催化剂焙烧温度和进料组成对乳酸甲酯脱水反应的影响  

Influence of catalyst calcination temperature and feed composition on dehydration of methyl lactate over silica-supported mono-sodium phosphate

作　　者：张志强[1] 屈一新[1] 王水[1] 王际东[1] 

机构地区：[1]北京化工大学化学工程学院北京市生物加工过程重点实验室,北京100029

出　　处：《工业催化》2009年第9期12-16,共5页Industrial Catalysis

基　　金：国家重点基础研究发展计划基金项目(973计划)(2007CB714304)

摘　　要：以可再生的生物原料乳酸的衍生物乳酸甲酯为反应物,在硅胶负载的NaH_2P_O4催化剂(1.0 mmol·g^(_1)的NaH_2PO_4/SiO_2)上脱水生成丙烯酸和丙烯酸甲酯,考察催化剂焙烧温度和进料组成对乳酸甲酯脱水反应的影响。结果表明,催化剂适宜焙烧温度为450℃,乳酸甲酯进料中添加甲醇,能促进丙烯酸甲酯的生成,提高总脱水产物选择性,而添加水会促进乙醛的生成,对脱水反应不利。Dehydration of biomass-derived methyl lactate to methyl acrylate and acrylic acid over silica supported NaH_2PO_4 was investigated in a fixed-bed continuous flow reactor.The catalyst was prepared by impregnation method followed by calcination at different temperature ranging from 400 ℃ to 650 ℃ for 6 h in a static air atmosphere,with optimum calcination temperature of 450 ℃.Changes in structure of the catalysts resulted from different calcination temperature were characterized by XRD and N_2 adsorption. The influence of addition of methanol or water in the feed was also investigated.It was found that addition of methanol favored formation of methyl acrylate and enhanced total selectivity to acrylate,while addition of water significantly increased the formation of acetaldehyde and lowered total selectivity to acrylate.

关 键 词：催化化学 乳酸甲酯脱水 丙烯酸甲酯 丙烯酸 磷酸二氢钠催化剂 焙烧温度 进料组成 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]