川芎油在超临界二氧化碳中溶解度的测定与关联.pdfVIP

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川芎油在超临界二氧化碳中溶解度的测定与关联.pdf

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川芎油在超临界二氧化碳中溶解度的测定与关联.pdf

Chinese J. Chem. Eng. , 13 (6) 796 …799 (2005) Measurement and Correlation of the Solubility of Ligusticum Chuanæiong oil in Supercritical CO * 2 SUN Yongyue(孙永跃)a， b and LI Shufen(李淑芬)a，忡 a Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering Technology, Tianjin University,Tianjin 300072 , Chína b Tíanjín Munícipal Instítute for Drug Control , Tíanjín 300070 , China Abstract 巴xtractíon of the Ligωticum Ch阳nxio昭oil with s呻ercritical CO2 (8C-C02) was investigated at the 0 temperatures ranging from 55吧 to 70 C and pressure from 25 MPa to 35 MPa. The mass of Ligusticum Chuanxiong oil extracted increased with pressure at const. ant temperature. The initial slope of the extraction was considered as the solubility of oil in 8C嗣 C02. Chrastil equation was used to correlate the solubilíty data of Ligusticum Chuanxiong oìl. An improved Chrastil equation was a150 presented and was employed to correlate the solubility data. The correlation results show that the values of the average absolute relative deviation are 5.94 % and 3.33% respectively, indicating the improved version has better correlation accuracy than that of Chrastil equation. Keywords supercritical C02 extraction , solubility, Ligusticum Chuanxiong oil ,correlation 1 INTRODUCTION percritical CO2 (SC-C02) is considered as environ- The root of Ligusticum Chuanxiong Hort is one mentally friendly solvent because of its low critical of the m