Working up of the residual gases resulting from the production of cyanuric chloride

DETAILED DESCRIPTION What is claimed is: 1.
A process for working up the chlorine containing residual gases obtained in the production of cyanuric chloride by the trimerization of cyanogen chloride and consisting chiefly of unreacted cyanogen chloride, as well as chlorine, hydrogen chloride and inert gases comprising leading them into the lower portion of a column at 1-5 bar (absolute), reacting the gases in the column with at least the equivalent amount of hydrogen cyanide to form cyanogen chloride, charging water into the upper portion of the column, leading the cyanogen chloride formed in countercurrent flow to said water, and withdrawing an aqueous solution of cyanogen chloride from the lower portion of the column and removing the purified waste gas from the upper portion of the column.
2.
The process of claim 1 wherein the lower portion of the column is at 1-4 bar.
3.
The process of claim 2 wherein the cyanogen chloride solution withdrawn from the column is returned to the production portion of a plant for recovery of the cyanogen chloride.
4.
The process of claim 2 wherein the temperature is 10.
degree.
-60.
degree.
C.
5.
The process of claim 2 wherein the hydrogen cyanide added is part of a solution circulating in the portion of a plant producing cyanogen chloride.
6.
The process of claim 1 wherein the hydrogen cyanide added is part of a solution circulating in the portion of a plant producing cyanogen chloride.
7.
The process of claim 1 wherein the temperature is 0.
degree.
-100.
degree.
C.
8.
The process of claim 7 wherein the temperature is 10.
degree.
-60.
degree.
C.




Description:
BACKGROUND OF THE INVENTION It is known to produce cyanogen chloride (see Huemer German Pat.
No.
827,358, Huemer German Pat.
No.
842,067 and Ullmann's Encyclop/a/ die der technischen Chemie, 3rd edition, Vol.
5 (1954) page 624) by reacting hydrogen cyanide and chlorine in the presence of water to form cyanogen chloride and hydrochloric acid to drive off the cyanogen chloride from the aqueous solution by heating, to dry over calcium chloride and to trimerize to cyanuric chloride in a subsequent reactor at 200