芳烃抽提蒸馏工艺溶剂环丁砜中重组分的脱除

针对加氢裂解汽油芳烃抽提蒸馏工艺中重组分在贫溶剂中的积累问题，分别考察抽余油反萃取、水洗贫溶剂、水洗富溶剂、抽余油反萃取-水洗耦合4种方法对环丁砜溶剂的净化再生效果。结果表明，重组分中直链烷基苯最容易被脱除，多环芳烃的分离难度最大；温度对重组分的脱除有一定影响，且采用不同方法时的影响程度不同；4种方法中抽余油反萃取-水洗耦合法的再生效果最优，能够在油剂比（抽余油与待再生贫溶剂的质量比）为1.0、水洗比（水洗水与待再生贫溶剂的质量比）为1.0、温度为40℃的条件下，将贫溶剂中的环丁砜质量分数从94.25%提升至99.86%，达到工业生产所需循环贫溶剂的纯度要求。

REMOVAL OF HEAVY COMPONENTS FROM SULFOLANE IN BTX EXTRACT-DISTILLATION PROCESS

The accumulation of heavy components in lean solvent occurs in the extraction-distillation process of pyrolysis gasoline after hydrogenation. The purification effect of sulfolane solvent were investigated by four methods: back-extraction of reffinate, water washing of lean solvent, water washing of rich solvent, and combination of back-extraction of raffinate and water washing. The results showed that among all the heavy components，the linear alkylbenzenes were the easiest to remove，while the separation of polycyclic aromatics were the most difficult；temperature had a certain influence on the removal of the heavy components，and the effect was different in different methods. The purification results of back-extraction and water washing coupling methods for raffinate were the best. The mass fraction of sulfolane in the lean solvent can increase from 94.25% to 99.86% under the following conditions：the ratio of raffinate to lean solvent of 1.0，the washing water to the solvent ratio of 1.0，the temperature of 40℃. The purified solvent meets the purity requirement of recycled lean solvent for industrial production.