熔融结晶分离精制2,5-二甲酚  

Separation and purification of 2,5-xylenol by melting crystallization

作　　者：张金峰[1] 沈寒晰[1] 黄方方[1] 白燕[1] 郑阿龙 ZHANG Jin-feng;SHEN Han-xi;HUANG Fang-fang;BAI Yan;ZHENG A-long(Shaanxi Research and Design Institute of Petroleum and Chemical Industry,Shaanxi Key Laboratory of Petroleum for Fine Chemicals,Xi’an 710054,China)

机构地区：[1]陕西省石油化工研究设计院陕西省石油精细化学品重点实验室,陕西西安710054

出　　处：《应用化工》2021年第12期3333-3335,共3页Applied Chemical Industry

基　　金：2018年陕西省重点项目(2018ZDXM-GY-162)。

摘　　要：采用熔融结晶分离提纯2,5-二甲酚,考察结晶终温、降温速率、发汗终温对结晶的影响。优化的精制工艺参数为:将物料在熔融状态73℃恒温20 min,按温度控制曲线进行操作,降温速率以3℃/h降温10 h;结晶终温43℃,恒温20 min;然后以3℃/h升温10 h,发汗终温70℃;恒温20 min,最后快速升温至78℃,收集样品,得到含量达99.5%的2,5-二甲酚产品,收率达76.3%。2,5-Xylenol was purified by melt crystallization,the effects of crystallization final temperature,cooling rate and sweating final temperature on crystallization were investigated,the optimized refining process parameters were as follows:the material was kept at 73℃for 20 min in the melting state,and operated according to the temperature control curve,the cooling rate was 3℃/h for 10 h;Crystallization final temperature 43℃,constant temperature 20 min;Then the samples were heated at 3℃/h for 10 h,and the final sweating temperature was 70℃;The product was collected at a constant temperature of 20 min and heated up to 78℃,the content of 2,5-xylenol can reach 99.5%,in addition the yield of 2,5-xylenol can reach 76.3%.

关 键 词：2 5-二甲酚 精制 熔融结晶 

分 类 号：TQ243[化学工程—有机化工] TQ522