期刊
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
卷 170, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2021.108659
关键词
Solvent extraction; Soybean oil; Ethanol; Minimum solvent flow rate; Number of theoretical stages
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq [426913/2018-3, 308924/2017-7, 406963/2016-9, 302225/2019-6, 307398/2019-6]
- Fundacao de Amparo a` Pesquisa do Estado de Sao Paulo-FAPESP [2014/21252-0, 2016/10636-8, 2018/13207-6]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES [001]
The use of ethanol as a safer alternative to hexane in vegetable oil extraction shows promise, although further research is needed to optimize its use in large-scale continuous operations.
The replacement of toxic organic solvents from fossil sources by nontoxic ones from biorenewable origin in largescale processes has been a frequent search. Although ethanol has been currently investigated as a hexanesubstitute for vegetable oils extraction, most studies are conducted on laboratorial scale and in batch assays. Initial parameters of a continuous and countercurrent extractor that indicates the technical possibility of a largescale operation are still scarce. Here, a continuous extractor composed of fixed bed columns connected in series (resembling the so-called simulated moving bed extractor) for soybean oil extraction with anhydrous ethanol was experimentally reproduced by a multiple-batch solid-liquid extraction system. After a 5-stage extraction, the residual oil in the solid phase was 0.17% with 99.2% extraction yield, confirming that ethanol was capable to exhaust the solid matrix with a reasonable extraction yield. Although the minimum solvent-to-feed ratio (S/F) for ethanol (S/F = 2.62/1) was higher than that for hexane (S/F = 0.36/1), benefits in relation to food safety, reduction in handling danger, and less environmental impact reinforce ethanol as a safe and promising solvent for the extraction of vegetable oils in a continuous equipment.
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