夹带剂性质对超临界二氧化碳萃取的影响  

Effects of the property of modifiers on supercritical CO_2 extraction

作　　者：段先志[1] 夏红英[1] 罗平[1] 

机构地区：[1]江西科技师范学院应用化学系,江西南昌330013

出　　处：《日用化学工业》2004年第1期40-43,共4页China Surfactant Detergent & Cosmetics

摘　　要：介绍了夹带剂在超临界CO2萃取中的作用和原理,分析了夹带剂分子极性、相对分子质量、分子体积及特殊分子结构等性质对超临界CO2萃取的影响,总结出夹带剂性质对萃取率的变化规律:夹带剂的分子极性越大,溶质在超临界CO2中的溶解度越大;夹带剂的相对分子质量、分子体积的增大,其在超临界CO2中的溶解度减小,萃取率减小;夹带剂中易形成氢键的特殊分子结构,可提高萃取率。The effect and principle of the modifiers on the supercritical CO_2 extractionwere introduced and the impact of the property of modifiers(molecular polarity?molecular weight?molecular physical volume)on the supercritical CO_2 extraction were analyzed.The profile of extraction yield against property of the modified can be summarized as:The higer the polarity of the modifier,the higher solubility of solute in supercritical CO_2.Increase of molecular and/or molecular physical volume will result-in decreasc of solubility of solute in supercritical CO_2 and consequently the decrease of the extraction yield.In case the modifier contains special molecular structure that facilitates the formation of hydrogen bond,the extraction yield will increase.

关 键 词：夹带剂 超临界二氧化碳 萃取率 分子极性 扩散系数 溶剂 溶解度 溶解能力 

分 类 号：O658.2[理学—分析化学]