Process routes for producing hydrogen from methanol
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The process pathway for producing hydrogen from methanol – What is the specific reaction principle behind this process? What is the cost of hydrogen produced in this way, and compared to the cost of producing hydrogen via pressure swing adsorption using coke oven gas, which option is more cost-effective?
Gasification is sufficient; it’s a bit of a waste of energy
It might cost 3-4 yuan per Nm3, which isn’t cost-effective.
The methanol-to-hydrogen conversion technology uses methanol and deionized water as primary raw materials; methanol vapor is converted in a catalyst bed into a conversion gas that mainly contains hydrogen and carbon dioxide. This conversion gas is then purified using pressure swing adsorption technology to produce hydrogen with a purity of 99.99%. This technology consists of two parts: methanol conversion technology and pressure swing adsorption purification technology. It’s a bit of a waste. The common methods for producing hydrogen are: industrially, it is produced by generating water gas, while in the laboratory, it is produced by electrolyzing water. Using the produced methanol to generate hydrogen results in a huge waste of energy. It’s definitely not as efficient as producing water gas directly.
There are two methods for producing hydrogen from methanol: one is the pyrolysis of methanol to produce hydrogen: CH4O → CO + 2H2; the other is the aqueous hydrolysis of methanol to produce hydrogen: CH4O + H2O → 3H2 + CO2. The cost of hydrogen depends mainly on the price of methanol. It is cheaper compared to coke oven gas
:) The cost of producing hydrogen through methanol cracking depends mainly on the market price of methanol. At current market rates, the cost of producing 1 cubic meter of hydrogen via this method is around 1.6–1.7 yuan. As for producing hydrogen from coke oven gas, the operating costs are certainly lower compared to methanol cracking, but the investment cost for this method is very high, exceeding three times that of methanol cracking – or even more!