Esterification Treatment
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. New Magnetic Fe Oxide-Carbon Based Acid Catalyst Prepared from Bio-Oil for Esterification Reactions
In this work, bio-oil (an organic matrix rich in oxygen functionalities) was used to efficiently dissolve and disperse Fe3+ which upon thermal treatment produced a carbon containing dispersed and encapsulated Fe oxide magnetic nanoparticles. These materials were prepared by dissolution of 8, 16 and 24 wt.% Fe3+ salt in bio-oil followed by treatment at 400, 4
J. Braz. Chem. Soc.. Publicado em: 2020-08
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2. Avaliação do tratamento térmico no catalisador magnético Ni0,5Zn0,5Fe2O4 e sua atividade catalítica na produção de biodiesel por transesterificação e esterificação simultânea do óleo de fritura
Resumo O objetivo deste trabalho foi avaliar o efeito do tratamento térmico na síntese do catalisador Ni0,5Zn0,5Fe2O4 e o desempenho catalítico em reações de transesterificação e esterificação simultânea (TES) do óleo de fritura. Os catalisadores foram sintetizados por reação de combustão sem e com tratamento térmico sequencial a 800 °C com t
Cerâmica. Publicado em: 2019-01
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3. ESTERIFICAÇÃO E TRANSESTERIFICAÇÃO HOMOGÊNEA DE ÓLEOS VEGETAIS CONTENDO ALTO TEOR DE ÁCIDOS GRAXOS LIVRES
The high free fatty acids content in some vegetable oils can have a negative impact in the sustainable production of biodiesel. The previous treatment of these feedstock oils can contribute to the reduction of the process total costs as well as the environment, turning the biodiesel a more competitive in relation to the fossil diesel. The aim of this work wa
Quím. Nova. Publicado em: 2018-01
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4. Synthesis and Evaluation of Cytotoxic Effects of Amino-ester Derivatives of Natural α,β-Amyrin Mixture
Natural α,β-amyrins were isolated from endemic Brazilian Esenbeckia grandiflora Mart., and eight synthetic derivatives were obtained by esterification reactions with bromo acetate, followed by amine treatment. The structures of the all compounds were confirmed by 1H and 13C nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) and high-resolu
J. Braz. Chem. Soc.. Publicado em: 2017-11
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5. Effect of the Acid Treatment of Montmorillonite Clay in the Oleic Acid Esterification Reaction
Biodiesel is a fuel renewable, biodegradable and environmentally correct fuel, which can be obtained from the esterification reactions, transesterification and pyrolisis. Montmorillonite is a clay mineral of the smectite group and are of great interest for industrial processes such as catalysis and adsorption. Acid activation of clay minerals is one of the m
Mat. Res.. Publicado em: 2015-04
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6. Immobilization of Beauveria bassiana Lipase on Silica Gel by Physical Adsorption
Extracellular lipase from Beauveria bassianastrain CG481 was immobilized by using thirteen different immobilization protocols. Silica gel was chosen as the most suitable adsorbent with 94.8% of activity yield. The adsorption on silica gel did not change the optimum pH (8.5) and temperature (45ºC) values of the free lipase (FL) for lipolytic activity, and it
Braz. arch. biol. technol.. Publicado em: 2014-12
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7. Impregnação do ácido 12-fosfotúngstico em sílica - parte I: determinação de parâmetros de impregnação, caracterização e avaliação da atividade catalítica
Catalyst based on Kegging-type heteropolyacids (H3PW12O40 - HPA), supported on SiO2 (H3PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HP
Química Nova. Publicado em: 2012
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8. ContribuiÃÃo ao Conhecimento QuÃmico - FarmacolÃgico de Plantas do Nordeste do Brasil: Luffa operculata Cogn / CHEMICAL-BIOLOGICAL CONTRIBUTION TO OUR KNOWLEDGE OF PLANTS OF NORTHEAST BRAZIL: Luffa operculata Cogn.
Luffa operculata (Cucurbitaceae) is a plant widely distributed in Northeastern Brazil, where is known as âcabacinhaâ. An aqueous solution from the fruit of âcabacinhaâ has been popularly used for the treatment of sinusitis as a bitter stomachic and purgative remedy. The broad spectrum of pharmacological effects reported in the literature and the abundanc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2011
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9. Esterificação de ácidos graxos utilizando zircônia sulfatada e compósitos carvão ativado/zircônia sulfatada como catalisadores
In this work sulfated zirconia (SZr) and activated carbon/SZr composites produced by impregnation method with or without heating treatment step (CABC/SZr-I and CABC/SZr-I SC) and by the method of synthesis of SZr on the carbon (CABC/SZr-S) was used as catalysts in the esterification reactions of fatty acids. The SZr presented very active, conversions higher
Química Nova. Publicado em: 2011-09
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10. Efeito da adição de coentro e urucum na composição de acidos graxos em file de pescada branca (Cynoscion spp) / Effect of the addition of coriander and annatto on white hake filet1s fatty acid composition
One of the main characteristics of fish lipids is its high content of long chain polyunsaturated fatty acids. These fatty acids are well known to exert beneficial effects on human health; however, they are highly prone to oxidation. Annatto and coriander are two spices widely used in the Brazilian cuisine that have been previously studied for their antioxida
Publicado em: 2010
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11. Modulation of peritoneal macrophage activity by the saturation state of the fatty acid moiety of phosphatidylcholine
To determine the effects of saturated and unsaturated fatty acids in phosphatidylcholine (PC) on macrophage activity, peritoneal lavage cells were cultured in the presence of phosphatidylcholine rich in saturated or unsaturated fatty acids (sat PC and unsat PC, respectively), both used at concentrations of 32 and 64 µM. The treatment of peritoneal macrophag
Brazilian Journal of Medical and Biological Research. Publicado em: 22/05/2009
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12. BIODIESEL A PARTIR DE ÓLEOS DE ALTA ACIDEZ: Desenvolvimento de um processo catalítico homogêneo
The present work aims at developing a process for the production of biodiesel from oils of high acidity, using a process in two steps in homogeneous catalysis. The first is the reaction of ethyl esterification of free fatty acid, catalyzed by H2SO4, occurring on triglycerides and the second is the transesterification of residual triglycerides, from the first
Publicado em: 2009