Method for drying separation membrane and method for producing separation membrane structure
AssigneeNGK Insulators, Ltd.
InventorsKenichi Noda, Takeshi Hagio
Life of this patent
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Abstract
A drying method for a separation membrane includes supplying a gas for drying to the separation membrane so that a value obtained by dividing the difference between a maximum value and a minimum value of a flow rate of the gas for drying on a membrane surface of the separation membrane by the minimum value of the flow rate is less than or equal to 15%. The gas for drying is less than or equal to 40 degree C. and contains a water-soluble gas that has a solubility in 1 cm3 of water of greater than or equal to 0.5 cm3 in conditions of 40 degree C. and 1 atmosphere.
Claims10
A drying method for a separation membrane comprising:
- supplying a gas for drying to the separation membrane so that a value obtained by dividing the difference between a maximum value and a minimum value of a flow rate of the gas for drying on a membrane surface of the separation membrane by the minimum value of the flow rate is less than or equal to 15%;
- wherein the gas for drying is less than or equal to 40 degree C. and contains a water-soluble gas that has a solubility in 1 cm3 of water of greater than or equal to 0.5 cm3 in conditions of 40 degree C. and 1 atmosphere;
- and
- wherein a pressure of the gas for drying at the starting of a drying treatment is higher than a pressure of the gas for drying at the completion of a drying treatment.
A method of producing a separation membrane structure comprising:
- assembling a porous support on which a separation membrane is formed into a casing, and
- supplying a gas for drying which is less than or equal to 40 degree C. to the separation membrane, the gas for drying containing a water-soluble gas which has a solubility in 1 cm3 of water of greater than or equal to 0.5 cm3 in conditions of 40 degree C. and 1 atmosphere;
- wherein a pressure of the gas for drying at the starting of a drying treatment is higher than a pressure of the gas for drying at the completion of a drying treatment.
Dependencies are inferred from the claim text.