Optimization and kinetic study on the synthesis of palm oil ester using Lipozyme TL IM

Basri, Mahiran; Kassim, Mohd Azlan; Mohamad, Rosfarizan; Ariff, Arbakariya B.

doi:10.1016/j.molcatb.2012.09.013

Cited by 52 publications

(30 citation statements)

References 27 publications

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“…A energia de ativação obtida neste estudo foi menor que a encontrada por diversos autores. Basri et al (2013), que obtiveram uma energia de ativação de 16,85 kJ mol -1 , para a produção de etil ésteres a partir de (Fennema, 1996), pode-se afirmar que peneira molecular 4 Å, mostrou-se um interessante catalisador para produção de acetato de eugenila. Porém, são necessários estudos adicionais, avaliando se em temperaturas mais elevadas ocorre ou não limitações de transferência de massa na reação, uma vez que esta limitação pode influenciar na obtenção de baixos valores de energia de ativação.…”

Section: Resultsunclassified

Determinação Da Energia De Ativação Na Produção De Acetato De Eugenila via Catálise Heterogênea

Loss¹,

Laroque²,

Silva³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Devido à crescente busca por processos ecologicamente corretos, a catálise heterogênea tem recebido destaque por sua eficiência para alcançar transformações limpas, além de vantagens relacionadas a atividade e seletividade das reações. O presente trabalho tem como objetivo determinar a energia de ativação na produção de acetato de eugenila, empregando como catalisador a peneira molecular 4Å. Para tanto, utilizou-se a equação de Arrhenius, sendo que as temperaturas avaliadas foram 40, 50, 55 e 60 ºC, a proporção de catalisador foi de 12 % (m/m de substratos) e a razão molar de eugenol e anidrido acético de 1:3. Resultados das cinéticas destrutivas mostram que as conversões em acetato de eugenila aumentaram com a elevação da temperatura. Além disso, um catalisador tem função de diminuir a energia necessária para ocorrência da reação, neste caso, a peneira molecular mostrou-se um catalisador interessante, uma vez que apresentou baixa energia de ativação quando comparada com outros catalisadores empregados em reações de esterificação. Desta forma, conclui-se que temperaturas mais elevadas contribuem para a obtenção de maiores conversões em éster de acetato de eugenila, sendo que não foi observado necessidade de temperaturas acima de 50 ºC uma vez que conversões em éster próximas a 100% foram obtidas nesta condição. INTRODUÇÃODurante os últimos anos, os processos, que se enquadram no conceito de química verde vem ganhando destaque no mercado de aromas e fragrâncias, representando uma meta desafiadora para a pesquisa acadêmica e industrial. Aspectos ambientais e econômicos tem despertado crescente interesse, tanto da comunidade acadêmica quanto industrial em pesquisas buscando a elaboração de processos que sejam ambientalmente favoráveis, seletivos, apresentem elevados rendimentos e fácil manipulação (Sartori et al., 2004). Dentre esses fatores, se destaca a seleção do catalisador que deve ser realizada de acordo com a reação envolvida e o produto requerido, estes devem apresentar como uma das principais características baixa energia de ativação (Dumesic;Huber;Boudart, 2008).A catálise heterogênea tem conquistado um espaço cada vez maior na obtenção de compostos químicos para as mais variadas aplicações. Este processo tem se mostrado útil no

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Section: Resultsunclassified

Determinação Da Energia De Ativação Na Produção De Acetato De Eugenila via Catálise Heterogênea

Loss¹,

Laroque²,

Silva³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…While the water activity was essentially the same for both catalysts (0.28 and 0.34), the reaction rate was characterized by the amounts of reacted stearate, 12.9% and 4.6%, respectively. The reaction rate thus fell by a factor of 2.8 for the "dry" enzyme [35].…”

Section: Biocatalysts and Methods Of Their Preparationmentioning

confidence: 97%

“…The authors [18][19][20][29][30][31][32][33][34][35][36] investigated and analyzed the role of water contained both inside the biocatalysts and in the organic solvents and the gas phase. They showed that in order to achieve high activity and stability of whole cell biocat alysts, the internal water content must be optimal (5-15%); the biocatalysts in this case function as effec tively as those prepared on the basis of the extracellular (soluble) lipases.…”

