阿魏酸和川芎嗪在超临界CO_2中溶解度的测定

The Measurement of the Solubility of Ferulic Acid and Tetramethylpyrazine in Supercritical Carbon Dioxide

采用动态法分别测定了阿魏酸和川芎嗪在超临界CO2中的溶解度.实验结果表明:在压力10～35MPa和温度308.15～338.15K范围内,阿魏酸在超临界CO2中的溶解度(摩尔分数)为6.936×10(7～26.527×10(7;在压力10～30MPa和温度318.15～338.15K范围内,川芎嗪在超临界CO2中的溶解度(摩尔分数)为0.010～0.131.阿魏酸在超临界CO2中的溶解度随着压力的增加而增大;温度对阿魏酸溶解度的影响较为复杂,出现了交迭压力行为.而川芎嗪在超临界CO2中的溶解度在实验范围内没有出现交迭压力行为.采用Chrastil方程分别对阿魏酸和川芎嗪在超临界CO2中的溶解度数据进行了关联,其AARD值分别为12.92%和4.23%.

The solubilities of ferulic acid and tetramethylpyrazine in supercritical carbon dioxide （SC-CO2） were measured by a dynamic method. The experimental results show that the solubilities （mole fraction） of ferulic acid and tetramethylpyrazin in SC-CO2 are from 6.936×10^-7 to 26.527×10^-7 and from 0.010 to 0.131, respectively. The solubilities of ferulic acid increase with increasing pressure at constant temperatures. The effect of temperature on the solubility of ferulic acid shows the crossover pressure behavior. However, the solubilities of tetramethylpyrazine do not show this behavior in the investigated ranges. The experimental solubility data of ferulic acid and tetramethylpyrazine were correlated by Chrastil equation, and the average absolute relative deviations （AARDs） are 12.92% and 4.23% respectively.