Separation Device And Method For Designing Separation Device

A method for designing a separation device that selectively separates a carbon dioxide gas from a supply gas containing the carbon dioxide gas and a nitrogen gas, the method for designing a separation device comprising:

• selecting a separation membrane including a porous body and a resin layer disposed on the porous body and configured to allow the carbon dioxide gas contained in the supply gas to permeate toward the porous body;
• and
• designing an accommodation portion holding the separation membrane and formed with an accommodation space for accommodating a permeation gas that permeates the separation membrane, a pipe coupled to the accommodation portion, and a pump configured to reduce a pressure in the accommodation space via the pipe and draw in the permeation gas, wherein
• a flow path of the permeation gas between the separation membrane and the pump includes the accommodation space and an internal space of the pipe,
• in the selecting, the separation membrane satisfying 500,000 GPU≥A≥1,000 GPU is selected, in which A is carbon dioxide gas permeability of the separation membrane, and
• in the designing,
• the pump configured to reduce the pressure in the accommodation space is selected such that (P1/P2)/(A/B)≥1, in which B is nitrogen gas permeability of the separation membrane, P1 is a total pressure of the supply gas, and P2 is a total pressure of the permeation gas in the accommodation space, and
• the flow path is designed such that 1>(B+C)/(A+C)≥0.8, in which C is gas permeability of the flow path.