微通道反应器合成DBT连续工艺研究  

Research on Continuous Process of DBT Synthesis in Microchannel Reactor

作　　者：李显辉 王开林 Li Xianhui;Wang Kaiin(Sinopec China Tianjin branch,Tianjin 300270,China)

机构地区：[1]中石化(天津)石油化工有限公司,天津300270

出　　处：《广东化工》2024年第12期111-112,103,共3页Guangdong Chemical Industry

摘　　要：传统的对苯二甲酸二丁酯(DBT)制备工艺需要使用催化剂,工艺相对繁琐且经济成本略高。本研究开发利用微通道反应器,以对苯二甲酸(PTA)和正丁醇为原料,在高温高压条件下不使用催化剂直接制备出对苯二甲酸二丁酯。通过考察反应温度、反应压力、停留时间、醇酸比等反应条件,最终确定最佳酯化产物收率工艺条件。最佳工艺条件在反应温度350℃左右、反应压力15 MPa、反应停留时间13 min、醇酸比20∶1时原料PTA一次酯化转化率达到99.13%,目标产物DBT收率达到82.83%;二次酯化原料转化率达到99.40%,目标产物收率达到90.12%。The traditional preparation process of dibutyl terephthalate(DBT)requires the use of catalysts,which is relatively complicated and has a high economic cost.In this study,a microchannel reactor was developed to directly prepare dibutyl terephthalate from terephthalic acid(PTA)and n-butanol at high temperature and high pressure without using catalyst.By investigating the reaction conditions,such as reaction temperature,reaction pressure,residence time,ratio of alcohol to acid,the optimum process conditions of esterification product yield were finally determined.The optimum technological conditions are as follows:reaction temperature is about 350℃,reaction pressure is 15 MPa,reaction residence time is 13 min,and the ratio of alcohol to acid is 20∶1.The primary esterification conversion of PTA reaches 99.13%,and the yield of target product DBT reaches 82.83%.The conversion rate of secondary esterification raw materials reached 99.40%,and the yield of target products reached 90.12%.

关 键 词：微通道 DBT合成 连续酯化 最佳工艺条件 

分 类 号：TQ[化学工程]