Extraction of Polyunsaturated Fatty Acid Ethyl Esters from Aqueous Silver Nitrate Solution using Supercritical Ethane and Ethylene and Modeling of the Extraction Process.

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  • 超臨界エタン，エチレンによる硝酸銀水溶液中の高度不飽和脂肪酸エチルエステルの抽出，および抽出過程のモデル化
  • チョウリンカイ エタン エチレン ニ ヨル ショウサン ギン スイヨウエキチュ

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Abstract

Extraction of polyunsaturated fatty acid ethyl esters (PUFA-Et) from aqueous silver nitrate solution was studied using supercritical (SC) ethane and ethylene and the extraction behaviors were compared with those of SC-CO2 extraction. For the SC-ethane extraction, PUFA esters were extracted faster than in SC-CO2 extraction. The concentration change for extracted PUFA esters was similar to that of CO2, and efficient DHA-Et separation was realized. The results of SC-ethylene extraction showed that the extraction rate was the fastest in the three kinds of supercritical fluids used and that SC-ethylene had little selectivity for the PUFA esters. This is because ethylene tends to form π-complex with Ag ion competitively.<BR>Modeling of the semi-batch extraction process was carried out utilizing a simple mass balance relationship. All experimental extraction curves were successfully represented by this model with optimizing of apparent equilibrium constants.

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