溶剂萃取-亲核反应脱除塑料热解油中有机氯  

Removal of organochlorine from plastic pyrolysis oil by solvent extraction coupled with nucleophilic reaction

作　　者：张清翔 裴亚宁 张登前 张伟 张晨 李翠清[1] ZHANG Qingxiang;PEI Yaning;ZHANG Dengqian;ZHANG Wei;ZHANG Chen;LI Cuiqing(Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Sinopec Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China)

机构地区：[1]北京石油化工学院新材料与化工学院燃料清洁化及高效催化减排技术北京市重点实验室,北京102617 [2]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油化工》2024年第4期511-517,共7页Petrochemical Technology

基　　金：国家能源石油炼制技术研发中心(中石化石油化工科学研究院有限公司)开放基金课题(202201)。

摘　　要：研究了溶剂萃取-亲核反应脱氯,考察了反应溶剂类型、亲核试剂类型和用量、反应溶剂与油品质量比、油品中其他组分等因素对亲核反应脱氯效果的影响,分析了溶剂萃取-亲核反应脱氯的速控步骤,鉴定了不同氯化物的反应产物。实验结果表明,三乙二醇、二乙二醇、乙二醇、甘油均可有效萃取有机氯,对亲核试剂有较高的溶解性,可促进有机氯和亲核试剂的接触和反应,且黏度低的反应溶剂更有利于亲核反应脱氯,其中乙二醇的综合性能最好;有机氯的萃取是溶剂萃取-亲核反应脱氯的速控步骤;在研究的各种亲核试剂中,NaHS的亲核性最强,当反应温度为150℃、n(NaHS)∶n(Cl)=4、m(乙二醇)∶m(油品)=1时,真实塑料热解油脱氯率达到95.8%;伯氯代烃和仲氯代烃的反应活性显著高于氯代芳烃。Solvent extraction-nucleophilic dechlorination was investigated.The effects of reaction solvent type,nucleophilic reagent type and amount,mass ratio of reaction solvent to oil,and other components of the oil on dechlorination by nucleophilic reaction were examined,the rapid-control steps of solvent extraction-nucleophilic dechlorination were analyzed,and the reaction products of different chlorinated compounds were identified.The experimental results show that triethylene glycol,diethylene glycol,ethylene glycol and glycerol can effectively extract organochlorine and have high solubility for nucleophilic reagents,which can promote the contact and reaction between organochlorine and nucleophilic reagents,and reaction solvents with low viscosity are more conducive to nucleophilic dechlorination,among which ethylene glycol has the best overall performance.Extraction of organochlorine is a quick-control step of solvent extraction-nucleophilic dechlorination.Among the nucleophilic reagents studied,NaHS has the best nucleophilic properties.Among the nucleophilic reagents studied,NaHS has the strongest nucleophilicity,and the dechlorination rate of real plastic pyrolysis oil reaches 95.8%when the reaction temperature is 150℃,n(NaHS)∶n(Cl)=4,and m(ethylene glycol)∶m(oil)=1.The reactivity of primary chlorinated hydrocarbon and secondary chlorinated hydrocarbon is significantly higher than that of chlorinated aromatic hydrocarbon.

关 键 词：脱氯 亲核反应 萃取 反应溶剂 塑料热解油 

分 类 号：TE626[石油与天然气工程—油气加工工程]