催化裂化汽油流化床非临氢改质工艺研究

RESEARCH ON NON-HYDROGENATION FLUIDIZED-BED FCC NAPHTHA UPGRADING PROCESS

介绍了一种使用ZSM-5沸石催化剂对催化裂化汽油进行改质的流化床反应工艺。此工艺可有效降低汽油烯烃和硫含量,同时提高汽油辛烷值,改质汽油收率高,干气和焦炭产率较低。研究了不同反应条件下以及不同馏分汽油改质后产物分布的变化和烯烃、硫含量等汽油性质的改善情况。研究结果表明,采用低反应温度、高催化剂循环量条件,改质汽油烯烃含量、硫含量降低幅度大;相反,则裂化气产率和丙烯选择性提高。加工重馏分汽油时改质汽油收率高,但较全馏分汽油改质烯烃含量降幅稍低。

A fluidized-bed process for upgrading FCC naphtha ZSM-5 zeolite catalyst has been developed. The process is effective in reducing olefin and sulfur in gasoline, enhancing octane number, increasing yield of upgraded products and lowering gas and coke make. The study on the improvements of product distributions and reduction of olefins and sulfur at different reaction conditions shows that the lower reaction temperature and higher catalyst recycle rate favor the reduction of olefin and sulfur in upgraded naphtha. Otherwise, the cracked gas yield and propylene selectivity will go up. The upgraded gasoline yield is high for heavy naphtha fraction upgrading and olefin is low for full-range naphtha upgrading.