HZSM-5分子筛催化合成癸二酸二丁氧基乙酯

Synthesis of bis(2-butoxyethyl) sebacate catalyzed by HZSM-5

以癸二酸和乙二醇单丁醚为原料,用HZSM-5分子筛催化合成环保耐寒性增塑剂癸二酸二丁氧基乙酯。考察了催化剂的硅铝比、催化剂用量、带水剂用量、原料配比、反应时间对酯化率的影响。最佳工艺条件为:醇酸摩尔比为2.5∶1,催化剂用量为酸质量的5%,带水剂用量为酸质量的15%,反应时间为3.5 h,反应温度为170～200℃,该工艺条件下酯化率可达91.91%。经过5次使用后,酯化率仍在90%以上。同时建立了该酯化合成的表观动力学模型,得到反应速率方程为:r=-dCA/dt=2.821 ×1012 e118189/RT CA3 mol2/(L2·min)。

The environment-friendly frost resisting plasticizer（bis（2-butoxyethyl） sebacate） was synthesized by reaction of sebacic acid（SA） with 2-butoxyethanol（EB） using HZSM-5 as catalyst.The effects of Si/Al ratio,dosage of catalyst,dosage of water-entrainer,raw materials ratio and reaction time on the yield were investigated.The optimal reaction conditions were as follows：n（EB）∶ n（SA）=2.5∶1,catalyst（5% of mass of SA）,water-entrainer（15% of mass of SA）,reaction time（3.5 h） and reaction temperature（170～200℃）,the esterification rate was 91.91%.After five times of repeated use,the esterification yield still maintained above 90% over HZSM-5.The apparent kinetics model of esterification was established,and the equation of reaction rate was ： r=-dCA/dt=2.821 ×1012 e118189/RT CA3 mol2/（L2·min）。