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Cleaner process for synthesis of zeolite MCM‐22 by vapor‐phase transport method
Author(s) -
Liu Xingsheng,
Li Yingxia,
Chen Biaohua,
Wang Ying
Publication year - 2009
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.300
Subject(s) - zeolite , liquid phase , chemical engineering , fourier transform infrared spectroscopy , crystallinity , phase (matter) , aluminosilicate , reuse , chemistry , process (computing) , materials science , organic chemistry , waste management , catalysis , computer science , engineering , physics , thermodynamics , operating system
A cleaner process for synthesis of zeolite MCM‐22 by vapor‐phase transport method was studied in this paper. Firstly, zeolite MCM‐22 was synthesized at different hexamethyleneimine (HMI) dosages by vapor‐phase transport (VPT) method. It was concluded that the aluminosilicate gel was not crystallized completely and the product crystallinity was low when the HMI/gel mass ratio was <0.3. Then, the as‐synthesized product and the surplus liquid, which were obtained at mass ratio 0.3 HMI : 1.0 gel, were characterized by TG‐DTA and FTIR, respectively. It was found that a part of HMI did not play the role of structure‐directing and remained in the surplus liquid after synthesis of zeolite MCM‐22. The surplus liquid chemical properties, which have not change after synthesis of zeolite MCM‐22 by VPT method, still contained only HMI and H 2 O. Re‐adding of HMI and deionized water, the surplus liquid was reused to synthesize zeolite MCM‐22 by VPT method. Based on the experimental results of surplus liquid reuse, it was known that the surplus liquid can be reused via re‐adding of HMI and deionized water. It could make the VPT method become a cleaner process. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.