Supercritical fluids technology for clean biofuel production

Wen, Dongsheng; Jiang, Hao; Zhang, Kai

doi:10.1016/j.pnsc.2008.09.001

Cited by 157 publications

(71 citation statements)

References 56 publications

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“…van Kasteren and Nisworo (2007) described a conceptual design of a production process in which waste cooking oil is converted via supercritical transesterification with methanol to methyl esters (biodiesel) at industrial scale and concluded that supercritical transesterification can be scaled up to yield high purity methyl esters (99.8%) and almost pure glycerol with added advantages of elimination of pretreatment related capital and operating costs. Wen et al (2009) presented a review on supercritical fluid technology for biodiesel production indicating some prominent merits which the SCF technology possesses that includes fast kinetics, high fuel production rate, ease of continuous operation and elimination of the necessity of catalysts. They added that the harsh operation environment, i.e.…”

Section: Time (H)mentioning

confidence: 99%

Different techniques for the production of biodiesel from waste vegetable oil

Refaat

2009

Int. J. Environ. Sci. Technol.

280

118

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ABSTRACT:The production of biodiesel from waste vegetable oil offers a triple-facet solution: economic, environmental and waste management. The new process technologies developed during the last years made it possible to produce biodiesel from recycled frying oils comparable in quality to that of virgin vegetable oil biodiesel with an added attractive advantage of being lower in price. Thus, biodiesel produced from recycled frying oils has the same possibilities to be utilized. While transesterification is well-established and becoming increasingly important, there remains considerable inefficiencies in existing transesterification processes. There is an imperative need to improve the existing biodiesel production methods from both economic and environmental viewpoints and to investigate alternative and innovative production processes. This study highlights the main changes occurring in the oil during frying in order to identify the characteristics of oil after frying and the anticipated effects of the products formed in the frying process on biodiesel quality and attempts to review the different techniques used in the production of biodiesel from recycled oils, stressing the advantages and limitations of each technique and the optimization conditions for each process. The emerging technologies which can be utilized in this field are also investigated. The quality of biodiesel produced from waste vegetable oil in previous studies is also reviewed and the performance of engines fueled with this biodiesel and the characteristics of the exhaust emissions resulting from it are highlighted. The overarching goal is to stimulate further activities in the field.

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Section: Time (H)mentioning

confidence: 99%

Different techniques for the production of biodiesel from waste vegetable oil

Refaat

2009

Int. J. Environ. Sci. Technol.

280

118

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“…The transesterification of vegetal oils using an alcohol at supercritical conditions comprises a method used to produce biodiesel and has gained growing interest due to the benefits related to the environment and quality of the fuel generated (DEMIRBAS, 2002;SAKA, 2001;MADRAS et al, 2004;PINNARAT;SAVAGE, 2008;WEN et al, 2009). According to the current literature, catalyst-free alcoholysis reactions at high temperature and pressure conditions provide improved phase solubility, decrease mass-transfer limitations, afford higher reaction rates and make the separation and purification steps of the products easier.…”

Section: Introductionmentioning

confidence: 99%

Continuous production of fatty acid ethyl esters from soybean oil at supercritical conditions

et al. 2012

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ABSTRACT. This work reports the production of fatty acid ethyl esters (FAEE) from the transesterification of soybean oil in supercritical ethanol in a continuous catalyst-free process using different reactor configurations. Experiments were performed in a tubular reactor in one-step reaction and experimentally simulating two reactors, one operated in series and the other a recycle reactor. The reaction products were analyzed for their content of residual triglycerides, glycerol, monoglycerides, diglycerides, ethyl esters and decomposition. Results show that the configurations studied with intermediate separation of glycerol afford higher conversions of vegetable oil to their fatty acid ethyl esters derivatives when compared to the one-step reaction, with relatively low decomposition of fatty acids (< 5.0 wt%).Keywords: supercritical method, biodiesel, continuous process, non-catalytic transesterification.Produção contínua de ésteres etílicos de ácidos graxos do óleo de soja em condições supercríticas RESUMO. Este trabalho reporta a produção de ésteres etílicos de ácidos graxos a partir da transesterificação de óleo de soja em etanol supercrítico em um processo contínuo e não-catalítico utilizando diferentes configurações de reatores. Os experimentos foram realizados com a utilização um reator tubular em uma etapa reacional e com a simulação experimental de dois reatores operando em série um reator com reciclo. Os produtos das reações foram analisados em relação ao teor de triglicerídeos, glicerol, monoglicerídeos, diglicerídeos, ésteres etílicos e decomposição. Os resultados obtidos mostram que as configurações estudadas com remoção intermediária de glicerol apresentaram elevadas conversões do óleo vegetal em seus respectivos ésteres etílicos, quando comparados ao processo em uma etapa reacional, com baixa decomposição de ácidos graxos (< 5,0%).Palavras-chave: método supercrítico, biodiesel, processo contínuo, transesterificação não catalítica.

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“…These systems are environmentally benign, and have good scalability, as well as being simple and easy for continuous production. The SCFs is ideal for separation and extraction of useful products and for oxidation of organic materials [32]. For most of the supercritical methods of biodiesel production, the reaction requires temperatures of 340-400 °C and pressures of 20-70 MPa.…”

Section: Supercritical Processmentioning

confidence: 99%