Microwave assisted transesterification of rapeseed oil

Azcan, N.; Danisman, Aysegul

doi:10.1016/j.fuel.2007.12.004

Cited by 166 publications

(76 citation statements)

References 12 publications

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“…Embora acreditemos que o NaoH ou KoH não tenham grande futuro no médio e longo prazo, para uma produção industrialmente competitiva, em 2008, das publicações que envolvem a reação de transesterificação, mais de uma dúzia de artigos empregaram NaoH e/ou KoH como catalisadores. 34,35,[53][54][55][56][57][58][59][60][61][62][63][64] Porém, em termos de reação de transesterificação e purificação do biodiesel, esses artigos, científica e industrialmente falando, não trazem contribuição significativa que possa melhorar a economicidade da produção ou alavancar o crescimento do uso massivo do biodiesel na matriz energética brasileira ou de outros países.…”

Section: Processo Industrial Catálise Alcalina E Catálise áCidaunclassified

“…Considerando que a reação com NaoCH 3 em duas etapas pode levar apenas alguns minutos, o uso da NaoH ou KoH, aliado à irradiação de micro-ondas, com o objetivo de reduzir o tempo reacional, 53,54 não representa vantagem operacional nenhuma em relação ao uso de aquecimento convencional, que justifique o scale-up para o seu uso na indústria.…”

Section: Processo Industrial Catálise Alcalina E Catálise áCidaunclassified

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Biodiesel: visão crítica do status atual e perspectivas na academia e na indústria

Dabdoub¹,

Bronzel²,

Rampin³

2009

Quím. Nova

104

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Recebido em 27/2/09; aceito em 31/3/09; publicado na web em 7/4/09 BioDiESEL: A CRiTiCAL oVERViEW oN THE CURRENT STATUS AND PERSPECTiVES AT THE ACADEmY AND iNDUSTRY. This article presents a bibliographic review of research carried out on different alternative processes for biodiesel production. The supercritical and subcritical (non catalytic) reaction conditions, the use of solid basic, solid acid and other heterogeneous catalysts, including the use of immobilized enzymes and whole-cell catalysts are also critically compared with the traditional homogeneous alkaline or acid catalysts that are common on industrial applications. Advantages and limitations of all these processes for the transference from the laboratory to the industry are discussed. A correlation of the chemical composition with the quality parameters of the produced biodiesel is done with aim to stablish adequate procedures for the right selection of the rawmaterial. Castor bean oil is used as an example of inappropriate oil in order to produce a B100 that fulfill all the international physicochemical quality standards. in this article are presented research results to adequate the values of viscosity, density and iodine number of the castor and soybean biodiesel to the international standard limits by means blending these both biodiesels at the right ratio.Keywords: transesterification; biodiesel; catalysts. introduÇãoAumento da demanda mundial por combustíveis líquidos, aquecimento global, segurança energética, vontade política por desenvolvimento nos campos agrícola, social e também energético são pontos que abrem novas áreas de interesse e oportunidades para pesquisas e desenvolvimento na Academia e na indústria, pois são as forças motoras responsáveis pelo renovado interesse na produção de biocombustíveis.Um dos grandes destaques da atualidade na área de biocombustí-veis é o interesse pelo uso de recursos naturais baseados em materiais lignocelulósicos 1-3 para a produção de etanol ou por fontes produtoras de lipídeos usados para a produção de biodiesel.Biodiesel é o nome dado a ésteres alquílicos de ácidos graxos desde que atendam certos parâmetros de qualidade. 4-8 Além de esses ésteres serem derivados de fontes biológicas como plantas e animais, atuam como combustível substituto ao diesel de petróleo, com desempenho muito próximo, não exigindo modificações nos motores. Tradicionalmente o biodiesel é produzido através das reações de transesterificação de triglicerídeos, usando geralmente catalisadores alcalinos, 9 ou da esterificação de ácidos graxos livres, sendo que neste último caso, os ácidos graxos livres (AGLs) são submetidos à reação direta com um álcool de 4 carbonos ou menos, na presença de catalisadores ácidos. 10-12 mais recentemente o uso de diversos catalisadores heterogêneos tem sido descrito na literatura. 13 Transesterificação é o processo de transformação de um éster carboxílico em outro, através da troca do grupo Ro -presente no éster original, por outro grupo semelhante proveniente de um álcool na presença de um catalisa...

