Patent ID: 8568518
Filing Date: 2013-10-29
Classification: B01D

Abstract:
1. A method for making a crystalline silicoaluminophosphate-34 (SAPO-34) membrane, wherein the method comprises the steps of: (a) providing a porous support having a surface and a pore size distribution such that a small proportion of the pores of the porous support have a pore diameter larger than 10 microns; (b) seeding the porous support with SAPO-34 seed crystals to provide a seeded support by capillary suspension infiltration, which comprises the steps of: making a stable seed crystal suspension, which comprises SAPO-34 particles at a concentration in the range of from 0.01 to 10 wt % of the stable seed crystal suspension, wherein the SAPO-34 particles within the stable seed crystal suspension have characteristics such that the ratio of an average particle size of the SAPO-34 particles contained within the stable seed crystal suspension to an average pore diameter of the pores of the porous support is no more than 1, and contacting the surface of the porous support with the stable seed crystal suspension for a period of at least 1 second; and (c) growing a SAPO-34 membrane layer on the surface of the seeded support using secondary growth crystallization.