摘要
介绍了以混合二元酸、甲醇为原料,采用阳离子交换树脂NKC-9为催化剂,经预酯化和连续酯化制备混酸二甲酯,结果表明：当m（NKC-9催化剂）∶m（混合二元酸）=8％时,混合二元酸预酯化转化率大于70％.其连续酯化后转化率及总转化率分别大于90％和97％.最佳反应条件为：预酯化∶m（催化剂）∶m（混合二元酸）=8％,n（甲醇）∶n（混合二元酸）=2.5∶1,反应温度80～85℃,反应时间3 h;连续酯化∶液体空速0.37～1.47 h1,n（甲醇）∶n（预酯化产物）＞25.14.
This text introduced that dibasic esters（DBE） were prepared by using mixed dibasic acids （DBA） and methanol as raw materials and NKC-9 as catalyst through pre-esterification and continuous esterification. The result showed that when the amount of NKC-9（calculation by mixed dimethyl me- ter,mass fraction） is 8%,the conversion rate of mixed dimethyl esters pre-esterification is more than 70% and continuous esterification conversion rate is more than 90%and general conversion rate is more than 97%. The optimal reaction conditions are that pre-esterification： the amount of catalyst 8% n（methanol） ： n（mixed dimethyl acid）=2. 5 ： 1; reaction temperature. 80-85 ℃ reaction time 3 hl continuous esterification.liquid space velocity 0. 37-1.47 h-1 ;mole ratio of alcohol〉25.14.
出处
《化工科技》
CAS
2013年第6期20-22,38,共4页
Science & Technology in Chemical Industry
基金
中国石油天然气股份有限公司辽阳石化公司资助项目(K200908)
关键词
混合二元酸
甲醇
混酸二甲酯
预酯化
连续酯化
Mixed dibasic acids
Methanol
Mixed dimethyl esters
Pre-esterification
Continuous esterifieation
