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

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.