芘在不同溶剂中的诱导期与晶习  

Induction Time and Crystal Habit of Pyrene in Different Solvents

作　　者：于秋硕[1] 马晓迅[1] 

机构地区：[1]西北大学化工学院,陕北能源先进化工利用技术教育部工程研究中心,陕西洁净煤转化工程技术研究中心,陕西西安710069

出　　处：《化学反应工程与工艺》2012年第4期371-374,379,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(21106110)

摘　　要：采用目测法测10℃下,芘在甲醇、乙醇、正丙醇、异丙醇、甲苯和丙酮等6种溶剂中不同过饱和度下的诱导期。结果表明:芘在这些溶剂中的诱导期比较短,当过饱和度大于1.2,诱导期一般小于500 s;在低过饱和度下以非均相成核为主,在高过饱和度下以均相成核为主。不同溶剂中析出的晶习均为菱形块状晶体,且晶体晶型一致,可见上述几种溶剂对芘不同晶面的生长速率影响不大。The induction time of pyrene in methanol, ethanol, 1-propanol, 2-propanol, toluene and acetone respectively, was measured by visual observation at 10 ℃ under different super-saturated conditions. The results showed that induction time of pyrene was relatively short in these solvents, less than 500 s when supersaturation（S） was more than 1.2. Heterogeneous nucleation dominated at low supersaturation. On the contrary homogeneous nucleation dominated at high supersaturation. The crystal habits growing from different solvents were all rhomboidan like, and they had identical crystal structured. All these indicated that solvents had little influence on the main face growth ofpyrene crystal.

关 键 词：芘 结晶 诱导期 晶习 

分 类 号：TQ420.1[化学工程]