分子筛催化剂上催化裂化汽油掺混甲醇的改质研究

以实现甲醇制取低碳烯烃转化工艺和FCC汽油降烯烃工艺的有效组合为目的,在固定床微型反应装置上,使用SAPO-34、ZSM-5、DOCO以及分子筛组合催化剂,对FCC汽油掺混甲醇改质进行了研究。主要对反应温度、空速和混炼比等影响因素进行了考察。结果表明,SAPO-34分子筛上甲醇制取低碳烯烃效果较好,高烯烃含量汽油在SAPO-34分子筛上的氢转移和芳构化效果显著,ZSM-5分子筛上的芳构化反应效果和DOCO的异构化反应效果较显著,甲醇转化与汽油转化反应间的相互协同作用,既有利于甲醇转化成低碳烯烃又能提高汽油降烯烃转化深度。适宜的混炼条件:反应温度400℃,m(甲醇):m(汽油)=0.05,空速3h~(-1),组合催化剂上,产物汽油中烯烃含量较FCC粗汽油下降23%以上。

Upgrading of FCC gasoline blended with methanol over zeolite combined catalysts

In the fixed bed microreactor, for the purpose of combination of methanol conversion process MTO and fluid catalytic cracking （FCC） gasoline modification progress, the modification progress for upgrading of FCC gasoline mixed with methanol over SAPO-34 ,ZSM-5, DOCO, MCM-41 and zeolite com- bined catalysts and influencial factors of reaction temperature, space velocity, methanol/gasoline mass ratio were investigated. The results showed that SAPO-34 zeolite showed better catalytic behaviors for MTO and remarkable effects of hydrogen transfer and aromatization of gasoline with high-olefin content; the properties of aromatization over ZSM-5 zeolite and isomerization over DOCO catalyst were superior; reaction synergy between methanol conversion and gasoline conversion was beneficial to methanol to light olefins and increase of gasoline conversion;compared with FCC nathpha, olefin content in FCC gasoline over the combined catalyst reduced over 23% under optimum condition as follows：reaction temperature 400 ℃, m（ methanol）： m（gasoline） =0.05, space velocity 3 h-1.