When non-noble metal catalysts are selected for selective hydrogenation of diolefin, full-range FCC gasoline hydrogenation process is preferred.
当选用非贵金属催化剂时，二烯烃选择性加氢单元应优先采用催化裂化全馏分加氢流程；
2
After the 2~(nd) revamp of Ethylene Plant, the diversified feedstock changed the quality of cracking feedstock, thus inerea- sing the diolefin content in cracking C_5 product.