About 15 billion N m 3 coke oven gas (COG) is emitted into the air in Shanxi Province in China as air pollutants. It is also a waste of precious chemical resources. In this study, COG was purified respectively by four methods including refrigeration, fiberglass, silica gel, and molecular sieve. Purified COG was separated by a prism membrane into two gas products. One consists mainly of H 2 (>90 vol %) and the other is rich in CH 4 (>60 vol %) with their exact compositions to vary with the membrane separation pressure and outlet gas flow ratio. The gas rich in CH 4 was partially oxidized with oxygen in a high-temperature fixed-bed quartz reactor charged with coke particles of 10 mm size. At 1200–1300 °C, a CH 4 conversion of >99% could be obtained. The H 2 /CO ratio in the synthesis product gas can be adjusted in the range 0.3–1.4, very favorable for further C1 synthesis.
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Shen et al. (2007) studied this question.
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