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ID:37338408
大小:9.59 MB
页数:113页
时间:2019-05-22
《改性酚酞侧基聚芳醚酮渗透蒸发膜的制备及其醋酸脱水性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、厦门大学博士学位论文改性酚酞侧基聚芳醚酮渗透蒸发膜的制备及其醋酸脱水性能研究姓名:陈建华申请学位级别:博士专业:工业催化指导教师:刘庆林20080601摘要大,在STA的含量为12wt%时达到极大值,然后,随着STA的含量的增大而减少。当STA的含量为12wt%时,膜的分离指数达到了极大值。当进料水浓度为10wt%和迸料温度为50。C,通量和分离因子分别为597gm。2h01和70.3。利用PEK-C制备复合膜的支撑层,以戊二醛交联的SPEK.C和STA/PVA.SPEK-C为活性层,制备各种复合膜。研究均质膜与复合膜的渗
2、透蒸发性能之间的差异,结果表明,与均质膜相比,复合膜的性能有了很大的提高。扫描电镜测试表明,利用共溶剂可提高STA.PVA.SPEK.C.GA/PEK.C活性层与支撑层相容性;界面形态对膜的渗透蒸发性能有很大的影响,采用水和二甲亚砜为共溶剂的膜的性能高于单一以二甲亚砜为溶剂的膜的性能。当进料水浓度为10wt%和进料温度为50。C,采用共溶剂的STA.PVA.SPEK.C.GA/PEK.C的膜的通量和分离因子分别为592gm’2h.1和91.2。关键词:酚酞侧基聚芳醚酮;聚乙烯醇:硅钨酸;醋酸AbstractAceticac
3、idisoneofthemostdemandproductsinthechemicalindustry.Althoughaceticacidandwatermixtureisnotanazeotropiccompound,therelativevolatilityofwatertoaceticacidisclosetounity.Itbecomesevenmoredifficulttoseparatebydistillation雒thecompositionsofwaterinliquidandvaporphaseappr
4、oachalmostequal,especiallyintheregionoftheaceticacidcontentbeinghigherthan80wt%.Aconventionaldehydrationofaceticacidiscompletedbydistillationanenergy-consumptionskill.Sotheseparationofaceticacidfromwaterisaneye-catchertask.Asanovelseparationtechnology,pervaporatio
5、n(PV)isveryeconomicaltoremovethecomponentfromthemixtureswhenitscontentislowerthan20、Ⅳt%.Themostusedhydrophilicmembranes,suchasPoly(vinylalcoh01)(PVA),Polyacrylicacid(PAA),Ployacrylonitrile(PAN)andsodiumalginate(NaAlg),showdiscouragingseparationcapabilityinPVofacet
6、icacidaqueousforitsstrongacidity.Fromthedehydrationofaceticacidinindustry,novelmembranesusedforthispurposewerepreparedbymodifyingCardopolyetherketone(PEK—C)(whichissolventresistanceandhydrophobic)forthefirsttime.ThemembraneswerecharacterizedbyX-raydiffraction(XgD)
7、,Fouriertransforminfrared(FTIR),Scanningelectronmicroscope(SEM),Transmissionelectronmicroscope(TEM),DifferentialScanningCalorimetry(DSC)andcontactanglemeter,andtheirswellingandsorptionproperties,diffusionproperties,andpervaporationpropertieswereinvestigatedsystema
8、tically.ThehydrophilicityofPEK-CCanbeeffectivelyendowedbyreactingitwithconcentratedsulfuricacid,andthehydrophilic-hydrophobicbalanceofthemembranescarlbe
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