Cyanogen chloride preparation process for cyanate ester resin synthesis

Abstract

The invention discloses a cyanogen chloride preparation process for cyanate ester resin synthesis. According to the process, a reactor is used in a cyanogen chloride preparation process, and comprisesa base, a reaction bin is arranged on the upper surface of the base, a discharging port is formed in the bottom end of the reaction bin, a material collecting port is formed in the top end of the reaction bin, and a first material storage bin, a condensation bin, a first material receiving bin, a second material storage bin and a second material receiving groove are further fixed to the upper surface of the base; a sodium cyanide aqueous solution in the first storage bin is pressed into a liquid spraying pipe from a liquid conveying vertical pipe through a booster pump and is sprayed out by liquid spraying heads, and the liquid spraying heads are arranged in a crossed manner, so that the sodium cyanide aqueous solution is completely atomized, and the whole reactor is filled with the sodium cyanide aqueous solution; gas spraying pipes are located on the upper side and the lower side of the liquid spraying pipe, so that chlorine can make full contact with the sodium cyanide aqueous solution when entering the reactor; and by arranging a discharge port valve and a first liquid guide valve, the unreacted sodium cyanide aqueous solution enters the reaction bin again, so that the sodiumcyanide aqueous solution and the chlorine react sufficiently.

Description

technical field [0001] The invention belongs to the technical field of cyanate resin synthesis, and in particular relates to a preparation process of cyanogen chloride used for the synthesis of cyanate resin. Background technique [0002] The chlorination process of cyanate resin is the reaction of sodium cyanide aqueous solution and chlorine gas to generate cyanogen chloride intermediates. The reaction is violent and rapid, with large heat release and strong corrosion. It has certain advantages in high temperature resistance and corrosion resistance, but the reactor has the following more prominent defects. [0003] 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] It cannot be processed to the precision that the raw materials are fully c...

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Problems solved by technology

[0003] 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] It cannot be processed to the precision that the raw materials can be fully contacted and reacted. The mixing effect of sodium cyanide solution and chlorine gas inside the reactor is poor, and the 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

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