845.    ERDMANN, E.  Production of Methane From Carbon Monoxide and Hydrogen.  Gas World, vol. 55, 1911, pp. 195-197; Jour. Gasbeleucht., vol. 54, 1911, pp. 737-741; Chem. Trade Jour., vol. 49, 1911, p. 175; Chem. Abs., vol. 5, 1911, pp. 3618, 3726.

     Commercial process (the Cedford gas process) is described of converting water gas into CH₄ as follows:  CO+3H₂=CH₄+H₂O.  In practice it is necessary to use 5 vol. H₂ : 1 CO.  A water gas containing 40% CO, 4% CO₂, 52% H₂, and 4% N₂ after going through the process, contained traces of CO and CO₂, 30% CH₄, 62% H₂ and 6-7% N₂.  The total cost was 8.5 d. per 1,000 cu. ft.