349. CEDFORD GAS PROCESS CO., LTD. [Methane From Carbon Monoxide and Hydrogen.} German Patent 237,499, July 20, 1910. Chem. Abs., vol. 6, 1912, p. 1669.

Patent Abstracts

In the catalytic manufacture of CH₄ from commercial gas, which after separation from the CO₂, is condensed to separate the impurities, the cooling is carried to such an extent that the condensed impurities solidify and, consequently, have little or no expansibility.

See abs. 165, 166.