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Indexed by:Journal Papers

Date of Publication:2019-12-05

Journal:Huagong Jinzhan/Chemical Industry and Engineering Progress

Included Journals:EI、PKU

Volume:38

Issue:12

Page Number:5449-5456

ISSN No.:10006613

Abstract:The NaA zeolite has a regular pore structure and strong hydrophilicity which make it a favorable material for molecular transport. Favorable characteristics of this material can be used for the development of NaA zeolite membrane with an excellent selectivity for dehydration of organic matter. Secondary growth method was employed to improve the pervaporation performance of NaA zeolite membrane. The effects of alkalinity, crystallization temperature and crystallization time were investigated. The synthetic fluid was prepared according to the optimal conditions. A NaA zeolite membrane was prepared by adding methylcellulose and water with a ratio of 1:100. The SEM, XRD and pervaporation performance tests showed that the NaA zeolite membrane prepared by the improved method has a dense growth, compact structure and excellent pervaporation performance. The synthesized membrane exhibited a high flux and salt rejection of 8.33kg/(m2?h) and 99.95% at 75 for 0.6mol/L of NaCl aqueous solution respectively. The results showed that the NaA zeolite membranes for the desalination of 0.6mol/L of NaCl solution displayed a good stability over a period of 72 hours while the flux remains constant at 8.30kg/(m2?h) with a rejection rate of 99.90%. Moreover, the aqueous solution of ��(C2H6O) = 90% ethanol was separated by pervaporation at a temperature of 60 to 75. The flux of the zeolite membrane was increased from 1.55kg/(m2?h) to 2.56kg/(m2?h). The rejection rate was maintained around 99.90%. ? 2019, Chemical Industry Press. All right reserved.