阳离子聚丙烯酰胺絮凝回收利用SAPO-34分子筛母液

摘要

利用阳离子聚丙烯酰胺和稀盐酸组合絮凝的方法,将SAPO-34分子筛晶化母液中的磷铝物种经絮凝、干燥、粉碎后,添加一定量的硅铝等原料,在干胶转化体系下合成出具有片层堆积晶的多级结构SAPO-34分子筛.结果表明,制备的SAPO-34分子筛介孔孔容高达0.40 cm3/g,其在甲醇制烯烃(MTO)反应中催化寿命达到200 min,双烯(乙烯+丙烯)选择性达到87%.本研究提出的分子筛晶化母液处理工艺具有简单、经济、高效、绿色环保等特点.%Effective components from the crystallized mother liquor of zeolite catalysts were recovered by cationic polyacrylamide and dilute hydrochloric acid flocculation method,dried and ground into powder.After adding to the components a certain amount of silicon aluminum and other raw materials,hierarchical SAPO-34 molecular sieve with sheet stacking was synthesized by dry gel conversion method.The results show that mesoporous SAPO-34 molecular sieve gave a pore volume as high as 0.40 cm3/g,a catalytic life time of 200 min and a selectivity of light olefin (ethylene + propylene)of 87% for MTO reaction.The synthesis approach turns out to be sim-ple,economical and efficient.