Method for continuously producing benzotriazole

Abstract

The invention relates to a method for continuously producing benzotriazole. The method is characterized by being realized through a continuous production system and comprises the following specific steps: putting process water and solid sodium nitrite according to a mass ration of (0.4-0.6): 1 into a dissolving kettle to form a sodium nitrite solution; respectively pumping o-phenylenediamine and the sodium nitrite solution into a reactor for reacting; feeding a reaction product inside a protective reactor, fully reacting and feeding into an acidifying kettle, feeding gas generated in the acidification process in an alkaline washing tower, and separating the acidified reaction liquid to form a crude product benzotriazole and wastewater; feeding the crude product benzotriazole into a water washing kettle, and bagging and recovering solid sodium sulfate; feeding into the water washing kettle, layering the solution and dehydrating the lower layer material. By the method, the productivity is improved, the energy consumption of a product is decreased and the environmental pollution is effectively reduced; enterprises obtain considerable benefits so that the virtuous circulation is achieved.

Description

technical field

[0001] The invention belongs to the field of chemical industry and relates to a method for continuously producing benzotriazole (BTA). Background technique

[0002] At present, when using the existing process system to produce benzotriazole, both the reaction part and the rectification part adopt batch operation, which not only leads to uneven product quality, but also cannot guarantee the quality. Moreover, it causes low production capacity, high energy consumption, serious environmental pollution, and poor safety. Therefore, enterprises are often small in scale, have small profits, have great pressure on environmental protection, and find it difficult to survive. Contents of the invention

[0003] In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to provide a process system capable of continuously producing benzotriazole, which ensures product quality, reduces energy consumption and environmental p...

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