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Methyl chloroacetate production method and device

A technology for the production of methyl chloroacetate, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of difficult post-processing rectification, serious discharge of three wastes, secondary pollution, etc., and achieve Avoid alkaline hydrolysis and hydrolysis consumption, protect the environment, reduce consumption and yield

Pending Publication Date: 2017-08-11
漯河豫博生物化工有限公司
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Problems solved by technology

It causes ester, salt, alkali and water paste, which increases the difficulty of separation. The loss of methyl chloroacetate after neutralization in each batch reaches as much as 10-30% (depending on the amount of alkali used). The natural reduction will cause difficulties in post-processing rectification, and cause secondary pollution and serious discharge of three wastes

Method used

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  • Methyl chloroacetate production method and device

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Effect test

Embodiment 1

[0021] Embodiment 1 A kind of production method of methyl chloroacetate comprises the following steps,

[0022] a. Mix chloroacetic acid and methanol according to the molar ratio of 1:1.10-1:1.15 to form a mixed solution;

[0023] b. Evenly drop the mixed solution into the esterification reactor 2, and control the reaction temperature of the esterification reactor 2 to be 105-125°C;

[0024] c. A glass-lined packing tower 3 is arranged at the outlet of the esterification reactor 2, and after the esterification reactor 2 product is cooled, the water layer is separated through the water separation tank 5, and the separated methanol is recovered;

[0025] d. Drain the crude ester layer of the lower layer of the water separation tank 5 to the crude ester storage tank 7, and introduce the crude ester layer of the crude ester storage tank 7 into the rectification kettle 8 for rectification to obtain the finished product methyl chloroacetate.

[0026] In step d, the temperature is c...

Embodiment 2

[0035] Embodiment two A kind of production method of methyl chloroacetate, see figure 1 : including the following steps,

[0036] a. Mix chloroacetic acid and methanol according to the molar ratio of 1:1.10-1:1.15 to form a mixed solution;

[0037] b. Evenly drop the mixed solution into the esterification reactor 2, and control the reaction temperature of the esterification reactor 2 to be 105-125°C;

[0038] c. A glass-lined packing tower 3 is arranged at the outlet of the esterification reactor 2, and after the esterification reactor 2 product is cooled, the water layer is separated through the water separation tank 5, and the separated methanol is recovered;

[0039] d. Drain the crude ester layer of the lower layer of the water separation tank 5 to the crude ester storage tank 7, and introduce the crude ester layer of the crude ester storage tank 7 into the rectification kettle 8 for rectification to obtain the finished product methyl chloroacetate.

[0040] In step d, t...

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Abstract

The invention relates to a methyl chloroacetate production method and device. The methyl chloroacetate production method comprises the following steps that (a) chloroacetic acid and methyl alcohol are mixed according to the mole proportion of 1:1.10 to 1: 1.15 to obtain a mixed solution; (b) the mixed solution is evenly and dropwise added into an esterification reaction kettle, and the reaction temperature of the esterification reaction kettle is controlled to 105-125 DEG C; (c) a glass lining filler tower is arranged at an outlet of the esterification reaction kettle, a product of the esterification reaction kettle is cooled, water layer separation is conducted on a water tank, and separated methyl alcohol is recovered. 99.9% methyl chloroacetate can be continuously and stably produced. By omitting a neutralization process in the scheme, material alkaline hydrolysis and hydrolysis consumption caused by added alkali liquor are avoided, accordingly material consumption and yield improvement are reduced, and the yield can be remarkably improved.

Description

technical field [0001] The invention relates to a chemical product production device, in particular to a production method and equipment for methyl chloroacetate. Background technique [0002] The production of 99.9% methyl chloroacetate is due to the three-way azeotropic gasification process of methanol-water-methyl chloroacetate during esterification, which inevitably carries chloroacetic acid into the next production process. The content of chloroacetic acid in methyl chloroacetate As high as 7-15% (depending on the speed of evaporation, the content of chloroacetic acid varies), resulting in high acidity of the material, and the process of neutralization must be introduced. It causes ester, salt, alkali and water paste, which increases the difficulty of separation. The loss of methyl chloroacetate after neutralization in each batch reaches as much as 10-30% (depending on the amount of alkali used). The natural reduction will cause difficulties in post-processing rectific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/63
CPCC07C67/08C07C67/54C07C69/63
Inventor 孙海燕张爱民
Owner 漯河豫博生物化工有限公司
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