正在加载图片...
第6期 杜雄伟等：变压膜渗透空气分离制氨 621. 参考文献 [6]Feng X.Pan C Y,Ivory J.et al.Integrated membrane/adsorp- tion process for gas separation.Chem Eng Sci,1998.53(9): [1]Paul DR.Membrane separation of gases using steady eyclic oper- 1689 ation.Ind Eng Chem Process Dev.1971.10(3):375 [7]时均，袁权，高从谐膜技术手册，北京：化学工业出版社， [2]Bechman I N,Shelekhin A B.Separation of gas mixtures in un- 2001,539 steady-state conditions.J Membr Sci,1991.55:283 [8]Ettouney H M,Majeed U.Effect of cell configuration on separa- [3]Kao Y K,YanZ,Li L.et al.A pressure swing membrane sepa- ration.Gas Sep Purif,1991,5:151 tion characteristics of gas mixtures by polymeric membranes.Sep Purif Technol.1997.11:103 [4]Ueda K.Haruna K.Inoue M.Process for separating gas:US. 4955998.199009-11 [9]Feng X,Ivory J,Rajan VS V.Air separation by integrally asym metrie hollow fiber membranes.AIChE J.1999.45(10):724 [5]Feng X.Pan C Y.Ivory J.Pressure swing permeation:novel process for gas separation by membranes.AIChE J.2000.46 [10]Ettouney H M,El-Dessouky HT,Waar W A.Separation char acteristics of air by polysulfone hollow fiber membranes in series. (4):724 J Membr Sci.1998.148:105 Separation of nitrogen from air by pressure swing membrane permeation DU Xiongwei,LIU Yingshu Mechanical Engineering School.University of Science and Technology Beijing.Beijing 100083,China ABSTRACI A novel unsteady-state membrane permeation process was proposed based on steady-state perme- ation.The process is composed of three basic cyclic steps:feed pressurized,permeate withdrawn,and residue vented.The effects of pressurization time,evacuation time and venting time on the average purity,productivity and recovery of nitrogen were experimentally investigated for air separation to produce nitrogen by this process. The effectiveness of the process was compared with that of steady-state permeation.The results show that the average purity,productivity and recovery of nitrogen increase with the prolonging of pressurization time under the experimental conditions.The average purity of nitrogen-enriched gas is increased but its productivity and re- covery are decreased when the evacuation time is extended.An appropriate increase in venting time is associated with the increases of average purity,productivity and recovery of nitrogen.When the venting time is too long, the productivity and recovery will be decreased.As a result,the proposed process in this paper can achieve a higher purity of nitrogen but a lower productivity and recovery. KEY WORDS air separation:membrane;pressure swing permeation;steady "stage;unsteady state参 考 文 献 ［1］ Paul D R．Membrane separation of gases using steady cyclic operation．Ind Eng Chem Process Dev197110（3）：375 ［2］ Bechman I NShelekhin A B．Separation of gas mixtures in unsteady-state conditions．J Membr Sci199155：283 ［3］ Kao Y KYan ZLi Let al．A pressure swing membrane separation．Gas Sep Purif19915：151 ［4］ Ueda KHaruna KInoue M．Process for separating gas：US 4955998．1990－09－11 ［5］ Feng XPan C YIvory J．Pressure swing permeation：novel process for gas separation by membranes．AIChE J200046 （4）：724 ［6］ Feng XPan C YIvory Jet al．Integrated membrane／adsorption process for gas separation．Chem Eng Sci199853（9）： 1689 ［7］ 时均袁权高从 ．膜技术手册．北京：化学工业出版社 2001：539 ［8］ Ettouney H MMajeed U．Effect of cell configuration on separation characteristics of gas mixtures by polymeric membranes．Sep Purif Technol199711：103 ［9］ Feng XIvory JRajan V S V．Air separation by integrally asymmetric hollow-fiber membranes．AIChE J199945（10）：724 ［10］ Ettouney H ME-l Dessouky H TWaar W A．Separation characteristics of air by polysulfone hollow fiber membranes in series． J Membr Sci1998148：105 Separation of nitrogen from air by pressure swing membrane permeation DU XiongweiLIU Y ingshu Mechanical Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China ABSTRACT A novel unsteady-state membrane permeation process was proposed based on steady-state permeation．The process is composed of three basic cyclic steps：feed pressurizedpermeate withdrawnand residue vented．The effects of pressurization timeevacuation time and venting time on the average purityproductivity and recovery of nitrogen were experimentally investigated for air separation to produce nitrogen by this process． The effectiveness of the process was compared with that of steady-state permeation．The results show that the average purityproductivity and recovery of nitrogen increase with the prolonging of pressurization time under the experimental conditions．The average purity of nitrogen-enriched gas is increased but its productivity and recovery are decreased when the evacuation time is extended．An appropriate increase in venting time is associated with the increases of average purityproductivity and recovery of nitrogen．When the venting time is too long the productivity and recovery will be decreased．As a resultthe proposed process in this paper can achieve a higher purity of nitrogen but a lower productivity and recovery． KEY WORDS air separation；membrane；pressure swing permeation；steady-stage；unsteady-state 第6期 杜雄伟等： 变压膜渗透空气分离制氮 ·621·