in terms of the esterification and hydrolysis reactions were found to be higher for the immobilized cells as compared with those of the free c
Braz. J. Chem. Eng.. Publicado em: 2015-06
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5. Hidroformilação do oleato de metila catalisada por complexos de ródio
In this work, we describe the hydroformylation of methyl oleate catalyzed by several rhodium complexes. Parameters including total pressure, phosphorous/rhodium and CO/H2 ratio, temperature and phosphorous ligands were scanned. Total conversion of the starting double bonds was achieved while maintaining excellent selectivity in aldehydes.
Quím. Nova. Publicado em: 2012
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6. Preparation and characterization oF Ru-Sn/Al2O3 catalysts for the hydrogenation of fatty acid methyl esters
Ru-Sn/Al2O3 catalysts with different Sn loadings were prepared by the coimpregnation method. Several characterization techniques such as TPR, pyridine TPD and catalytic tests for dehydrogenation and hydrogenolysis were used to evaluate and compare such catalysts. TPR results indicate that Sn is deposited both onto the support and as species strongly interact
Química Nova. Publicado em: 2010
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7. Determinação do teor de ésteres graxos em biodiesel metílico de soja por cromatografia gasosa utilizando oleato de etila como padrão interno
A method for ester content determination in soybean methyl biodiesel was studied, using ethyl oleate as internal standard. A biodiesel sample was analyzed and had its purity estimated as 92.8%. Method accuracy was evaluated by comparison with the result obtained via EN14103, with a relative difference of 0.1%. Repetitivity and intermediate precision were est
Química Nova. Publicado em: 2010
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8. Studies on the experimental variables effects on rhodium catalyzed hydroformylation of unsaturated fatty esters and comparison of [RhH(CO)(PPh3)3] and [RhCl3.3H2O] as starting catalytic precursors
Reações de hidroformilação foram realizadas com oleato de metila grau técnico e óleo de soja usando [RhH(CO)(PPh3)3] e [RhCl3.3H2O] (ligação dupla/Rh = 745) como precursores catalíticos, modificados ou não por trifenilfosfina. O complexo [RhH(CO)(PPh3)3] levou a 100% de conversão e 80-91% de produtos hidroformilados em 4 h para ambos substratos, s
Publicado em: 2010
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9. Caracterização de catalisadores usados na oleoquímica
In order to improve the physical-chemical properties of bio oil from castor oil were used as catalysts silica and alumina, both pure and doped. The study showed that products from the catalytic cracking of castor oil have properties more satisfactory, especially when using alumina. This fact can be explained by higher acidity, mesoporous characteristic and s
Publicado em: 2010
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10. CHEMISTRY OF Acosmium dasycarpum: IDENTIFICATION OF QUINOLIZIDINE ALKALOIDS BY GC-MS / CHEMISTRY OF Acosmium dasycarpum: IDENTIFICATION OF QUINOLIZIDINE ALKALOIDS BY GC-MS / Química de Acosmium dasycarpum : identificação de alcalóides quinolizidínicos por CG-EM / Química de Acosmium dasycarpum : identificação de alcalóides quinolizidínicos por CG-EM
This work reports the identification of quinolizidíne alkaloids (QA) and other non-alkaloidal secondary metabolites found in plants, and a discussion on the likely biosynthetic pathway of quinolizidine alkaloids. Phytochemical study of A. dasycarpum resulted in the isolation of 26 substances, 9 of them quinolizidine alkaloids: homo-6-epipodopetaline, acosmi
Publicado em: 2009
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11. Chemical study and evaluation of cytotoxic activity from ascidians Didemnum psammatodes (Sluiter, 1895) and Eudistoma vannamei Millar, 1977 (Tunicata: Ascidiacea) / Estudo químico e avaliação da atividade citotóxica das ascídias Didemnum psammatodes(Sluiter, 1885) e Eudistoma vannameiMillar, 1977 (Tunicata: Ascidiacea)
Samples of Didemnum psammatodes were collected in Icapui (Ceara State) and Trairi (Ceara State). The methanolic extract from D. psammatodes, acquired from Icapui, was submitted to fractionation and purification through several chromatographic techniques and were obtained four nucleosides (2?-deoxyuridine, 2- deoxyinosine, thyimidine, and 2?-deoxyguanosine),
Publicado em: 2006
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12. Sintese e caracterização de [Nb]-MCM-41 e NbxOy(OH)z-montmorilonita e aplicações em catalise redox e acida / Synthesis and characterization of [Nb]-MCM-41 and NbxOy(OH)z-montmorillonite and its applications in redox and acid catalysis
Nb-MCM-41 synthesis was optimized at room temperature varying the hydroxide, the silica and niobium sources and the order of addition of the niobium source. The materials, before and after the calcinations, were characterized by XRD and UV-Vis diffuse reflectance. The Nb-MCM-41 with best results was silylated and characterized by inductively coupled plasma o
Publicado em: 2005