镁铝水滑石制备复合金属氧化物及其催化处理废弃聚酯材料  

Preparation of Mixed Metal Oxides from Mg-Al hydrotalcite and Catalytic Treatment of Waste Polyester Material

作　　者：陈飞飞[1,2] 王光辉[1] 李伟[2] 杨锋[2] 

机构地区：[1]武汉科技大学化学工程与技术学院,湖北武汉430081 [2]武汉纺织大学化学与化工学院,湖北武汉430073

出　　处：《化工环保》2012年第3期277-281,共5页Environmental Protection of Chemical Industry

摘　　要：采用共沉淀法合成了镁铝水滑石并将其在不同温度下煅烧得到复合金属氧化物。将两者作为催化剂用于醇解聚对苯二甲酸乙二醇酯(PET)反应中。实验结果表明:复合金属氧化物的催化活性明显高于其前体,最佳煅烧温度为500℃;在催化剂与PET质量比为1.0%、醇解反应时间为50 min时,产物对苯二甲酸乙二醇酯(BHET)的产率可达到81%。镁铝水滑石煅烧后得到的复合金属氧化物是一种高效、环境友好型醇解PET催化剂,可以替代目前常用的均相催化剂。Mg-A1 hydrotalcite was prepared by coprecipitation method and then calcined at difference temperature to produce two mixed metal oxides. The two products were used as catalysts in alcoholysis of polyethylene terephthalate（PET）. The experimental results show that： The catalytic activities of the two mixed metal oxides are much higher than that of their precursors; The optimum calcination temperature is 500 % ; When the mass ratio of catalysts to PET is 1.0% and the alcoholysis time is 50 min, the yield of bis-hydroxyethyl terephthalate（BHET） can reach 81%. The mixed metal oxides obtained from Mg-A1 hydrotalcite is a kind of effective, eco-friendly catalysts for alcoholysis of PET, and they can replace common homogeneous catalysts.

关 键 词：镁铝水滑石 复合金属氧化物 聚对苯二甲酸乙二醇酯 聚酯 醇解 催化剂 固体废弃物 

分 类 号：X705[环境科学与工程—环境工程]