| 摘要 |
1285599 Separating CNCI from HCl DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 14 Nov 1969 [19 Nov 1968] 55795/69 Heading B1L Cyanogen chloride is recovered from gas streams also containing hydrogen chloride by absorbing the cyanogen chloride in a chlorinated hydrocarbon, in which hydrogen chloride is substantially insoluble. A suitable arrangement is to pass the stream upward in countercurrent to absorbent, whereby the hydrogen chloride may be removed as gaseous overhead; the liquid bottoms containing the absorbed cyanogen chloride is then either fractionally distilled or the absorbent preferentially dissolved in another solvent, e.g. hexachlorobutadiene, which may thereafter be removed by distillation, to yield a gaseous overhead of cyanogen chloride and a liquid bottoms of absorbent, which is then returned to the absorption stage. In examples, the preferred absorbents are 1, 2, 4-trichlorobenzene, tetrachloroethylene and carbon tetrachloride. |