Section: Biocatalysts and Methods Of Their Preparationmentioning

confidence: 99%

“…When the system was addition ally supplied with water, the half inactivation time (t ½ ) for the biocatalyst grew by a factor of 1.8 (t ½ = 18 h). An interesting result obtained by comparing two tech niques of biocatalyst preparation via immobilizing lipase on celite was described in [35]: a "wet" enzyme was mixed with dry silicate while a "dry" enzyme was mixed with wet silicate. While the water activity was essentially the same for both catalysts (0.28 and 0.34), the reaction rate was characterized by the amounts of reacted stearate, 12.9% and 4.6%, respectively.…”

Section: Biocatalysts and Methods Of Their Preparationmentioning

confidence: 99%

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Heterogeneous biocatalytic processes of vegetable oil interesterification to biodiesel

et al. 2015

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The heterogeneous biocatalytic interesterification of vegetable oils to ethyl esters of fatty acids is studied. Interesterification with ethanol or ethyl acetate is performed using biocatalysts obtained by incorpo rating cell lysates of the rE. coli/lip recombinant strain that produces thermostable Thermomyces lanuginosus lipase, into silica xerogel. The interesterification of vegetable oils is performed in both a batch stirred tank reactor and a continuous reactor with a fixed bed of the prepared biocatalyst. It is shown that ethyl acetate is the best acylating reagent for the interesterification of vegetable oil triglycerides to ethyl esters of fatty acids. Unlike ethanol, ethyl acetate does not inactivate the biocatalyst irreversibly. Under the investigated condi tions, the biocatalyst's half inactivation time was 720 hours at 40°C.Keywords: heterogeneous biocatalysts, lysates of a recombinant strain producing thermostable lipase, incor poration into silica xerogel, interesterification of vegetable oils with ethyl acetate

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“…26,37,41 Kinetic study of soybean oil transesterification with ethanol in hexane Many reports have demonstrated that the kinetic mechanism of transesterification was a Ping Pong Bi Bi mechanism with alcohol inhibition. 42,43 Kinetic parameters according to Equation (1) were determined experimentally under the optimal reaction conditions, and performed with varying concentrations of soybean oil (3.96, 4.96, 6.61, and 9.92 mol L −1 ) and ethanol (0.84, 0.99, 1.16, and 1.32 mol L −1 ) (Fig. 7).…”

Section: Reusability Of the Lipase-based Static Emulsions In Biodiesementioning

confidence: 99%

Lipase based static emulsions as efficient biocatalysts for biodiesel production

Zhou

Jiang

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND Enzymatic production of biodiesel is an alternative solution to circumvent the problems associated with chemical catalysis. However, the drawbacks, including lower stability and reusability of the lipase, often make this route unfeasible for industrial application. RESULTS A stable biocatalyst system was prepared by trapping an aqueous solution of Burkholderiacepacia lipase (BCL) in bead‐shaped silicone microspheres (named lipase‐based static emulsions). Compared with free BCL, lipase‐based static emulsions showed outstanding stability under vigorous shaking conditions and the thermal stability was improved. The lipase‐based static emulsions were employed to catalyze the transesterification of soybean oil with ethanol for biodiesel production. Under the optimum conditions, about 95.42% of FAEE yield was achieved in 30 h. In addition, the lipase‐based static emulsions presented good reusability, and the FAEE yield remained at more than 70.63% after 15 successive reaction cycles. The lipase‐based static emulsions were also used to catalyze the transesterification of jatropha oil and cottonseed oil with ethanol for biodiesel production, and the maximum FAEE yield was 96.10% and 90.39%, respectively. CONCLUSIONS Lipase‐based static emulsions were developed as robust biocatalysts by trapping an aqueous solution of lipase in silicone microspheres. The lipase‐based static emulsions catalyzed process may be a suitable technique for biodiesel production. © 2016 Society of Chemical Industry

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Optimization and kinetic study on the synthesis of palm oil ester using Lipozyme TL IM

Cited by 52 publications

References 27 publications

Determinação Da Energia De Ativação Na Produção De Acetato De Eugenila via Catálise Heterogênea

Determinação Da Energia De Ativação Na Produção De Acetato De Eugenila via Catálise Heterogênea

Heterogeneous biocatalytic processes of vegetable oil interesterification to biodiesel

Lipase based static emulsions as efficient biocatalysts for biodiesel production

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