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    • 3. 发明申请
    • GAS TREATMENT PROCESS AND GAS TREATMENT APPARATUS
    • WO2020249770A1
    • 2020-12-17
    • PCT/EP2020/066365
    • 2020-06-12
    • CRANFIELD UNIVERSITY
    • MCADAM, Ewan
    • B01D53/14B01D53/22B01D53/62
    • A process a system for treatment of an input gas are disclosed. The input gas (e.g. biogas) comprises carbon dioxide. First and second gas-liquid contact stages each comprise one or more gas-liquid hollow fibre membrane contactors permeable to carbon dioxide, each with a gas side and a liquid side. The input gas flows through the gas side of the first gas-liquid contact stage. A first carbon dioxide absorption solution, comprising ammonia, is circulated through the liquid side of the first gas-liquid contact stage, to absorb some of the carbon dioxide from the input gas to leave an intermediate gas flowing out of the first gas-liquid contact stage. The intermediate gas flows through the gas side of the second gas-liquid contact stage. A second carbon dioxide absorption solution, comprising ammonia, circulates through the liquid side of the second gas-liquid contact stage, to absorb carbon dioxide from the intermediate gas to leave an output gas flowing out of the second gas-liquid contact stage. The process is controlled so that more precipitation of ammonium bicarbonate occurs in the first carbon dioxide absorption solution, per unit volume of first carbon dioxide absorption solution, than in the second carbon dioxide absorption solution, per unit volume of second carbon dioxide absorption solution.