Method of producing composite for acid gas separation and apparatus for producing same
A method of producing a composite for acid gas separation by roll-to-roll process, including: a preparation step for preparing a coating liquid, containing a hydrophilic compound, an acid gas carrier and water, for formation of an acid gas separation facilitated transport membrane; a coating step for coating onto the support the coating liquid for formation at a liquid membrane thickness of 0.3 mm to 3.0 mm; a winding step for drying the coated liquid membrane in a drying oven to form the acid gas separation facilitated transport membrane, and winding around a winding roll the composite formed through formation of the acid gas separation facilitated transport membrane on the support, wherein humidity in a winding step unit in which the winding step is performed is measured to control the humidity to be 10% to 60%, and the winding step is performed under the controlled humidity conditions.
1. A method of producing a composite for acid gas separation, the composite provided with an acid gas separation facilitated transport membrane having a function of separating an acid gas in a raw material gas on a porous support, according to a roll-to-roll process, comprising:
a coating liquid preparation step for preparing a coating liquid for formation of the acid gas separation facilitated transport membrane containing a hydrophilic compound, an acid gas carrier and water;
a coating step for coating onto the porous support the coating liquid for formation at a liquid membrane thickness of 0.3 mm to 3.0 mm;
a drying step for drying the coated liquid membrane in a drying oven to form the acid gas separation facilitated transport membrane; and
a winding step for winding around a winding roll the composite for acid gas separation formed through formation of the acid gas separation facilitated transport membrane on the porous support,
wherein humidity in a winding step unit in which the winding step is performed is measured to control the humidity to be 10% or more and 60% or less,
wherein the winding step is performed under the controlled humidity conditions, and
wherein temperature is adjusted to 60° C. or higher at a side of an inlet of the drying oven and becomes higher in the range of 120° C. or lower toward a side of discharge of the oven.
2. The method of producing the composite for acid gas separation according to claim 1 , wherein the humidity is controlled to be 10% or more and 40% or less.
3. The method of producing the composite for acid gas separation according to claim 1 , wherein a laminated membrane comprising a hydrophobic porous membrane and a nonwoven fabric is used as the porous support, and
the coating liquid for formation is coated onto the hydrophobic porous membrane of the laminated membrane.
4. The method of producing the composite for acid gas separation according to claim 1 , wherein the hydrophilic polymer is a polyvinyl alcohol-polyacrylic acid copolymer.
5. The method of producing the composite for acid gas separation according to claim 1 , wherein the acid gas carrier contains a compound containing at least one selected from alkali metal carbonate.
6. An apparatus for producing a composite for acid gas separation, the composite provided with an acid gas separation facilitated transport membrane having a function of separating an acid gas in a raw material gas on a porous support, according to a roll-to-roll process, comprising:
a coating unit for coating onto the porous support a coating liquid for formation of the acid gas separation facilitated transport membrane, the coating liquid containing a hydrophilic compound, an acid gas carrier and water, at a liquid membrane thickness of 0.3 mm to 3.0 mm;
a drying unit for drying the coated liquid membrane in a drying oven to form the acid gas separation facilitated transport membrane; and
a winding step unit for winding around a winding roll the composite for acid gas separation formed through formation of the acid gas separation facilitated transport membrane on the porous support,
wherein the winding step unit is provided with a humidity detector for measuring humidity in the winding step unit, a humidity adjusting unit for adjusting the humidity to be 10% or more to 60% or less, and a control unit for controlling adjustment by the humidity adjusting unit according to the humidity measured by the humidity detector, and
wherein temperature is adjusted to 60° C. or higher at side of an inlet of the drying oven and becomes higher in the range of 120° C. or lower toward a side of discharge of the oven.