| 摘要 |
1,219,183. Cyanogen chloride. AGRIPAT S.A. 16 Feb., 1968 [17 Feb., 1967], No. 7598/68. Heading C1A. Cyanogen chloride is prepared by passing water downwardly through a packed scrubbing column and then in a falling film through a reactor section and passing gaseous chlorine upwardly through a lower packed stripping section to the falling film reactor section and then through the scrubbing column and flowing gaseous hydrogen cyanide into the column at the upper end of the falling film. The temperature in the falling film section of the column is controlled by extracting a substantial part of the heat of reaction directly from the falling film section of the column. 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 between 10% and 23% 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. |
