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Device for continuously rectifying and refining cyanoacetate and technology thereof

A technology of esterification and cyanoacetic acid, which is applied in the field of continuous rectification and refining of cyanoacetate and equipment for continuous rectification and purification of cyanoacetate, which can solve the problems of low purity, high energy consumption, and high cost of malonate problems, to achieve the effect of easy automatic operation, high yield and large production capacity

Pending Publication Date: 2018-03-23
烟台国邦化工机械科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existence, aiming at the problems of low purity of cyanoacetate and malonate, high energy consumption and high cost, a continuous rectification and refining cyanoacetate device is provided

Method used

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  • Device for continuously rectifying and refining cyanoacetate and technology thereof

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Embodiment Construction

[0030] Such as figure 1 As shown, a continuous rectification and refining cyanoacetic acid esterification device includes a light removal tower 2, a malonate first-stage rectification tower 9, a cyanoacetic acid ester product tower 16, and a malonate The second stage rectification tower 24, the recovery tank 31, and the recovery tank condenser 32; the second stage of the light removal tower 2 is connected to the middle of the first stage rectification tower 9 of the malonate compound, and the top of the light reduction tower 2 is The top condenser 4 and the light removal tower top catcher 5 are connected with a light removal tower top reflux tank 6, and the bottom of the light removal tower top reflux tank 6 is connected to the light removal tower 2 via a light removal tower top reflux pump 7 The top of the tower; the malonate first-stage rectification tower 9 is connected to the middle of the cyanoacetic acid ester product tower 16, and the top of the malonate first-stage rect...

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Abstract

The invention discloses a device for continuously rectifying and refining cyanoacetate and a technology thereof. In the device, the lower middle part of a cyanoacetate product tower is connected to arecycling kettle; the top of the cyanoacetate product tower is connected with a cyanoacetate product tower top reflowing tank through a cyanoacetate product tower top condenser and a cyanoacetate product tower top catcher; the cyanoacetate product tower top reflowing tank is connected with the upper middle part of the cyanoacetate product tower through a cyanoacetate product tower top reflowing pump; the top of a malonate second-grade rectifying tower is connected with a malonate second-grade rectifying tower top reflowing tank through a malonate second-grade rectifying tower top condenser anda malonate second-grade rectifying tower catcher; the malonate second-grade rectifying tower top reflowing tank is connected to the upper middle part of the malonate second-grade rectifying tower through a malonate second-grade rectifying tower top reflowing pump. The device disclosed by the invention has the advantages that a production process is continuously carried out, the utilization rate of equipment is high, the production capability is great, the production efficiency is high and the labor intensity of workers is low.

Description

Technical field [0001] The invention belongs to a synthesis process of a continuous production process, and particularly relates to a device for continuously rectifying and refining cyanoacetic acid ester and using the device for continuously rectifying and refining cyanoacetic acid ester. Of craftsmanship. Background technique [0002] Ethyl cyanoacetate is an important chemical intermediate for the synthesis of esters, amides, acids and nitriles. Japan is mainly used as an intermediate of cyanoacrylate quick-drying glue, used in the bonding of auto parts and household appliances assembly parts, and also used in the fields of vitamin B6, synthetic dyes, etc. Ethyl cyanoacetate, methoxyacetylacetone and ammonia can be cyclized to produce 5-cyano-6-hydroxy-4-methoxymethyl-2-methylpyridine. After nitration, chlorination, and catalytic hydrogenation, 3-amino-5-aminomethyl-4-methoxymethyl-2-methylpyridine can be obtained. After further diazotization, hydrolysis, and salt formation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/34C07C255/19B01D3/00B01D3/14
CPCB01D3/002B01D3/146C07C253/34C07C255/19
Inventor 张燕毛学峰梁晓帅
Owner 烟台国邦化工机械科技有限公司
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