Separation membrane
AssigneeMitsubishi Chemical Corporation
InventorMasanobu AIZAWA
Life of this patent
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Abstract
[Subject] The aim is to provide a separation membrane which can fulfill both high separation capability and high permeation rate. [Solving Means] The disclosed is separation membrane which comprises a porous substrate which is made of ceramic sintered body of which a main ingredient is alumina, and a zeolite membrane which is formed over the surface of the porous substrate, wherein the porous substrate comprises a base layer and a foundation layer which is formed on the base layer and is formed for the zeolite membrane, and the separation membrane is characterized in that a mean pore diameter of the foundation layer is smaller than a mean pore diameter of the base layer.
Claims13
1-14. (canceled)
Separation membrane for separating water from organic solvent comprising
- a porous substrate which is made of ceramic sintered body of which a main ingredient is alumina, and
- a zeolite membrane which is formed over the surface of the porous substrate,
- wherein the porous substrate comprises a base layer and a foundation layer which is formed on the base layer, wherein the zeolite membrane is formed on the foundation layer, and
- wherein the separation membrane is characterized in that a mean pore diameter of the base layer is in the range of 4-12 μm, and a mean pore diameter of the foundation layer is in the range of 0.4-1.2 μm,
- wherein thickness of the foundation layer is in the range of 10-200 μm, wherein a nitrogen gas permeation rate through the porous substrate is in the range of 200-7000 m3/(m2·h·atm),
- wherein a flux Q which is a permeation rate of water is 5.0 kg/(m2·hr) or more, and a separation factor α of said separation membrane is 1000 or more,
- wherein, in the separation of a first material and a second material, the separation factor α is expressed by the following equation (1),
- α=(B1/B2)/(A1/A2) (1)
- wherein A1 represents the concentration % by weight of the first material before separation, A2 represents the_oncentration % by weight of the second material, B1 represents the concentration % by weight of the first material in a liquid or gas having permeated through the separation membrane, and B2 represents the concentration % by weight of the second material.
Dependencies are inferred from the claim text.