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《磷酸三丁酯/煤油支撑液膜体系中苯酚的传质分离.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第37卷第9期化学工程Vol
2、37No.92009年9月CHEMICALENGINEERING(CHINA)Sep.2009磷酸三丁酯/煤油支撑液膜体系中苯酚的传质分离杨金杯,郑辉东一,王碧玉,吴燕翔(1.福州大学化学化工学院,福建福州350108:2.浙江大学二次资源化工国家专业实验室,浙江杭州310027)摘要:研究了苯酚在以多孔聚丙烯平板膜(Celgard2500)为支撑体、磷酸三丁酯(TBP)为膜载体和煤油为膜溶剂的支撑液膜体系中的传质过程;用传统萃取法测定了TBP/煤油体系中苯酚络合物摩尔比为1:1,同时得到25.0℃萃取平衡常数为96.72;考察了原
3、料相pH值、初始质量浓度、膜二侧转速、载体浓度和反萃取相碱浓度对苯酚传质的影响,确定了该体系分离苯酚的最佳条件:原料相pH<9,苯酚初始质量浓度<1000mg/L,膜二侧转速>300r/min,载体浓度为0.55mol/L,反萃取相碱浓度0.10mol/L;根据双膜理论提出苯酚的传质动力学方程,采用直线斜率法计算了苯酚在TBP/煤油支撑液膜体系中的扩散层厚度和膜内扩散系数,计算结果表明动力学方程计算值能较好地与实验值吻合,平均相对误差在2%以内。关键词:支撑液膜;苯酚;传质分离;TBP中图分类号:X703文献标识码:A文章编号:1005-9954(2009)09
4、-0032-05Masstransferandseparationofphenolintributylphosphate/kerosenesupportedliquidmembranesystemYANGJin-bei,ZHENGHui-dong,WANGBi-yu,WUYan-xiang(1.CollegeofChemistryandChemicalEngineering,FuzhouUniversity,Fuzhou350108,FujianProvince,China;2.NationalLaboratoryofSecondaryResourcesChem
5、icalEngineering,ZhejiangUniversity,Hangzhou310027,ZhejiangProvince,China)Abstract:Themasstransferofphenolfromfeedphaseintostrippingphasethroughsupportedliquidmembrane(SLM)wasstudiedbyusingCelgard2500porouspolypropylenefiat-sheetmembranesassupportsandtributylphosphate(TBP)dissolvedink
6、eroseneascarrier.ThecompositionmolefractionofphenolcomplexinTBP/kerosenesystemwas1:1throughthedeterminationoftraditionalextractionmethods,andthevalueofextractionequilibriumconstantswas96.72at25.0oC.TheeffectsofpHvalue,initialmasstheconcentrationinfeedphase,stirringspeedofthefeedandst
7、rippingphases,theconcentrationofTBPinthemembraneandthesodiumhydroxideconcentrationinthestrippingphaseonthemasstransferrateofphenolwerealsoinvestigated.TheoptimalconditionsofseparatingphenolthroughSLMareasfollows:thepHvalueoffeedphaseisbelow9,thephenolinitialmassconcentrationinfeedpha
8、seisbelow1000mg/L,thestirringspeedofthefeedandstrippingphasesismorethan300r/min,theconcentrationofTBPinthemembraneis0.55mol/L,andthesodiumhydroxideconcentrationinthestrippingphaseis0.10mol/L.Themasstransferkineticequationwasdeterminedintermsofdouble.filmtheory.Variousparameterssuchas
9、permeability
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