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Using polysulfone (PSF) hollow fiber ultrafiltration membranes as the substrate, sodium alginate (SA) and poly-vinyl alcohol (PVA) blend solutions as the coating solution, and maleic anhydride (MAC) as the cross-linked agent, SA-PVA/PSF hollow fiber composite membranes were prepared for the dehydration of ethanol-water. The effects of differentsodium alginate concentration in the coating solutions and different operating temperatures on pervaporation performance wereinvestigated. The experimental results showed that pervaporation performance of the SA-PVA/PSF composite membranesfor ethanol-water solution exhibited a high separation factor although they had a relatively low permeation flux. As SAconcentration in SA-PVA coating solution was 66.7% and the operating temperature was 40 C, SA-PVA/PSF hollow fibercomposite membrane (PS4) had a separation factor of 886 and flux of 12.6 g/(m2.h). Besides, SA-PVA/PSF hollow fibercomposite membranes (PS3 and PS4) were used for the investigation of the effect of ethanol concentration in the feed solutionon pervaporation performance. 相似文献
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用于乙醇-水分离的SA-PVA/PSF中空纤维渗透汽化复合膜 总被引：1，自引：1，他引：0
Using polysulfone (PSF) hollow fiber ultrafiltration membranes as the substrate, sodium alginate (SA) and polyvinyl alcohol (PVA) blend solutions as the coating solution, and maleic anhydride (MAC) as the cross-linked agent, SAPVA/PSF hollow fiber composite membranes were prepared for the dehydration of ethanol-water. The effects of different sodium alginate concentration in the coating solutions and different operating temperatures on pervaporation performance were investigated. The experimental results showed that pervaporation performance of the SA-PVA/PSF composite membranes for ethanol-water solution exhibited a high separation factor although they had a relatively low permeation flux. As SA concentration in SA-PVA coating solution was 66.7% and the operating temperature was 40 ℃, SA-PVA/PSF hollow fiber composite membrane (PS4) had a separation factor of 886 and flux of 12.6 g/(m2·h). Besides, SA-PVA/PSF hollow fiber composite membranes (PS3 and PS4) were used for the investigation of the effect of ethanol concentration in the feed solution on pervaporation performance. 相似文献
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NomenclatureCsh—solventconcentrationinanascenthollowfiber ( g·cm-3 )fo—dragcoefficientattheexternalsurfaceofanascenthollowfiberF( γE)—materialfunctiondefined (Eq .( 2 ) )g—gravitationalfunction ( 980cm·s-2 )G(Csh)—materialfunctiondefined (Eq .( 2 ) )Ho—thecombinedreciprocalradiiofthecurvaturesattheouterskinofthenascenthollowfiber (cm-1)L—air gapdistance (cm )Ri—innerradiusofanascenthollowfiber (cm)Ro—outerradiusofanascenthollowfiber (cm)R′o,R″o—thefirstandsecondorderderivat… 相似文献
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1Introduction Generally,ultrafiltration(UF)asaseparationtech nologyofhighefficiencyandlowenergyconsumption haswidelybeenappliedinvariousindustries.Inin dustrialapplications,therearesixbasicUF modules[1]:(1)tubular,withinnerchannel diameters>4mm;(2)hollowfibers,withinnerdia metersof0.2-3mm;(3)plateunits;(4)spiral woundmodules;(5)pleated sheetcartridges;and(6)rotarymodules.However,hollowfiberUFmoduleis oneofmostimportantmodulesbecauseofitshigh areapackingdensity.Besides,UFtechnologyalsois us… 相似文献
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The intrinsic viscosity and viscometric interaction parameters of perfluorosulfonic acid(PFSA) and poly(vinyl alcohol)(PVA) were measured by dilute solution viscometry.The miscibility between PFSA and PVA was estimated by the criteria of △B and μ.The results indicated that PFSA and PVA were completely miscible for any weight fraction in aqueous solution. 相似文献
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In an effort to find the effect of mass transfer ,surface tesion and drag forces on the velocity distribution,the mathematical model of the velocity profile of a nascent hollow fiber during membrane formation in the air gap region was numerically simulated by using the Runge-Kutta method (fourth-order method).The effect of mass transfer on velocity distribution based on the complicated function(G(Ch^s))was presented and the dffects of a complicated function were studied in two cases:in the first case,G(Ch^s) was constant;in the second,G(Ch^s) was variable.The latter was done by varying with the concentration of solvent in a nascent hollow fiber through the air-gap region.One empirical equation was used to describe this change and the predected values had a better agreement with the experimental values.To verify the moedl hypotheses,hollow fiber membranes were spun from 20:80 polybenzimidazole/polyetherimide dopes with 25.6 wt％ solid in N,N-dimethylacetamide (DMAc) using water as the external and internal coagulants.Based on the experimental results of dry-jet wet-spinning process for the fabrication of hollow fiber membranes,it is found that the model calculated values were in a good agreement with the experimental values. 相似文献
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日中高校专业教育的对比 总被引：1，自引：0，他引：1
一、教学内容方面的差异日本高校专业教育的内容比较广泛，如日本秋田大学采矿学科的专业教学内容包括：矿物开采、矿物加工、矿山通风与安全、环境保护及相关工程的基础知识等，面非常宽，但每门知识不深、不细、不精，有些也只作梗概介绍。基本是原理性的东多，具体工艺性的东少；类型、功能、系统涉及的多，选型计算、设备力学计算及参数设计等涉及的少。再如日本秋田大学采矿学科教学内容里涉及到的运输设备及系统等，多达几乎囊括所有的运输设备及系统，而我国同类学科的教学内容里所涉及到的运输设备及运输系统，却仅仅是并下和工业广… 相似文献
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