“…Water washing of acid gas from desulfurizers dates back to the late 1940's when Koppers recovered sodium cyanide from the Vacuum Carbonate plant at its Kearny, N. J. works. 6 Bethlehem Steel also has employed acid gas water washing techniques, removing cyanide to prevent contamination of contact sulfuric acid plants. 3 In the current version of the process, wash water is chilled (tõ 18°C), brought into contact with acid gas, stripped of absorbed HCN and H 2 S (using COG, BFG, or a mixture of the two) and recycled.…”