汽油铜片腐蚀不合格的原因分析及对策

针对中国石化济南分公司催化裂化精制汽油铜片腐蚀经常不合格，并导致成品调合罐样品常常出现铜片腐蚀不合格的情况，对原因进行分析并提出应对措施。结果表明，成品汽油铜片腐蚀不合格的原因是第一套催化裂化装置（简称一催化）的精制汽油中含有多硫化物等活性硫化物，单质硫和多硫化物经过氢氧化钠乙醇溶液洗涤后可以被除去，使汽油铜片腐蚀情况改善。一催化精制汽油中的活性硫化物可能来自直馏汽油中的单质硫。通过更改工艺，将含有单质硫的一催化稳定汽油全部改进S Zorb装置，剩余的二催化稳定汽油进入脱硫脱臭单元，彻底解决了成品汽油铜片腐蚀不合格的问题

ANALYSIS OF OFF-SPECIFICATION OF GASOLINE COPPER CORROSION AND COUNTERMEASURES

The copper corrosion test of refined FCC gasoline and gasoline product in pool is often not qualified in SINOPEC Jinan Company. The cause of off-specification of gasoline copper corrosion was analyzed and countermeasures were put forward. It is found that the element sulfur in refined FCC gasoline from straight run gasoline（SRG） is the main reason for that phenomenon. The problem of off-specification of gasoline copper corrosion has now been solved completely by means of changing process scheme where the SRG containing elemental sulfur，the stabilized gasoline from the No.1 catalytic cracking unit and part of the stabilized gasoline from the No.2 catalytic cracking unit are processed in S Zorb unit and the remaining stabilized gasoline from the No.2 catalytic cracking unit is sent to gasoline desulfurization and deodorization unit.