加氢汽油博士试验不通过的原因及解决方案

摘要

催化裂化汽油加氢后,在硫质量分数降低到10 μg/g以下的同时,其硫醇硫质量分数甚至降低到5 μg/g以下,但仍会引起博士试验经常不通过的问题.以某炼油厂的日常博士试验检测数据为依据,分析了加氢汽油博士试验不通过的原因,并提出相应的解决方案.加氢汽油博士试验不通过的主要原因在于催化裂化汽油加氢后新生成了微量的大分子硫醇.解决方案为:在执行满足国Ⅴ、国Ⅵ排放标准要求的汽油时取消对汽油产品的博士试验检测;加大无硫汽油组分与加氢汽油组分的调合比例;对加氢汽油进行氧化脱臭等.%The doctor test often does not pass for hydrotreated FCC naphtha with 10 μg/g sulfur,even lower than 5 μg/g mercaptan content.Based on the data of routine doctor test,the reason was analyzed and corresponding solutions were suggested.It is found that the main reason for the failure is the newly formed trace amount of mercaptan with larger molecular weight during FCC naphtha hydrotreating.Those compounds have no influence on the properties of the gasoline.Solutions are:cancelling doctor test for hydrotreated FCC naphtha when national Ⅴ/Ⅵ standard gasoline are the operation objective;increasing the blending ratio of zero-sulfur gasoline component/hydrotreated FCC naphtha;and oxidative sweetening the hydrotreatd naphtha.