Patent ID: 6582495
Filing Date: 2003-06-24
Classification: B01D,B01J

Abstract:
A process for preparing a supported zeolite membrane comprising a composite continuous zeolite/support layer of controlled thickness, wherein the zeolite is principally localized in pores of a porous support and optionally on the external surface thereof, wherein said method comprises forming a precursor gel of said zeolite, contacting said porous support with said gel and crystallizing said zeolite, wherein said zeolite is crystallised by carrying out a non-isothermal thermal program comprising at least three steps in succession: a first constant temperature stage carried out at a temperature in the range of 50Â° C. to 300Â° C., followed by cooling step to a temperature of less than 50Â° C., itself followed by a second constant temperature stage carried out at a temperature in the range of 50Â° C. to 300Â° C.