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状态方程法预测胆固醇在高压CO_2与溶剂混合物中的溶解度

Solubility estimation of cholesterol in the mixture of organic solvent and high pressure CO_2 by equation of state
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摘要 超临界造粒技术操作方式及条件确定的关键在于得到固体物质在CO_2与溶剂混合物中的溶解度数据。选用胆固醇为模型固体物质,以丙酮和乙醇为溶剂,在291.15~353.15 K温度范围内,采用两种混合规则(vdw-1和vdw-2)的Peng-Robinson状态方程(PR-EOS)分别描述CO_2-丙酮气液相平衡和308.15 K及318.15 K时CO_2-胆固醇气固相平衡。根据文献中已报道的相平衡数据拟合出最优的相互作用参数,在该相互作用参数下,气液相平衡中气相组分的平均相对偏差小于3.4%,气固相平衡中气相组分的平均相对偏差小于7.0%。根据上述结果,选用合适的相互作用参数计算CO_2-丙酮-胆固醇及CO_2-乙醇-胆固醇气液固三元相平衡,计算结果显示,预测得到胆固醇在高压CO_2与溶剂混合物中的溶解度与实验测得值相比偏差较小,可以为超临界造粒技术及超临界萃取分离技术提供热力学判据。 超临界造粒技术操作方式及条件确定的关键在于得到固体物质在CO<sub>2</sub>与溶剂混合物中的溶解度数据。选用胆固醇为模型固体物质,以丙酮和乙醇为溶剂,在291.15~353.15 K温度范围内,采用两种混合规则(vdw-1和vdw-2)的Peng-Robinson状态方程(PR-EOS)分别描述CO<sub>2</sub>-丙酮气液相平衡和308.15 K及318.15 K时CO<sub>2</sub>-胆固醇气固相平衡。根据文献中已报道的相平衡数据拟合出最优的相互作用参数,在该相互作用参数下,气液相平衡中气相组分的平均相对偏差小于3.4%,气固相平衡中气相组分的平均相对偏差小于7.0%。根据上述结果,选用合适的相互作用参数计算CO<sub>2</sub>-丙酮-胆固醇及CO<sub>2</sub>-乙醇-胆固醇气液固三元相平衡,计算结果显示,预测得到胆固醇在高压CO<sub>2</sub>与溶剂混合物中的溶解度与实验测得值相比偏差较小,可以为超临界造粒技术及超临界萃取分离技术提供热力学判据。
出处 《化工进展》 EI CAS CSCD 北大核心 2011年第S2期11-14,共4页 Chemical Industry and Engineering Progress
基金 国家自然科学基金(20676118 20776139)
关键词 状态方程 超临界CO<sub>2</sub> 溶解度 胆固醇 equation of state supercritical carbon dioxide solubility cholesterol
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参考文献10

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