关键词: 干气制乙苯装置, 烷基化催化剂, 快速失活, 碱性物质, 氮化物, 反应器床层温升, 干气水洗

Abstract:

This article introduces the rapid deactivation of the alkylation catalyst for ethylbenzene production from dry gas in SINOPEC Anqing Petrochemical Company. The reasons for the rapid deactivation of alkylation catalyst are discussed, and the sources of alkaline substances in feedstock dry gas or benzene and the differences that affect the catalyst are analyzed. It is proposed that impurities other than alkaline substances can also affect catalyst activity. Through experimental analysis, it is found that in addition to ammonia gas, the dry gas of the catalytic unit also contains unknown nitrides. Through industrial experiments, it was verified that exhaust gas from outside the catalytic unit can significantly affect the activity of alkylation catalyst. After removing the complex exhaust gas and dry gas from the system, the catalyst activity can remain stable for a long time. During production, water washing system renovation was carried out, complex exhaust gas was cut out, and connection between upstream and downstream unit was strengthened. The actual service life of alkylation catalysts significantly exceeded their normal service life.

Key words: dry gas to ethylbenzene unit, alkylation catalyst, rapid deactivation, alkaline substances, nitrides, temperature rise of reactor bed layer, dry gas water washing