关键词: 乙苯装置, 催化剂, 快速失活, 催化裂化干气, 氨, 有机胺

Abstract: In recent years, the rapid deactivation of alkylation catalyst has occurred in some FCC dry gas to ethylbenzene units, which has affected the normal production of the unit and the economic benefits of the refinery. The FCC dry gas comes from the upstream FCCU and is sent to the ethylbenzene unit after desulfurization. It contains impurities such as ammonia, organic amine and organic oxide. The operation adjustment and fluctuation of the upstream unit will cause the change of impurity content. Alkylation catalyst is acid catalyst, ammonia and organic amine will make catalyst deactivation quickly. High concentration of ammonia in FCC dry gas is the main factor of catalyst fast deactivating after investigation. According to investigation, measures such as stable operation, purging liquid from gas, adjusting water scrubbing design are put forward to control the mass of ammonia not exceeding 5 μg/g to prevent catalyst from fast deactivating, and to make the alkylation catalyst activity meet the requirement of long-term stable operation of the unit.

Key words: ethylbenzene unit, catalyst, fast deactivating, FCC gas, ammonia, amine