摘要
采用自动快速蒸馏装置对脱砷前后的催化裂化汽油进行窄馏分切割,利用原子荧光光谱法对各窄馏分砷化物含量进行分析,研究催化汽油脱砷前后砷化物分布规律,为催化裂化汽油脱砷剂开发及脱砷工艺流程选择提供指导。实验结果表明:随着各窄馏分沸点增加,砷化物所占比例逐渐增大,90%以上砷化物均分布在80℃以上的重汽油组分中,尤其170℃以上馏分砷化物所占比例陡增,占总砷化物65.82%~96.31%。吸附脱砷剂对汽油150℃之前馏分中砷化物实现了全部脱除,而对150℃之后的重馏分脱砷率略有下降;临氢脱砷剂对汽油中80℃之前轻馏分和170℃之后重馏分中砷化物具有较高的脱除率,达到90%以上,而对中间馏分中砷化物脱除率较低。
The narrow fraction cutting of FCC gasoline before and after dearsenification were carried out in a flash distillation apparatus. The arsenide content in narrow fractions were analyzed by Atomic Fluorescence Spectrometry(AFS), and the arsenic distribution laws were studied, which provided guidance for the development of de-arsenic catalyst and the selection of arsenic removal process. The experimental results showed that the proportion of arsenide was increasing with the increase of the boiling point of narrow fraction, and more than 90% arsenide was in the heavy gasoline component(≥80℃). In particular,the proportion of arsenide in the fraction above 170℃ increased sharply, accounting for 65.82%-96.31%of the total arsenide. For adsorption dearsenification, the arsenic in the fraction of gasoline before 150℃was all removed, and the dearsening rate of heavy distillates above 150℃ decreased slightly. For hydrogenation dearsenification, the arsenic removal rates for the light fractions before 80℃ in gasoline and the heavy fractions after 170℃ were both higher than 90%, while that for the middle fraction was lower.
引文
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