| 摘要 |
PURPOSE:Methanol is pyrolyzed to a crude synthesis gas containing hydrogen, the hydrogen is separated and purified from the crude gas in its gas state, then liquefied by the sub-zero process, thus enabling simple and economical production of liquid hydrogen. CONSTITUTION:The liquid methanol pressurized at about 30 atmospheric pressure 4 is gasified by heating at 300-500 deg.C, passed through the catalyst layer in the pyrolysis 1 where the methanol is converted into a crude synthesis gas mainly composed of hydrogen and carbon monoxide. Then, the gas is cooled down and fed to the separation and purification process 2. Gases other than hydrogen, such as carbon monoxide, methane, carbon dioxide are removed by the PSA process and the resultant off-gas 8 is used as a heat source for the pyrolysis. The purified gas 6 is fed to the liquefaction process 3 at about room temperature and about 30 atmospheric pressure in about 99.99mol% hydrogen purity and liquiefied by self-cooling where the pressure of the pure gas 6 is utilized to drive the expansion turbine for the compression power in liquefaction, or by indirect cooling using a cooling medium such as nitrogen or helium. |
