加氢汽油产品中C5组分超标问题分析及对策

Analysis and Countermeasure for Excessive C5 in Hydrogenation Gasoline

裂解汽油加氢装置工艺流程改变为前脱C5、C9流程后,加氢汽油产品中C5组分超标,其主要原因是在脱辛烷塔内出现C5组分的增量。经过分析和计算查找出脱辛烷塔在负压操作下,较高的塔釜操作温度提供了双环戊二烯等不饱和烃分解为戊二烯的转化环境和必要条件,通过实施避免稳定塔内C5组分积累的技术改造,解决了加氢汽油产品中C5组分超标的问题,改造后效果良好,完善了前脱C5、C9后加氢工艺流程的不足。

After the technological process of pyrolysis gasoline hydrogenation unit was changed to the front-end removal C5/C9 operation,the C5 component exceeded the standard in the hydrogenation gasoline product.The main reason was the increment of C5 component in the de-octane tower.Through reasonable analysis and calculation,it was found that,in the de-octane tower under the negative pressure operation,higher tower operating temperature provided the necessary conditions for the decomposition of unsaturated hydrocarbons such as dicyclopentadiene into pentadiene.The technical modification to avoid accumulation of C5 component in the stabilizing tower has solved the problem of excessive C5 in hydrogenated gasoline products.After the modification,the implementation effect was good,and remedied the shortcomings of the removal C5/C9 process before hydrogenation.