433. COOPER, C., HENSHAW, D. M., AND W. C. Holmes & Co., LTD. Purification of Gases Containing Hydrogen Sulfide. British Patent 551,652, Mar. 4, 1943. Chem. Abs., vol. 38, 1944. p. 3114.

Patent Abstracts

Describes process for treating coal gas and other gases containing H₂S with a dilute solution of NH₄OH. The times of contact of the gases with the liquid is so short that H₂S is selectively absorbed.