NOVELTY - Making a zeolite membrane sheet, comprises: applying a uniform seeding layer having a thickness of less than 3 mu m, comprising zeolite crystals having an average diameter of less than or equal to 1 mu m to a bare metal surface of a front side of a porous metal support sheet; and hydrothermally forming an inter-crystal growth layer by immersion of the support sheet with the seeding layer in a zeolite growth solution, where the inter-crystal growth layer incorporates the seeding layer, comprising the same zeolite as the zeolite crystals and having a thickness of less than or equal to 3 mu m.    USE - The method is useful for preparing zeolite membrane sheet (claimed), which is useful: for the separation of mixtures containing water, alcohols or organics; and in process of water removal, ethanol or high alcohol production from biomass, carbon dioxide (CO2) capture from a gas mixture, and removal of particular hydrocarbons from solvents or hydrocarbon mixtures.    ADVANTAGE - The method ensures economical and energy efficient manufacture of zeolite membrane sheet with improved separation performance, high flux and selectivity, chemical and thermal stability, mechanical flexibility and strength and high surface area packing density.    DETAILED DESCRIPTION - Making a zeolite membrane sheet, comprises: applying a uniform seeding layer having a thickness of less than 3 mu m, comprising zeolite crystals having an average diameter of less than or equal to 1 mu m to a bare metal surface of a front side of a porous metal support sheet, where the support sheet comprises an average pore size of less than 3 mu m, a porosity of 25-75% and a thickness of less than or equal to 200 mu m; and hydrothermally forming an inter-crystal growth layer by immersion of the support sheet with the seeding layer in a zeolite growth solution, where the inter-crystal growth layer incorporates the seeding layer, comprising the same zeolite as the zeolite crystals and having a thickness of less than or equal to 3 mu m. An INDEPENDENT CLAIM is included for a zeolite membrane sheet comprising the seeding layer and the inter-crystal growth layer.    DESCRIPTION OF DRAWING(S) - The figure shows a plate-type membrane module.    Two membrane sheets (801)    Zeolite membrane-coated surface (802)    Internal opening (803)    Feed water/hydrocarbon mixture (804)    Permeate. (805)