利用混合二元酸合成混合酸二甲酯和聚酯多元醇的研究  

Study on the Synthesis of Mixed Dimethyl Esters and Polyester Polyol with Mixed Dibasic Acids

作　　者：单婷婷[1] 邓剑如[1] 雷贝[1] 蒋卫和 屈铠甲 

机构地区：[1]湖南大学化学化工学院,湖南长沙410072 [2]岳阳昌德化工有限公司,湖南岳阳414003

出　　处：《河南化工》2007年第8期26-28,共3页Henan Chemical Industry

摘　　要：以工业副产物C4～C6混合二元酸为原料，采用传统催化剂浓硫酸合成混合酸二甲酯（DBE），确定了最优工艺条件：以100g混合二元酸为基准，浓硫酸用量2mL，回流分水3．5h，醇酸比5：1，带水剂甲苯50mL，酯化后反应液在70～80℃下搅拌10min条件下用Na2CO3溶液洗涤。在此条件下产品酸值小于1mgKOH／g，其中混合二元酸二甲酯含量大于95％，平均产率为86．3％，质量稳定。自制DBE和1，4一丁二醇在钛酸四正丁酯催化作用下可合成聚氨酯用聚酯多元醇，分子量在800—2000可控。Mixed dimethyl esters are synthesized with by - product C4 - C6 mixed dibasic acids by the traditional catalyst of sulfuric acid. The optimal conditions are found as follows： mixed dibasic acids 100 g, sulfuric acid 2 mL, refluxing and water segregating for 3.5 h, molar ratio of alcohol to acid 5 ： 1, toluene 50 mL. After reaction the mixed solution is washed by aqueous Na2CO3 at 70 - 80 ℃ with stirring. Under the optimal condition, the acid value of the product is below 1 mg KOH/g, the content of mixed dimethyl esters is above 95%, the average yield is 86.3% and the quality is steady. Polyester polyol （molecular weight 800 -2 000） could be made by self- made DBE and 1,4- butanediol with tetrabutyl titanate as catalyst.

关 键 词：C4~C6混合二元酸 酯化 混合酸二甲酯 聚酯多元醇 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]