Patent ID: 9656211
Date: 2017-05-23
CPC Classifications: B01D,Y02A,Y02C,Y02P

Claim:
1. A method for regenerating a carbon dioxide absorbing liquid in a carbon dioxide recovery method, comprising: a carbon dioxide absorption step of bringing a gas to be treated containing carbon dioxide into contact with a carbon dioxide absorbing liquid, thereby removing carbon dioxide from the gas to be treated, and a regeneration step of removing carbon dioxide from a rich solution that has absorbed carbon dioxide in the carbon dioxide absorption step, thereby regenerating the carbon dioxide absorbing liquid, the rich solution that has absorbed carbon dioxide is guided in liquid form to a membrane separation apparatus that is selectively permeable to carbon dioxide and equipped with a zeolite membrane for carbon dioxide separation, carbon dioxide is separated and removed by a pervaporation method, and the carbon dioxide absorbing liquid is thus regenerated, the membrane separation apparatus being a multi-tube separation membrane module, the multi-tube separation membrane module having a double-tube structure including a tubular zeolite membrane element for separating carbon dioxide and an outer tube coupled thereto and having the function of sending a heat source into the shell space outside the outer tube, thereby heating the outer tube and the tubular zeolite membrane element for carbon dioxide separation, the membrane separation apparatus being equipped with a flow path for: treating a high-temperature gas, and receiving a high-temperature gas to be treated that is originally to be treated as a heat source in the flow path as the amount of heat required for the membrane separation of carbon or moisture by a pervaporation device.