苦荞活性组分在SC-CO2/CH3OH中无限稀释扩散系数的测定及计算  

Determination and calculation of infinite diffusion of active components from tartary buckwheat in SC-CO2/CH3OH system

作　　者：吕惠生[1] 翟子玮 王智 周锦怡 张佳 耿中峰[1] LYU Hui-sheng;ZHAI Zi-wei;WANG Zhi;ZHOU Jin-yi;ZHANG Jia;GENG Zhong-feng(Key Laboratory for Green Chemical Technology of Ministry of Education,R&D Center for Petrochemical Technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学石油化工技术开发中心教育部绿色合成与转化重点实验室,天津300072

出　　处：《高校化学工程学报》2020年第2期302-310,共9页Journal of Chemical Engineering of Chinese Universities

摘　　要：为了测定苦荞活性组分(芦丁与山奈酚-3-O-芸香糖苷)在超临界二氧化碳-甲醇(SC-CO2/CH3OH)体系中的无限稀释三元扩散系数,采用色谱峰扩展法在温度为308.15~323.15K,压力为8~14MPa进行实验,考察了压力、温度、密度及夹带剂等因素对扩散系数的影响规律,结果表明三元扩散系数随压力、密度及夹带剂质量分数的升高而减小,随温度的升高而增大。分别采用了修正的Wilke-Chang、He-1997及Dymond-Hildebrand-Batschinski模型对相关溶质分子在SC-CO2/CH3OH中的三元扩散系数进行理论关联及预测,计算结果与实验数据比较发现,Dymond-Hildebrand-Batschinski模型的预测效果最佳,芦丁与山奈酚-3-O-芸香糖苷组分的平均绝对偏差分别为2.48%和3.71%。In order to determine the infinite diffusion coefficients of active components from tartary buckwheat(rutin and kaempferol-3-O-rutinoside)in the supercritical carbon dioxide-methanol(SC-CO2/CH3 OH)system,peak extension chromatography was adopted under 308.15~323.15 K and 8~14 MPa.The effects of pressure,temperature,density and modifier content were investigated.The results show that the diffusion coefficient decreases with the increase of pressure,density and modifier content,while it increases with the rise of temperature.In addition,the models of modified Wilke-Chang,He-1997 and Dymond-Hildebrand-Batschinski were used to predict the diffusion coefficients of rutin and kaempferol-3-O-rutinoside.Compared with the experimental results,the mean absolute deviations of rutin and kaempferol-3-O-rutinoside computed by the Dymond-Hildebrand-Batschinski model are 2.48%,3.71%,respectively,which shows the best prediction.

关 键 词：芦丁 山奈酚-3-O-芸香糖苷 超临界CO2-甲醇 扩散系数 模型预测 

分 类 号：TQ28[化学工程—有机化工]