负载型膨润土固体碱催化剂的制备及在生物柴油合成中的应用  

Preparation of solid base catalyst supported on bentonite and its application in synthesis of biodiesel

作　　者：樊欣梅[1] 张德虎[1] 黄彪[1] 王华杰[1] 韦藤幼[1,2] 童张法[1,2] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西生物产业新技术重点实验室,广西南宁530004

出　　处：《化工进展》2009年第11期1951-1954,共4页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(20766001);全国大学生创新实验基金(广西大学200713)

摘　　要：提出了一种负载型膨润土固体碱催化剂的制备方法,并将此催化剂用于生物柴油合成的酯交换反应。该催化剂通过碱性钙基膨润土在半干条件下负载氢氧化钠制得。催化剂制备的单因素实验结果表明:当氢氧化钠与碱性钙基膨润土的质量配比为0.6、负载时间为18h、温度为60℃及碱性钙基膨润土中OH-含量为1.5mmol/g时,催化剂中氢氧化钠负载量达到4.10mmol/g。将该催化剂用于生物柴油酯交换反应,反应转化率可达97.4%,反应完成后生物柴油无需洗涤,避免了三废的大量排放,减少了对环境的污染。A solid base catalyst supported on bentonite was introduced and used in the transesterification process for biodiesel production. The catalyst was prepared by adsorbing sodium hydroxide into the layers of semi-dried alkaline Ca-bentonite. The results of single factor experiments for catalyst preparation showed that the optimum conditions are： the mass ratio of NaOH and alkaline Ca-bentonite is 0.6, the loading time is 18 h, the temperature is 60℃, and the OH- contained in alkaline Ca-bentonite is 1.5 mmol·g^-1, respectively, with which the loading amount of NaOH is 4.10 mmol.g^-1. The transesterification conversion to biodiesel can be reached to 97.4% with the prepared catalyst, and the obtained biodiesel is no need to wash, which can avoid the release of a large amount of waste water and protect environment from being polluted.

关 键 词：氢氧化钠 膨润土 固体碱催化剂 酯交换 

分 类 号：TQ426[化学工程] TQ645