Cyanogen chloride preparation method

Abstract

The invention discloses a cyanogen chloride preparation method, which comprises: 1, mixing sodium cyanide and water according to a certain ratio, and uniformly stirring to prepare a 30% sodium cyanidesolution; 2, respectively spraying the 30% sodium cyanide solution obtained in the step 1 and liquid chlorine into a tubular reactor at a certain feeding speed, wherein the gas outlet of the tubularreactor is connected with a condenser; 3, introducing the mixed gas obtained from the gas outlet of the condenser in the step 2 into a desorption tower, and carrying out desorption treatment; and 4, feeding the gas desorbed in the step 3 into a rectifying tower, and purifying. According to the invention, the mixing effect of the 30% sodium cyanide solution and the liquid chlorine in the tubular reactor is good, and the desorbed material liquid is rectified, so that the purity of cyanogen chloride is improved, and the content of the obtained cyanogen chloride can reach more than 97%.

Description

technical field [0001] The invention relates to the technical field of synthesis of organic polymer materials, in particular to a preparation method of cyanogen chloride. Background technique [0002] Cyanogen chloride is an important chemical intermediate, which was mostly used in the production of terpolymers in the past. With the advancement of technology, it is more applied to the cyanidation reaction in the production of fine chemicals, pharmaceutical intermediates, and pesticide intermediates, which puts forward higher requirements for the content of cyanogen chloride, free chlorine, and moisture content. Traditional The preparation method has the following disadvantages: [0003] (1) The heat transfer performance is poor, and the reaction heat cannot be exchanged and taken away in time, resulting in the black color of the wastewater produced by the reaction, which brings great difficulty to the later wastewater treatment and is not environmentally friendly. [0004]...

AI Technical Summary

Problems solved by technology

[0003] (1) The heat transfer performance is poor, and the reaction heat cannot be exchanged and taken away in time, resulting in the black color of the wastewater generated by the reaction, which brings great difficulty to the later wastewater treatment and is not environmentally friendly.

[0004] (2) Can't be processed to the precision that makes raw material fully contact reaction, sodium cyanide solution and chlorine are mixed in reactor interior poorly, and yield is only 60~70%

Residual unreacted chlorine will adversely affect the quality of cyanogen chloride intermediates, and the residual unreacted sodium cyanide solution will be discharged into the wastewater treatment process. The treatment of high-concentration cyanide wastewater is difficult and costly, and its toxicity is not conducive to active bacteria. growing, treating waste water