Patent ID: 8196755

Claim:
A process for the production of a composite membrane comprising at least one microporous separation layer comprising a zeolite of the MFI type on a porous substrate, comprising: contacting a surface of the porous substrate in a hydrothermal treatment with a synthesis solution comprising at least one additive selected from the group consisting of linear (C 1 -C 4 )-alcohols, ammonia, primary, secondary and tertiary amines having in each case (C 1 -C 4 )-alkyl radicals, ethanolamine and (C 3 -C 4 )-ketones are added to the synthesis solution for the hydrothermal synthesis, wherein the synthesis solution has the following molar constituents, with A being said at least one additive: SiO 2 /Al 2 O 3 /Na 2 O/TPAOH/TPABr/H 2 O/A=1/5×10 −5 to 5×10 −2 /from 0 to 0.2/from 0.03 to 0.08/from 0.03 to 0.08/from (10−y) to (100−y)/y with 0<y ≦50, wherein the molar ratio of H 2 O to additive A in the synthesis solution is 100−1 : 1.