降低催化裂解汽油苯含量的研究及工业实践

中海油东方石化有限责任公司催化裂解汽油苯含量较高，受加工流程限制，通过调整装置操作参数以降低汽油苯含量。简述了催化裂解汽油中苯的生成机理，汽油中的苯主要来自芳烃的侧链裂解反应、环烷烃的氢转移反应和烯烃的环化脱氢反应；分析了催化裂解装置原料性质、操作条件及催化剂性质对汽油苯含量的影响，通过操作参数的调整，使催化裂解汽油苯体积分数由1.60%降至1.40%。将降低汽油苯含量的的理论成功应用于生产实践，取得良好的应用效果。

STUDY AND INDUSTRIAL PRACTICE ON REDUCING BENZENE CONTENT OF DCC NAPHTHA

The benzene content of naphtha from DCC unit of Dongfang Petrochemical Corporation Ltd. was high. Being limited by the process flow, in order to reduce benzene content of naphtha, the operation of DCC unit was adjusted baseing on the understanding of mechanism of benzene formation. It is recognized that benzene comes from cracking reaction of side chains in aromatic hydrocarbon , hydrogen transfer reaction of cycloalkane and dehydrocyclization reaction of alkenes. The effects of raw material properties, operation conditions and properties of catalyst on benzene content in naphtha were analyzed. By adjusting the operation conditions，benzene content of naphtha was reduced from 1.60% to 1.40%.