IMPROVEMENTS IN OR RELATING TO THE PRODUCTION OF CYANOGEN CHLORIDE

摘要

1,222,442. Cyanogen chloride. AGRIPAT S.A. 16 Feb., 1968 [17 Feb., 1967], No. 7596/68. Heading C1A. Cyanogen chloride is prepared by flowing water downwardly through a packed scrubbing column and then into a reaction column flooded with an aqueous reaction medium and passing gaseous chlorine upwardly through the aqueous reaction medium and flowing gaseous hydrogen cyanide into the aqueous medium between the ends of the flooded reactor. The temperature in the reactor column is controlled by extracting a substantial part of the heat of reaction directly from the reactor. The relative proportions of water, chlorine and hydrogen cyanide are adjusted so as to produce hydrochloric acid at the bottom of the column at a concentration of from 13 to 26% by weight. Gaseous cyanogen chloride flows up through the scrubber and is washed by the downflowing water. The hydrochloric acid is saturated with chlorine and cyanogen chloride which may be stripped from the acid to improve the efficiency of the process. The hydrochloric acid formed is sufficiently concentrated to be a useful by-product.