Device for continuously rectifying and refining cyanoacetate and technology thereof

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...

AI Technical Summary

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

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