摘要
本研究采用三辛基氧化膦/环己烷对热解油馏分中的酚类物质进行了萃取,考察了三辛基氧化膦用量、环己烷用量、萃取温度、萃取时间等不同条件对酚类物质萃取效率的影响.结果表明最佳萃取条件为:三辛基氧化膦与热解油馏分中酚类的摩尔比为2.5、萃取相中三辛基氧化膦的质量分数为10%、萃取温度为23℃、萃取时间为10 min.在此条件下,可获得愈创木酚、2-甲氧基-4-甲基苯酚、苯酚、间甲酚和4-乙基苯酚的萃取效率分别为 65%、75%、84%、83%和90%.上述结果说明基于三辛基氧化膦的反应萃取法对热解油馏分中的酚类物质有较好的分离效果.
Abstract
In this study,trioctyl phosphine oxide(TOPO)/cyclohexane was used to extract the phenols from a pyrolysis oil distillate boiling at 140～250℃through atmospheric distillation.In order to optimize the separation of phenols,the effects of TOPO dosage,cyclohexane dosage,extraction temperature and extraction time on the extraction equilibrium were investigated.The results showed that the optimized extraction conditions were the molar ratio of TOPO to phenols 2.5,the mass fractions of TOPO in extract phase 10%,extraction temperature 23℃,extraction time 10 min.Under the conditions,the extraction efficiencies of guaiacol,2-methoxy-4-methyl phenol,phenol,m-cresol and 4-ethyl phenol were 65%,75%,84%,83%and 90%,respectively.This indicated that the reaction extraction method based on TOPO had a good separation effect on phenols in pyrolysis oil fractions.
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