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Preparation method of 2-methylimidazole

A technology of methylimidazole and methanol, which is applied in the field of preparation of 2-methylimidazole, can solve the problems of low production efficiency and poor product quality, and achieve the effects of reliable product performance, low cost, low toxicity and pollution

Inactive Publication Date: 2018-11-13
南京雪郎化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention discloses a preparation method of 2-methylimidazole to solve the problems of low production efficiency and poor product quality in the prior art

Method used

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  • Preparation method of 2-methylimidazole

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown a kind of preparation method of 2-methylimidazole, comprises the steps:

[0021] (1) Configure the mother liquor, add nitric acid and acetaldehyde into the reaction kettle at a uniform speed, and then stir and mix the nitric acid and acetaldehyde, and keep the temperature of the reaction kettle at a constant speed of 30°C within 3 minutes during the stirring process, and keep it warm for 1 minute , add the catalyst to the reactor, and keep the stirring state constant for 10 minutes, then add methanol dropwise to the reactor at a constant speed, and complete the methanol drop within 30 seconds. After the methanol drop is completed, the reactor Insulate for 0.5 hours, then leave the mixed solution in the reactor and cool naturally to normal temperature to obtain the mother liquor and set aside;

[0022] (2) Synthesis reaction: Add the ammonium nitrate solution to the reactor within 10 minutes, then stir in one direction at a constant speed for 15 m...

Embodiment 2

[0030] Such as figure 1 Shown a kind of preparation method of 2-methylimidazole, it is characterized in that, it comprises the steps:

[0031] (1) Configure the mother liquor, add nitric acid and acetaldehyde into the reaction kettle at a uniform speed, and then stir and mix the nitric acid and acetaldehyde, and keep the temperature of the reaction kettle at a constant speed of 45°C within 5 minutes during the stirring process, and keep it warm for 3 minutes In the process, add the catalyst to the reaction kettle, keep the stirring state constant for 60 minutes, then add methanol dropwise to the reaction kettle at a constant speed, and complete the methanol dropwise addition within 150 seconds. After the methanol dropwise addition, the reaction kettle Insulate for 2 hours, then let the mixed solution in the reactor stand and cool naturally to normal temperature to obtain the mother liquor and set aside;

[0032] (2) Synthesis reaction: Add the ammonium nitrate solution to the...

Embodiment 3

[0040] Such as figure 1 Shown a kind of preparation method of 2-methylimidazole, comprises the steps:

[0041] (1) Configure the mother liquor, add nitric acid and acetaldehyde into the reaction kettle at a constant speed, and then stir and mix the nitric acid and acetaldehyde, and during the stirring process, the temperature of the reaction kettle is kept at a constant speed of 40°C within 4 minutes and kept for 2 minutes , add the catalyst to the reactor, and keep the stirring state constant for 30 minutes, then add methanol dropwise to the reactor at a constant speed, and complete the methanol drop within 100 seconds. After the methanol drop is completed, the reactor Insulate for 1.5 hours, then let the mixed solution in the reactor stand and cool naturally to normal temperature to obtain the mother liquor and set aside;

[0042] (2) Synthesis reaction: Add the ammonium nitrate solution to the reactor within 12 minutes, then stir in one direction at a constant speed for 45...

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Abstract

The invention discloses a preparation method of 2-methylimidazole. The preparation method comprises three steps of mother liquor preparation, a synthetic reaction and purification and the like. A synthetic process is simple and standardized, a production technology and a production flow are easy to master, and a prepared product is reliable in performance and good in stability. The summary and accumulation of production experiences are convenient, and production raw materials and production processes are simple at the same time. The toxicity and pollution are small in the raw materials and theproduction processes, the cost is low, and the method is helpful to improve the production efficiency and the product quality of a 2-methylimidazole product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of 2-methylimidazole. Background technique [0002] 2-Methylimidazole is widely used in chemical industry, biomedicine and other fields, and its usage is huge and widely used. However, in the actual production and preparation process of 2-Methylimidazole products, the current production and preparation processes are relatively On the one hand, the current production process of 2-methylimidazole products is relatively insufficient, and the production technology experience cannot be effectively exchanged; on the other hand, it also causes the product quality of 2-methylimidazole products produced by different processes , production efficiency and production cost are very different, resulting in relatively poor quality stability of 2-methylimidazole products currently on the market, and relatively chaotic pricing. In view of this situation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58
CPCC07D233/58
Inventor 李云政张磊
Owner 南京雪郎化工科技有限公司
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