超临界流体萃取天然产物的多级全混流模型  

Multi-stage Totally Mixed Flow Model for Supercritical Fluid Extraction of Natual Products

作　　者：范治国[1] 李琳[2] 胡松青[2] 范定国[3] 

机构地区：[1]广东省贸易职业技术学校,广东广州510507 [2]华南理工大学轻工与食品学院,广东广州510640 [3]山西省国税局信息中心,山西太原030002

出　　处：《广东化工》2008年第7期37-41,共5页Guangdong Chemical Industry

基　　金：广东省关键领域重点突破项目(2003A30908);广东省科技攻关项目(2003C104025);华南理工大学高水平大学建设项目

摘　　要：文章基于超临界流体萃取天然产物的柱塞流模型,推导出了通用性强且易求解的多级全混流模型,确定全混层数n、分配系数Γ和特征萃取时间Θ为影响萃取过程的三个主要参数。通过对模型的数值求解结果及参数敏感性分析表明,在文章参数选择范围内,即Γ>0.004、Θ>0.5的范围内,柱塞流模型可以近似地由n=10的多级全混流模型代替。The multi-stage totally mixed flow mathematical model was established for supercritical fluid extraction of natural products based on plug flow model, and the model was solved numerically as well. Three parameters, n, the number of mixed flow stage, Г, the dimensionless partition coefficient, and O, the dimensionless characteristic time were the most important parameters affecting the extraction. It was indicated with the parameter sensitivity analysis and numerical solution that in the selected parameter value range, i.e. Г〉0.004 and θ〉0.5, the multi-stage totally mixed flow model can be seemed as reaching plug flow approximately.

关 键 词：超临界流体萃取 多级全混流模型 过程模拟 

分 类 号：TQ028.32[化学工程] O626.32[理学—有机化学]