Can connecting a PSA unit directly after low-temperature methanol washing meet the hydrogen production demand?
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Can directly connecting a PSA unit after low-temperature methanol washing meet the hydrogen production requirements, or is deep cooling or methanation still necessary?
This post was last edited by Nine Heavens is me on 2020-2-12 at 13:48. It depends on the specifications of your product, as well as the degree of conversion. For pure hydrogen, the process of water gas → complete conversion → low-temperature methanol washing → PSA is perfectly fine. If CO is also to be produced, then it goes through water-gas shift → partial conversion → low-temperature methanol washing → deep cryogenic separation of CO (yielding two streams of gas: 1 is the product CO, and 2 is the hydrogen-rich gas sent to PSA).
In terms of the purity of the gas after low-temperature methanol washing, it is theoretically possible to connect it directly to Psa, but each case needs to be analyzed on its own. This requires considering the entire manufacturing process and the product itself, as well as the return on investment; it’s not something that can be resolved simply by asking whether it’s possible or not.
Our plant has a process sequence of water gas → partial reforming → low-temperature methanol washing → deep cryogenic separation of CO; and another sequence of water gas → partial reforming → low-temperature methanol washing → PSA. There are two production lines, with the main product being CO, while the hydrogen-rich gas is sent to another PSA unit for hydrogen production
PSA can be used directly, with a hydrogen purity of up to 99.80%