摘要
[方法]利用中孔分子筛Al-MCM-41作催化剂,直接用反应物乙醇作带水剂,以乙醇和异戊烯酸为原料,采用分批补充乙醇的工艺方法合成农药异戊烯酸乙酯。考察了催化剂用量、反应物物质的量比、反应温度和反应时间对反应转化率和选择性的影响。[结果]该反应最佳的合成条件:异戊烯酸和乙醇的物质的量比为1∶8,催化剂的量为异戊烯酸质量的1.8%,反应时间为6 h,反应在剧烈回流温度下进行。在此条件下,异戊烯酸转化率可达89.9%,产品纯度大于99.7%。[结论]中孔分子筛Al-MCM-41可作为合成异戊烯酸乙酯高效而环保的固体酸催化剂。
[Methods] The isoprene ene acid ethyl ester was synthesized from isoprene ene acid and ethanol by using mesoporous molecular sieves AI-MCM-41 as catalyst and directly using reactant ethanol as dehydrant. The process methods of replenishing ethanol in batches was used. The factors such as catalyst amount, reactant ratio, reaction temperature and reaction time which affect the conversion and selectivity were investigated. [Results] The experimental result showed that the optimum conditions are as follows： the mole ratio of isoprene ene acid to ethanol is 1 ： 8; the amount of catalyst is 1.8% to isoprene ene acid; the reaction time is 6 h at reflux temperature. The conversion is 89.9% and the purity of the product is above 99.7% under the optimum conditions. [Conclusions] The mesoporous molecular sieves A1-MCM-41 can be used as efficient and environmental solid acid catalyst on the catalytic synthesis of isoprene ene acid ethyl ester.
出处
《农药》
CAS
北大核心
2012年第5期333-336,共4页
Agrochemicals
基金
河南省科技攻关重点项目(112102310424)
关键词
含铝中孔分子筛
异戊烯酸乙酯
异戊烯酸
乙醇
带水剂
aluminiferous mesoporous molecular sieves
isoprene ene acid ethyl ester
isoprene ene acid
ethanol
dehydrant
