耐寒增塑剂癸二酸二正己酯合成新工艺

Study on Synthesis of the Cold-resistant Plasticizer Dihexyl Sebacate

以癸二酸、正己醇为原料 ,直接酯化合成癸二酸二正己酯;分别研究了反应温度、反应时间、原料配比、催化剂用量等条件对合成反应的影响 ,确定了最佳工艺条件。该方法合成癸二酸二正己酯的最佳工艺条件是 :反应温度215℃ ,反应时间1.25h ,正己醇与癸二酸的摩尔比为3.25 ,催化剂用量为占体系总量的0.75 % ,癸二酸二正己酯的收率达到98.21 %。催化剂不经处理可循环使用多次。该催化剂具有价廉易得、催化活性好、不腐蚀设备、无环境污染等优点。

The dihexyl sebacat was synthesized from n-hexanol and decanedioic acid by direct esterification.The effect of reaction temperature,reaction time,materials ratio,the content of catalyst on the synthesis were studied,and the proper technological conditions were given as follows:the reaction temperature is215℃,reaction time is1.25h,the mo1ar ratio of n-hexanol to decanedioic acid is3.25,the content of catalyst is0.75%by weight of the total system mass.The yield of the product is98.21%.The catalyst could be used for many times without any treatments.Experimental results shows that the catalyst had many advantages such as easy preparation,lowcost and high activity.It was a1so non-corrosive and pollution-free to the environment.