Method for continuously producing benzotriazole

A benzotriazole and production system technology, applied in the chemical industry, can solve problems such as survival difficulties, environmental pollution, and quality assurance, and achieve the effects of ensuring product quality, reducing environmental pollution, and realizing a virtuous circle

Inactive Publication Date: 2015-05-20
GANSU ZHONGHENG NEW MATERIAL TECH
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Problems solved by technology

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

Method used

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  • Method for continuously producing benzotriazole

Examples

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Embodiment 1

[0017] Example 1, see figure 1 , a method for continuous production of benzotriazole, specifically carried out in the following steps:

[0018] Step 1: Put the process water and solid sodium nitrite into the sodium nitrite dissolution kettle 1 according to the mass ratio of 1:0.4~0.7, start stirring, and at the same time, feed 2bar steam into the jacket of the dissolution kettle to raise the temperature, and finally maintain the temperature to 50 ℃~70℃ to completely dissolve the sodium nitrite, and form a sodium nitrite solution in the sodium nitrite dissolving kettle 1;

[0019] Step 2: According to the mass ratio of 0.4-0.6:1, the o-phenylenediamine (OPD) and the sodium nitrite solution formed in step 1 are respectively pumped into the reaction kettle 2 by using a high-pressure metering pump, and the heat transfer oil is turned on to raise the temperature and pressure to make the reaction kettle The pressure is finally kept at 4.5-5.5MPa, and the temperature is finally kept...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D249/18
CPCC07D249/18
Inventor 岳建龙李广
Owner GANSU ZHONGHENG NEW MATERIAL TECH
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