β/AlMCM41分子筛的合成及催化酯化反应的性能

PDF全文下载： 2016020130

王志萍， 于世涛*

（青岛科技大学 化工学院，山东 青岛 266042）

 摘要： 采用分步晶化法合成出分子筛β/AlMCM41，考察了硅铝比、水硅比（均为物质的量的比)、pH值、晶化温度、晶化时间、焙烧温度、焙烧时间等合成条件对分子筛结构与性能的影响，对比分子筛结构与油酸转化率，得到催化酯化反应的分子筛的较佳合成条件：硅铝比30∶1，水硅比150∶1，pH值85，晶化温度110 ℃、晶化时间24 h，焙烧温度550 ℃，焙烧时间8 h。将该条件下得到的分子筛用于催化油酸与甲醇的酯化反应，考察了醇油比、反应温度、反应时间、催化剂用量等工艺条件对油酸转化率的影响，得到了较佳的反应条件：醇油比10∶1，催化剂用量为反应物质量的5%，反应温度120 ℃，反应时间8 h，此时油酸的转化率能达到7477%，催化活性较高。

关键词： β/AlMCM41； 分子筛； 生物柴油； 酯化反应

 中图分类号： TQ 426.61          文献标志码： A

 Synthesis and Catalytic Performance of β/AlMCM41 for Esterification Reaction

 WANG Zhiping, YU Shitao

 (CollegeofChemical Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China)

 Abstract: β/AlMCM41 was synthesized by the method of the stepwise crystallization. The effects of synthesis conditions on the structure and performance of β/AlMCM41 such as n(Si)∶n(Al), n(H2O)∶n(Si), pH value, crystallization temperature and time, calcinations temperature and time were examined.  By comparing the structure of molecular sieve and conversion of oleic acid, the optimum synthesis conditions were:n(Si)∶n(Al)=30∶1, n(H2O)∶n(Si)=150∶1, pH=85, crystallization temperature 110 ℃, crystallization time 24 h, calcination temperature 550 ℃, calcination time 8 h. The synthesized β/AlMCM41 was used to catalyze the synthesis of methyl oleate, the effect of reaction conditions on the conversion of oleic acid such as molar ratio of methanol to oleic acid, reaction temperature and time, amounts of catalysts were examined. The optimum reaction conditions were: Molar ratio of methanol to oleic acid 10∶1, reaction temperature 120 ℃, reaction time 8 h, amounts of catalyst 5%. The results indicated that the synthesized β/AlMCM41 has better catalytic activity and the conversion of oleic acid was 7477% under above optimum conditions.

Key words: β/AlMCM41; molecular sieve; biodiesel; esterification

 收稿日期： 20150617

作者简介： 王志萍（1979—），女，讲师. *通信联系人.

文章编号： 16726987（2016）02013007； DOI： 10.16351/j.16726987.2016.02.003