Entrainer effect of water on supercritical fluid extraction of natural puroducts

水对天然产物超临界流体萃取的夹带剂作用

基本信息

批准号：
12650758
负责人：
IWAI Yoshio
金额：
$ 2.37万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

项目摘要

The solubilities of palmitic acid in supercritical carbon dioxide and supercritical carbon dioxide + water were measured by using the static recirculation method combined with on-line FTIR spectroscopy at 313.2 K and 15.0 MPa. The solubilities of palmitic acid in supercritical carbon dioxide increased with increasing molarity of water, and especially, the solubilities sharply increased near the saturated point of water. The solubility of palmitic acid in supercritical carbon dioxide saturated with water was found to be 160% larger than that in supercritical carbon dioxide. The C=O stretching bands of palmitic acid were investigated. The molarities of palmitic acid monomer and dimer were independent of the concentration of water. The molarities of palmitic acid monomer interacting with water increased with increasing molarity of water. On the average, one palmitic acid molecule probably interacts about six associated molecules of water in supercritical carbon dioxideThe solubilities of caffeine in supercritical carbon dioxide and supercritical carbon dioxide + water were measured by the same method at 313.2 K and 15.0 MPa. The solubility caffeine of in supercritical carbon dioxide saturated with water was found to be 18% larger than that in supercritical carbon dioxide. The shapes of the peaks for caffeine measured with FTIR spectroscopy did not change by addition of water. It can be considered that caffeine and water do not make special interaction species.

棕榈酸在超临界二氧化碳和超临界二氧化碳 +水中的溶解度通过使用静态再循环方法与313.2 K和15.0 MPa的在线FTIR光谱结合进行测量。棕榈酸在超临界二氧化碳中的溶解度随水的摩尔度增加而增加，尤其是在水饱和点附近的溶解度急剧增加。发现棕榈酸在用水饱和的超临界二氧化碳中的溶解度比超临界二氧化碳大160％。研究了棕榈酸的C伸展带。棕榈酸单体和二聚体的摩尔性与水的浓度无关。棕榈酸单体与水相互作用的摩尔性随水的摩尔性增加而增加。平均而言，一个棕榈酸分子可能在超临界碳二氧化碳中的六个相关分子相互作用，在超临界二氧化碳和超临界二氧化碳 +水中的咖啡因溶解度在313.2 K和15.0 MPA时通过同一方法测量。发现用水饱和的超临界二氧化碳中的溶解性咖啡因比超临界二氧化碳中的咖啡因大18％。用FTIR光谱法测得的咖啡因峰的形状不会因加水而改变。可以认为咖啡因和水不产生特殊的相互作用物种。