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Preparation and Performance of Zeolites and Zeolite Membranes in Microreactors

Author: ShiChunYan
Tutor: ZhangXiongFu
School: Dalian University of Technology
Course: Chemical processes
Keywords: Electrophoretic deposition Composite membrane Micro-reactor Pervaporation Knoevenagel Condensation
CLC: TQ052
Type: Master's thesis
Year: 2006
Downloads: 155
Quote: 3
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Abstract


The micro-reactor is the core device of the micro-chemical technology, has a large specific surface area, and narrow the micro-channel and very small reaction space, studies show that the chemical reaction in the microscale under conditions the conversion rate and selectivity were significantly increased. The microreactor technology provides a new research and development of the concept and technology selection, high academic research significance and potential applications, and has been hailed as a revolution of the 21st century, the field of chemical engineering. Zeolite Membranes its tacticity a skeleton structure, a large specific surface area and efficient adsorption performance in the field of separation and catalytic widely applied. In recent years, people more concerned about the combination of zeolite membrane with micro-reactor in order to assemble the micro-membrane reactor, in order to achieve separation and catalytic miniaturized applications, can give full play membrane catalysis, membrane separation, and the micro reactor, the multiple advantages, but also One of the best ways for the catalytic activity in the micro-reactor components uniform load. Successfully prepared the papers in the micro-reactor catalytic properties and separation performance the NaA / NaY zeolite composite membrane, and examine its performance. The first application of the method of electrophoretic deposition (EPD) NaA zeolite seed uniformly deposited in the micro-channels of the micro-reactor, to prepare a better quality and separation performance of the NaA zeolite membrane after secondary hydrothermal synthesis. NaY zeolite particles synthesized uniform and compact introduced into the microchannel NaA zeolite membrane, secondary hydrothermal synthesis prepared the NaA / NaY composite membrane, through ion exchange to improve the catalytic performance of the NaY zeolite membrane. The pervaporation experiments to evaluate the micro-reactor the synthesized NaA separation membrane and the NaA / NaY composite membrane permeability compared different temperatures, different vacuum degree, the impact of different feed concentration on the permeate flux and the separation performance of zeolite membranes , to choose the best pervaporation conditions. During the inspection of feed concentration on the permeability Shihai contrast micro membrane reactor and ceramic membrane reactor permeate flux and separation factor, found that the permeability of the micro-membrane reactor is superior to the ceramic membrane tube. Catalytic application Knoevenagel condensation test micro-membrane reactor separation performance as well as a micro-reactor of the Comparative supported catalyst and the reaction yield of the ordinary reactor, the results show that the yield rate of the micro-membrane reactor can reach 93%; ordinary reactor because does not have the advantages of the micro-reactor of the low yield, even in longer reaction times and more amount of the catalyst, the yield is only 79%. In addition to micro-membrane reactor catalyst activity conducted a lengthy investigation, found that its activity is relatively stable.

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