阳离子交换树脂催化合成富马酸二丁酯

Synthesis of dibutyl fumarate on cation exchange resin

以阳离子交换树脂(NKC-9)为催化剂、富马酸单甲酯和正丁醇为原料合成富马酸二丁酯,考察了原料配比、催化剂用量、反应时间和甲苯用量等因素对反应的影响以及催化剂的重复使用性能。最佳反应工艺条件为:n(正丁醇)∶n(富马酸单甲酯)=3.0∶1、w(NKC-9)=6.0%、反应温度不高于120℃、w(甲苯)=49.5%、反应时间2.5 h。结果表明,在该条件下富马酸单甲酯的转化率为98.1%;催化剂经重复使用6次后,富马酸单甲酯的转化率为96.9%。阳离子交换树脂(NKC-9)具有催化活性高、稳定性好、无环境污染等优点。

Synthesis of dibutyl fumarate from monomethyl fumarate and n-butyl alcohol on cation exchange resin catalyst（NKC-9） was studied.Effects of reaction conditions,such as mole ratio of n-butyl alcohol to monomethyl fumarate,catalyst content,toluene content,and reaction time,and the reusability of the catalyst were investigated.Optimum reaction conditions were obtained,which were：n（n-butyl alcohol）∶n（monomethyl fumarate）=3.0∶1,catalyst content 6.0%（relative to total mass of monomethyl fumarate and n-butyl alcohol）,reaction temperature≤120 ℃,toluene content 49.5%（relative to total mass of monomethyl fumarate and n-butyl alcohol）,reaction time 2.5 h.The results showed that conversion of monomethyl fumarate could reach 98.1%,and activity of catalyst was still kept at 96.9% after being used 6 times.NKC-9 has many advantages,such as high activity,good stability and pollution-free to the environment.