SAPO-34分子筛催化剂制备及发展现状

乙烯和丙烯作为重要的化工原料,在经济发展中的需求量越来越大。在石油资源越来越匮乏的今天,甲醇制烯烃作为一种可以代替常规石油路线生产低碳烯烃的新工艺受到广泛关注。SAPO-34分子筛因为高甲醇转化率和优良烯烃选择性成为当前甲醇制烯烃工艺催化剂的研究重点。合成SAPO-34分子筛的影响因素有模板剂、合成原料和反应条件等。通过调节分子筛粒径尺寸、酸性、金属改性可以实现分子筛的性能优化。介绍了SAPO-34分子筛催化剂常用的制备方法和一些分子筛催化剂改进的专利。使用一定时间后催化剂由于积炭而失活,再生工艺目前主要采用烧焦再生。2011年,神华煤制烯烃示范工程进入工业化运行,近年陆续有多套甲醇制烯烃装置投产和在建,煤制烯烃正在改变中国聚烯烃市场格局。

Preparation and development status of SAPO-34 molecular sieve catalysts for methanol to olefins

Ethylene and propylene are important chemical materials.The demand for them grows very fast in the economic developments.The technologies of Methanol-to-Olefins(MTO) as a new production technology of low carbon olefins instead of conventional oil routes was gained widely attention.SAPO-34 molecular sieves were studied intensively because of its high methanol conversion and good selectivity to olefins.The influence factors of SAPO-34 molecular sieves synthesis such as the templates,raw materials and reaction conditions were discussed.The performance of molecular sieves was optimized by adjusting the particle size of molecular sieves,acidity and metal modification.Additionally,the normal preparation methods of SAPO-34 molecular catalysts for MTO and some patents about their performance optimization were introduced.The regeneration process of the deactivation catalysts for carbon deposit was mainly calcination.In 2011,MTO project of Shenhua Group was industrialized.In recent years,many MTO projects went into operation and are under construction nowadays.MTO brings changes to the market of polyolefin.