Purification process of raw material gas for production of synthetic ammonia or methanol production
A technology of raw material gas and purification process, applied in the direction of products, chemical instruments and methods, and separation of dispersed particles, which can solve the problems of insufficient adaptability and high cost of gas purification
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Embodiment 1
[0017] Embodiment 1: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps
[0018] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.4MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.6MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~1500...
Embodiment 2
[0024] Embodiment 2: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps
[0025] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.6 MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.6 MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~15...
Embodiment 3
[0031] Embodiment 3: a kind of purification process applied to the raw material gas of synthetic ammonia or methanol production, comprises the following steps
[0032] 1. Desulfurization, the shift gas from the shift system (mainly CO, CO 2 、H 2 、H 2 S, CH 4 ) at a pressure of 3.5MPa, first sent to the lower part of the desulfurization tower, and countercurrently contacted with the hindered amine desulfurization liquid entering the tower from the upper part of the tower, the H in the gas 2 S and some CO 2 absorbed by the solution. Purified gas H from desulfurization tower 2 S content is less than 10mg / Nm 3 , to the decarburization process. After decompression, the hindered amine liquid coming out from the bottom of the desulfurization absorption tower passes through the solution heat exchanger and enters the solution flash tank. Under the pressure of 0.5MPa, the H in the solution is 2 , CO, and part of CO 2 flashed out, the H in the flash gas 2 S content in 1000~1500...
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