C_(21)二元酸的研制

Preparation of C21 Dicardoxylic Acid

C_(21)二元酸是近年来国外发展很快的一种性能优良的多官能团物质,它的金属盐、胺盐、(月先)胺等衍生物均具有良好的溶解性和助溶能力,可广泛用于油墨、润滑剂、树脂、乳化剂等.本文以液体油酸为原料,在0.1～0.5%(脂肪酸重)碘催化下,与26%的丙烯酸在220～250℃反应1～3小时后得到粗制品,经甲酯化、减压蒸馏皂化进行了定性分析,可初步肯定是C_(21)二元酸产品.

The C21 olibasic acid is an excelleat multi functional Substance which is developing fastly in American and in Japem.This componnd and their various derivatives have many unique characteristics,Therefore,it is used extensively in the print,coating,resin,lubricant and emulsitfer etc.This study uses separated liquid phase of fatly acids forming the vegetable oil as the raw material,C21 dibasic acid is produced by reacting this liqudl fatty acid with 20%aerylic acid for 1 to 3 hours in the presence of a catalyst(0.1-0.5%liquid I2)at 220-250℃and purifing This Crude product through este-rification which CH3OH.distillation in Vacuum,Saponification and acid hydrolysis.The pure product prepared by aboe procedures is identified by determining Physical Constant and by Gas-liquid chromatography It is assumed primarily that the pure product is C21 dibasic acid.