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Method for preparing 2-cyanopyrazine

A technology of cyanopyrazine and methylpyrazine, which is applied in the field of preparing 2-cyanopyrazine, can solve problems such as environmental hazards, and achieve high-quality results

Inactive Publication Date: 2018-09-21
新乡市巨晶化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is not uncommon to prepare 2-cyanopyrazine at this stage, but because ammonia, ethylenediamine and other volatile substances are often used in the process, if they are disposed of randomly, they will cause harm to the environment

Method used

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  • Method for preparing 2-cyanopyrazine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment combines figure 1 with figure 2 Shown, a kind of method for preparing 2-cyanopyrazine, comprises the method for preparing 2-methylpyrazine jointly by propylene glycol and ethylenediamine, and the method for preparing 2-cyanopyrazine by 2-methylpyrazine , the method of co-preparing 2-methylpyrazine by propylene glycol and ethylenediamine is as follows,

[0030] (1.1) Propylene glycol and ethylenediamine are mixed;

[0031] (1.2) Dilute the mixed product by adding water;

[0032] (1.3) Vaporize the diluted mixture;

[0033] (1.4) adding the vaporized mixed gas to the catalyst for reaction;

[0034] (1.5) cooling and filtering the reacted product, and reclaiming the ethylenediamine obtained by filtering;

[0035] (1.6) dehydrating the cooled product, and getting rid of the waste water obtained by dehydration;

[0036] (1.7) Carry out rectification to the product after dehydration, and the rectification residue that rectification obtains is got rid of...

Embodiment 2

[0047] This embodiment is further improved based on embodiment 1, as figure 2 As shown, the excess ammonia in the step (2.2) is absorbed by the tertiary water, and the tertiary water that has absorbed the excess ammonia is added to the step (2.3) to carry out the neutralization reaction.

[0048] During the implementation process, the excess ammonia gas can ensure sufficient reaction, and the excess ammonia gas is absorbed and neutralized by the tertiary water to ensure that the ammonia gas will not be discharged to pollute the environment.

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Abstract

The invention discloses a method, especially a method for preparing 2-cyanopyrazine. The invention involves a method for preparing 2-methylpyrazine through propylene glycol and ethene diamine and a method for preparing 2-cyanopyrazine through 2-methylpyrazine. The method of the invention comprises steps of mixing, dilution, vaporization, reaction, cooling, dehydration, rectification, reaction, cooling absorption, neutralization, extraction and rectification. The whole flow is short and simple. With reuse for many times, emission is reduced as much as possible, and the effect of environmental protection is achieved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing 2-cyanopyrazine. Background technique [0002] 2-cyanopyrazine is an important organic chemical raw material and pharmaceutical intermediate, which is widely used in the fields of spices and medicine. [0003] It is not uncommon to prepare 2-cyanopyrazine at this stage, but since ammonia, ethylenediamine and other volatile substances are often used in the process, if they are disposed of randomly, they will cause harm to the environment. Contents of the invention [0004] The object of the present invention is: the present invention provides a kind of method for preparing 2-cyanopyrazine. [0005] The technical scheme that the present invention adopts is as follows: [0006] A method for preparing 2-cyanopyrazine, comprising the method of preparing 2-methylpyrazine jointly by propylene glycol and ethylenediamine, and the method for preparing 2-cyanopyra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D241/24
CPCC07D241/24
Inventor 许小峰张振亮王照祥
Owner 新乡市巨晶化工有限责任公司