催化裂化汽油的下行床催化转化

以循环下行床为反应器,催化裂化汽油为原料,在工业催化裂化(FCC)催化剂和催化裂解(DCC)催化剂作用下,研究了催化裂化汽油的催化转化过程。实验结果表明,在下行床反应器中,催化裂化汽油中的烯烃能显著降低,主要转化为低碳烯烃产品,同时得到富含芳烃的液体产品,副产干气和焦炭量很低。催化裂化汽油在FCC催化剂和DCC催化剂上表现出不同的反应机理。FCC催化剂孔道大,可以发生双分子裂化反应和单分子裂化反应,而DCC催化剂孔道小,以单分子裂化反应机理为主,同时DCC催化剂低碳烯烃选择性更高。

Catalytic Conversion of FCC Gasoline in A Dower Reactor

To reduce the olefin content of FCC gasoline, a circulating downer reactor was built to study the cracking behavior of straight - run FCC gasoline using commercial FCC and DCC equivalent catalyst. In the downer reactor olefins in gasoline could be converted to light olefins(LPG-range) and liquid products containing less olefins but much more aromatics. The amount of dry gas and coke of the process was low. The cracking mechanism of the gasoline were investigated. Gasoline exhibited different cracking mechanism on FCC and DCC catalyst. In larger pores of FCC base catalyst monomolecular cracking and bimolecular cracking reactions both took place but in smaller pores of DCC catalyst only monomolecular cracking took place. The shape selective mechanism accounts for the higher selectivity of light olefins on DCC catalyst than on FCC catalyst.