Method for integral production of liquid ammonia and methanol and/or dimethyl ether by using coke oven gas as raw material
A technology of dimethyl ether and coke oven gas, applied in chemical instruments and methods, preparation/separation of ammonia, preparation of organic compounds, etc., can solve the problems of recycling, full utilization, unsolved resources, etc., and achieve recycling , the effect of reducing investment and reducing consumption
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Embodiment 1
[0044] With reference to Fig. 1, take the coke oven gas as the method concrete implementation of raw material integrated production liquid ammonia and methyl alcohol and dimethyl ether as follows:
[0045] A. Coke oven gas undergoes wet desulfurization to remove sulfur to obtain coke oven gas 1 with a sulfur content of 4-6ppm, which is then compressed and boosted to 0.6-4.5MPa to obtain coke oven gas 2; Gas 7 is preheated to 300-380°C to enter fine desulfurization, and sulfur is removed to less than 0.1PPm to obtain coke oven gas 4. Steam is added to coke oven gas 4 in a certain proportion, and the molar ratio of total carbon in it is controlled to be 0.8 ~4.0; the mixture of coke oven gas 4 and steam is preheated with synthetic gas 7 from the heat exchange reformer tube, and then enters the heating furnace for further preheating to obtain a temperature of 420-660°C and a pressure of 0.6-4.5MPa The heated mixed gas 5, the mixed gas 5 enters the heat exchange reformer tube, whe...
Embodiment 2
[0069] With reference to Fig. 1, the method for the integrated production of liquid ammonia and methanol with coke oven gas as raw material is specifically implemented as follows:
[0070] Steps A and B are the same as in Example 1, the difference is only that the CO containing CO is added to the secondary reformer 2 There are two streams of gas flow: one is methanol synthesis relaxation gas separated by PSA to H 2 rich CO 2 Gas 9, the second is CO-containing gas recovered from the flue gas of the heating furnace 2 Gas 23;
[0071] Contain a large amount of H in the methanol synthesis purge gas 10 in C, step B 2 , separated by improved pressure swing adsorption (PSA) into three streams, one of which contains H 2 Stream 18, which contains H 2 The gas is subjected to methanation refining treatment to remove the accompanying H 2 The trace amount of CO and CO carried by the gas 2 , so that CO+CO in this gas stream 2 ≤10PPm; then press H 2 / N 2 = 3:1 ratio with pure N 2 ...
Embodiment 3
[0074] With reference to Fig. 1, take coke oven gas as the method concrete implementation of raw material integrated production liquid ammonia and dimethyl ether as follows:
[0075] Steps A and B are identical with embodiment 1;
[0076] Contain a large amount of H in the methanol synthesis purge gas 10 in C, step B 2 , separated by improved pressure swing adsorption (PSA) into three streams, one of which contains H 2 Stream 18, which contains H 2 The gas is subjected to methanation refining treatment to remove the accompanying H 2 The trace amount of CO and CO carried by the gas 2 , so that CO+CO in this gas stream 2 ≤10PPm; then press H 2 / N 2 = 3:1 ratio with pure N 2 Gas, and boost the pressure to 8.0-22.0MPa for ammonia synthesis to obtain liquid ammonia and discharge ammonia to synthesize relaxation gas 25. When increasing the production of synthetic ammonia, part of the H can be extracted from the desulfurized coke oven gas 2 for and containing H 2 The two str...
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