| 摘要 |
PURPOSE:To simplify facilities by lowering the inlet temp. of a catalyst bed, by using a methanizer in which a lower-temperature shift catalyst comprising a Cu/ Zn system is provided in the upstream side and a methanization catalyst is provided in the downstream side in methanizing a gas contg. CO and H2. CONSTITUTION:A methanizer in which a low-temperature shift catalyst 5 comprising a Cu/Zn system is provided in the upstream side and a methanization catalyst 7 such as an Ni or Ru catalyst which is highly active at 250-300 deg.C is provided in the downstream side is used. A mixture consisting of a gas contg. Co and H2 and steam is fed through a line 1 to the methanizer 3 and methanized. Since the shift catalyst 5 which is highly active at a low temp. is provided in the upstream side, the inlet temp. of the catalyst bed is lowered to 180 deg.C. Accordingly, the quantity of the heat of reaction, which can be dealt with for each stage of the reactor, is greatly increased so that the number of the stages of the reactor can be reduced.
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