2041.     LAIDLER, D. S., AND TAYLOR, J.  Study of the Carburization Process With Special Reference to Gas Carburizing.  Reduction of the Carbon Dioxide Content of Town Gas.  Jour. Iron Steel Inst. (London), vol. 165, 1950, pp. 23-39; Chem. Abs., vol. 44, 1950, p. 9890.

        Carburization process with town gas as the carburizing medium has been developed.  In purified town gas or in CO, all the atomic C formed at the surface is absorbed into the steel.  The rate of diffusion of C in the steel and the rate of graphite formation are the rate-controlling reactions.  With town gas containing O₂, moisture, and CO₂ there are 3 important differences:  Soot forms at the surface at the expense of atomic C.  The soot so deposited restricts further carburization.  Formation of graphite from atomic C is rapid and is no longer the rate-controlling reaction.  In a gas containing 2.6% CO₂, 0.8% O₂, 2.6% C_n H_m, 24.7% CH₄, 48.3% H₂, and 12.3% N₂, the O₂ and CO₂ contents are decreased by passing the gas over a baryta catalyst.  16 refs.

        LAIDLER, K. J.  See abs. 3180.

        LAMBERT, G. I.   See abs. 3591.