Method for recovering hydrogen and ammonia from synthetic ammonia purge gas by membrane separation-rectification integrated technology and device
A technology of relaxation gas and membrane separation, which is applied in the direction of using solid contact hydrogen separation, hydrogen separation, ammonia preparation/separation, etc., can solve problems such as inability to process ammonia water, uneconomical production of ammonium bicarbonate, and efficient recycling of ammonia and discharge of ammonia water. , to achieve zero emissions, save resources, and solve environmental problems.
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[0067] The high-pressure and low-pressure relaxation gases are passed into the high-pressure ammonia absorption tower 1 and the low-pressure ammonia absorption tower 7 respectively, and at the same time, the absorbent is pumped into the high-pressure ammonia absorption tower 1 and the low-pressure ammonia absorption tower 7 through the high-pressure plunger pump 6 and the low-pressure centrifugal water pump 11 respectively. The ammonia in the purge gas is absorbed and treated. During the initial operation of the device, the absorbent is the desalted water sent from outside the device. After the stable operation, the absorbent is the liquid in the rectification tower 13. The ammonia content of the high-pressure relaxation gas after absorption treatment is lower than 200ppm, and the ammonia content of the low-pressure relaxation gas after absorption treatment is lower than 20ppm. The high-pressure and low-pressure relief gases after ammonia removal are respectively fed into the h...
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