摘要
引言乳酸乙酯具有无毒、溶解性好、不易挥发、可生物降解等特点，是一种极具开发价值和应用前景的“绿色溶剂”．美国Argonne国家实验室利用渗透蒸发技术合成乳酸乙酯，获得第三届美国“总统绿色化学挑战年度奖”．日前国内外乳酸乙酯生产都是以浓硫酸为催化剂、用苯作带水剂，先进行催化酯化，再精馏分离的间歇分步法，上述工艺具有设备腐蚀严重、副产物多、工艺流程长、产品带有苯的异味等缺点，制约了其作为绿色溶剂的广泛应用．本文对催化精馏用于乳酸乙酯的生产进行了初步研究，有关催化精馏过程的研究文献报道很多，而利用催化精馏技术生产乳酸乙酯的研究尚未见文献报道，因此对它的研究无论在理论上还是在应用上都具有十分重要的意义．
A catalytic distillation process for the synthesis of ethyl lactate was proposed, starting from lactic acid and ethanol over ion-exchange resin catalyst. Experimental research work was carried out to investigate the effects of reflux ratio, ratio of ethanol to lactic acid, lactic acid feeding flux and feed location on ethyl lactate yield. In this experiment, the appropriate conditions were as follows： reflux ratio 1：1, molar ratio of ethanol to lactic acid 4 ：1, lactic acid feeding flux 0. 6284 mol ·h^-1, feed location point A feed lactic acid and point H feed ethanol, and the yield of ethyl lactate reached 31.64%. The catalytic distillation tower was simulated with ASPEN PLUS. The experiment results agreed well with simulation. The results show that the proposed method is promising for further study.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第11期2638-2641,共4页
CIESC Journal
基金
国家自然科学基金重大项目(20036010)
河北省教育厅自然科学研究计划项目(2002150).~~
关键词
乳酸乙酯
催化精馏
酯化反应
离子交换树脂
ethyl lactate
catalytic distillation
esterification
ion exchange resin
