Patent ID: 8302782
Filing Date: 2012-11-06
Classification: B01D,Y02C,Y10T

Abstract:
1. A method for making a crystalline silicoaluminophosphate 34 (SAPO-34) membrane, the method comprising the steps of: a) providing a porous support having a surface; b) applying a first quantity of SAPO-34 crystalline material to at least part of the surface of the porous support prior to step e), wherein the first quantity of crystalline material is in the form of loose SAPO-34 crystals, the average size of the SAPO-34 crystals being from 0.25 microns to 5.0 microns; c) preparing an aqueous SAPO-34 forming gel, wherein the gel comprises aluminum, phosphorus, silicon, oxygen, a first and a second organic templating agent and water, with the ratio of silicon to aluminum being greater than 0.1, wherein the gel composition comprises 1.0 Al d) aging the gel for at least twenty four hours; e) contacting the porous support with the aged gel; f) heating the porous support and the gel to form a second quantity of SAPO-34 crystalline material on the support, thereby forming a cumulative layer of SAPO-34 crystals on the surface of the support; and g) calcining the SAPO-34 layer to remove the templating agents.