江汉大学学报(自然科学版)
江漢大學學報(自然科學版)
강한대학학보(자연과학판)
JOURNAL OF JIANGHAN UNIVERSITY(NATURAL SCIENCES)
2014年
6期
27-34
,共8页
朱天容%李忠铭%刘继延%王亮%胡思前%唐开
硃天容%李忠銘%劉繼延%王亮%鬍思前%唐開
주천용%리충명%류계연%왕량%호사전%당개
渗透汽化%己内酰胺/水%再生纤维素膜%共混
滲透汽化%己內酰胺/水%再生纖維素膜%共混
삼투기화%기내선알/수%재생섬유소막%공혼
pervaporation%caprolactam-water mixtures%regeneration cellulose membrane%blend
己内酰胺(CPL)是重要的有机化工原料,对CPL脱水是除杂工艺中最后一步。然而,CPL是热敏性物质,为防止CPL高温分解,重点研究了渗透汽化膜分离技术对CPL脱水。以棉短绒为制膜原料,采用碱溶解方法,通过相转变制备了再生纤维素(RC)膜。研究了铸膜液浓度对膜结构的影响。铸膜液的最佳浓度为4 wt %,RC膜表面平滑、无孔,可作为渗透汽化膜,但纯RC膜的通量较小。因此,选取了聚乙烯醇(PVA)、聚乙烯吡咯烷酮(PVP)和β-环糊精(β-CD)分别对RC膜共混改性,考察了改性膜的溶胀度、接触角和渗透汽化膜分离性能。RC-PVA膜的机械强度、通量和分离因子均优于纯RC膜。β-CD提高了膜的分离因子,对通量影响较小。
己內酰胺(CPL)是重要的有機化工原料,對CPL脫水是除雜工藝中最後一步。然而,CPL是熱敏性物質,為防止CPL高溫分解,重點研究瞭滲透汽化膜分離技術對CPL脫水。以棉短絨為製膜原料,採用堿溶解方法,通過相轉變製備瞭再生纖維素(RC)膜。研究瞭鑄膜液濃度對膜結構的影響。鑄膜液的最佳濃度為4 wt %,RC膜錶麵平滑、無孔,可作為滲透汽化膜,但純RC膜的通量較小。因此,選取瞭聚乙烯醇(PVA)、聚乙烯吡咯烷酮(PVP)和β-環糊精(β-CD)分彆對RC膜共混改性,攷察瞭改性膜的溶脹度、接觸角和滲透汽化膜分離性能。RC-PVA膜的機械彊度、通量和分離因子均優于純RC膜。β-CD提高瞭膜的分離因子,對通量影響較小。
기내선알(CPL)시중요적유궤화공원료,대CPL탈수시제잡공예중최후일보。연이,CPL시열민성물질,위방지CPL고온분해,중점연구료삼투기화막분리기술대CPL탈수。이면단융위제막원료,채용감용해방법,통과상전변제비료재생섬유소(RC)막。연구료주막액농도대막결구적영향。주막액적최가농도위4 wt %,RC막표면평활、무공,가작위삼투기화막,단순RC막적통량교소。인차,선취료취을희순(PVA)、취을희필각완동(PVP)화β-배호정(β-CD)분별대RC막공혼개성,고찰료개성막적용창도、접촉각화삼투기화막분리성능。RC-PVA막적궤계강도、통량화분리인자균우우순RC막。β-CD제고료막적분리인자,대통량영향교소。
Caprolactam(C6H11NO)is one of the most important material in the polymer industry, de?hydration is the most important edulcoration technology in the final caprolactam purification. Howev?er,caprolactam is heat-sensitive substance, for prevention of degradation under high temperature, the dehydration of caprolactam with pervaporation (PVP) is studied. Cotton as membrane material and is firstly dessloved in the alkaline solution, then the regenerated cellulose(RC)is prepared by phase inversion method. The influence of concentration of casting solution on the membrane struc?ture is investigated. The results show that the 4 wt % cellulose concentration is suitable to prepare the PV membrane. But the flux and separation factor of pure RC membrane are not ideal. Therefore, polyvinyl alcohol(PVA),Polyvinyl-Py-rrolidone(PVP)and β-cyclodextrin(β-CD)are selected to modify the RC membrane. The degree of swelling,contact angle and PV performance of the modi?fied membranes are tested. RC-PVA has better properties and the strength,the flux and the separa?tion factor are improved. With the addition ofβ-CD,the separation factor of membrane is enhanced, and it has a little influence on flux.