| 摘要 |
PURPOSE:To obtain a separation membrane excellent in heat resistance, chemical resistance and durability, generating no crack and suitable for the separation of gas, by forming a metallic or ceramic membrane having fine pores with a specific pore size to the surface of a vitreous porous body obtained by the phase splitting treatment of glass. CONSTITUTION:Phase splittable glass of a Na2O-B2O3-SiO2 system is applied to a flat plate 2 comprising a ceramic porous body and melted under heating to form a glass layer 3 while the coated flat plate is treated in a reaction tube by a gaseous phase method to form a membrane having uniform fine pores with a pore size of 5-2,000Angstrom comprising Al2O3 to the surface of the glass layer 3. Next, the glass layer 3 is subjected to phase splitting treatment so as to a adjust the cross sectional area of the glass phase rich in alkali to 10-5,000Angstrom under a regulated phase splitting treatment condition. Thereafter, elution treatment is performed to elute the glass phase rich in alkali to obtain a separation membrane comprising a vitreous porous body 8 rich in silica having a reticulated fine pores 7 with a pore size of 10-5,000Angstrom while the membrane 4 is left on the surface thereof.
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