Pilot Scale Extraction and Fractionation of Rice Bran Oil Using Supercritical Carbon Dioxide
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- 作者：Zhiping Shen ; Martin V. Palmer ; Simon S. T. Ting ; and Robert J. Fairclough
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：1997
- 出版时间：December 1997
- 年：1997
- 卷：45
- 期：12
- 页码：4540 - 4544
- 全文大小：108K
- 年卷期：v.45,no.12(December 1997)
- ISSN：1520-5118
文摘
In the first stage of this two-stage process, crude rice bran oil wasextracted with supercritical carbondioxide (SC-CO2) from a 300 g batch of rice bran.Oil-laden SC-CO2 from the extractor (24.1MPa/40 
C) passed continuously to a second-stage column where an oil phase(raffinate) separated fromthe SC-CO2 at various controlled temperatures andpressures. Measurement of the compositionsof raffinates and extracts allowed calculation of partitioncoefficients of triglycerides, free fatty acids(FFAs), 
-tocopherol, sterols, and oryzanol and, hence, theselectivities of the fractionations.Fractionation removed almost all water and reduced the FFAconcentration in raffinate by up to50%. Oryzanol and -tocopherol concentrations in the raffinatewere not reduced by fractionation,but the sterol concentration was reduced under conditions favoring FFAremoval. Under the flowrate conditions studied (3.5 kg of CO2/h), thefractionations could be described by equilibria betweenoil and CO2 phases.Keywords: Supercritical carbon dioxide; extraction; fractionation; ricebran oil
C) passed continuously to a second-stage column where an oil phase(raffinate) separated fromthe SC-CO2 at various controlled temperatures andpressures. Measurement of the compositionsof raffinates and extracts allowed calculation of partitioncoefficients of triglycerides, free fatty acids(FFAs), -tocopherol, sterols, and oryzanol and, hence, theselectivities of the fractionations.Fractionation removed almost all water and reduced the FFAconcentration in raffinate by up to50%. Oryzanol and -tocopherol concentrations in the raffinatewere not reduced by fractionation,but the sterol concentration was reduced under conditions favoring FFAremoval. Under the flowrate conditions studied (3.5 kg of CO2/h), thefractionations could be described by equilibria betweenoil and CO2 phases.Keywords: Supercritical carbon dioxide; extraction; fractionation; ricebran oil