JPS57122025A - Utilizing method of surplus gas - Google Patents

Abstract

PURPOSE: To adjust the supply and demand of a surplus gas advantageously, by adjusting components in the surplus gas formed as by-product in an iron mill, etc. to a specific volume ratio H₂/CO, methanizing the adjusted gas, partially oxidizing the methanized gas to give methanol gas, cooling the gas to ordinary temperature, and easily liquefying and storing the surplus gas.

CONSTITUTION: A coke oven gas (COG) 1 formed as a by-product in an iron mill, etc. is mixed with a converter gas (LDG) 2 in a gas mixer 9 to adjust the volume ratio between H₂ and CO to ≥3. The adjusted mixture is then passed through a methanizing reaction column 10 to give a gas rich in methane. The gas is then dehdrated in a dehydrating column 11 and decarbonated in a decarbonating column 12 Oxygen or air 14 is added to the decarbonated gas in an amount of the upper explosion limit or above, and the gas is partially oxidized in the presence of a chromium oxide as a catalyst in a methanol reaction colum 13 to afford the methanol gas. The resultant methanol gas is then cooled to ordinary temperature in an indirect cooler 15 to give liquid methanol 17. According to the method, methanol is obtained by the partial oxidation of the methane at a relatively low pressure, and the surplus gas can be easily liquefied and stored. Thus, the mthanol is useful for adjusting the supply and demand of the surplus gas in the season of low electric power demand.

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