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Section: Processo Industrial Catálise Alcalina E Catálise áCidaunclassified

Biodiesel: visão crítica do status atual e perspectivas na academia e na indústria

Dabdoub¹,

Bronzel²,

Rampin³

2009

Quím. Nova

104

View full text Add to dashboard Cite

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“…The use of microwaves provides many advantages as follows: fast startup time, faster heating, efficient energy and the lower process cost, easy to monitor, precise, selective heating and the better quality of the final product [7,8]. Microwave irradiation has been an alternative heating system in transesterification over the past few years [11]. As a result and short separation time have been obtained [8].…”

Section: Introductionmentioning

confidence: 99%

Production of Biodiesel from Coconut Oil Using Microwave: Effect of Some Parameters on Transesterification Reaction by NaOH Catalyst

Suryanto

Suprapto

Mahfud

2015

Bull. Chem. React. Eng. Catal.

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The purpose of this research was to study the effect of reaction time and NaOH catalyst in transesterification of coconut oil enhanced by microwave and to obtain a biodiesel. Reaction was conducted in batch reactor which equipped by microwave. Coconut oil contains saturated fatty acids about 70% with medium chain (C8-C14), especially lauric acid and myristic acid. The reaction was initiated by mixing oil and methanol with oil to methanol mole ratios of 1:3, 1:6, 1:9 and 1:12, catalyst concentration of 0.1, 0.15, 0.2, 0.25 and 0.3 wt.%, as well as setting electrical power at 100, 264 and 400 W. The reaction times were of 0.5, 1, 1.5, 2, 2.5, 3 and 3.5 min. The result showed that microwave could be employed as an energy source and was able to accelerate the transesterification process to produce biodiesel using NaOH catalyst. The biodiesel yields increase with increasing microwave power. The highest yield of biodiesel obtained was of 97.37% with reaction conditions set at 0.2 wt.% catalyst, a reaction time of 2 min, molar ratio of methanol to oil 1:9 and microwave power of 400 watt.

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“…Process intensifications of biodiesel production have been investigated by previous researchers, such as homogenous catalyst transesterification and esterification [4], heterogeneous base-catalyst [5], enzymatic transesterification [6], non-catalyst supercritical transesterification [7], microwave-assisted transesterification [8], and ultrasound-assisted esterification [1,[9][10][11]. Although these intensifications could improve yield and efficiency, several drawbacks were discovered.…”

mentioning

confidence: 99%

“…The use of non-catalytic supercritical transesterification has disadvantages in technical operation that may increase the cost of production [6]. Intensification to reduce processing time has also been attempted, using microwaves and ultrasound as power utilities [8][9][10][11]. It turned out that the yield of biodiesel produced by microwave-assisted transesterification was lower than by ultrasound-assisted production [10][11].…”

mentioning

confidence: 99%

Kinetic Study on Ultrasound Assisted Biodiesel Production from Waste Cooking Oil

Widayat

Aulia

Hadiyanto

et al. 2015

J. Eng. Technol. Sci.

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Abstract. The objective of this research was to study a kinetic model of biodiesel production from waste cooking oil assisted by ultrasound power. The model considered the biodiesel production process as a 2nd order reversible reaction, while its kinetic parameters were estimated using MATLAB, based on data extracted from Hingu, et al. [1]. The data represented experiments under low-frequency ultrasonic wave (20 kHz) and variations of temperature, power, catalyst concentration, and alcohol-oil molar ratio. Statistical analysis showed that the proposed model fits well to the experimental data with a determination coefficient (R 2 ) higher than 0.9.

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Microwave assisted transesterification of rapeseed oil

Cited by 166 publications

References 12 publications

Biodiesel: visão crítica do status atual e perspectivas na academia e na indústria

Biodiesel: visão crítica do status atual e perspectivas na academia e na indústria

Production of Biodiesel from Coconut Oil Using Microwave: Effect of Some Parameters on Transesterification Reaction by NaOH Catalyst

Kinetic Study on Ultrasound Assisted Biodiesel Production from Waste Cooking Oil

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