Environment-friendly and clean method for continuous cyaniding synthesis of sodium cyanoacetate and derivatives thereof

A technology for synthesizing sodium cyanoacetate and sodium cyanoacetate, which is applied in the preparation of organic compounds, cyanide reaction preparation, chemical instruments and methods, etc., to achieve the effects of increasing cyanide yield, saving production costs, and increasing product yield

Inactive Publication Date: 2018-01-16
熊知平
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Problems solved by technology

Invention Application Publication CN02442926 A proposes "a continuous cyanation method for sodium chloroacetate" although it can basically solve the problems of overheating and leaking, but the automatic control of production, energy saving and water saving, low-carbon environmental protection, clean production, and reaction conversion rate There is still a lot of room for technical improvement

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  • Environment-friendly and clean method for continuous cyaniding synthesis of sodium cyanoacetate and derivatives thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: 30.5% sodium chloroacetate aqueous solution with the speed of 100kg / min and 30.0% sodium cyanide aqueous solution with the speed of 44.9kg / min respectively with liquid metering continuous feeding pump from the head end of static mixer Injection, the sodium chloroacetate solution is preheated to 50°C through a heat exchanger before entering the mixer, the preheated sodium chloroacetate solution and the normal temperature sodium cyanide solution are fully mixed in the mixer and then flow into the column reactor, the mixed solution The temperature at the bottom of the column reactor is 68°C, the cyanation reaction material continuously enters and rises and undergoes rapid cyanation reaction. The temperature in the middle of the column reactor is 110°C, and the upper temperature of the column reactor is 115°C. The material reacts completely in the column reactor and flows out from the upper outlet; the retention time of the cyanide reaction material in the colu...

Embodiment 2

[0032]Example 2: 30.5% aqueous sodium chloroacetate solution at a rate of 200 kg / min and a 30.0% aqueous sodium cyanide solution at a rate of 89.8 kg / min were continuously fed from the head end of the static mixer with a liquid metering continuous feed pump. Injection, the sodium chloroacetate solution is preheated to 48 ℃ through the heat exchanger before entering the mixer, the preheated sodium chloroacetate solution and the normal temperature sodium cyanide solution are fully mixed in the mixer and then flow into the column reactor, the mixed solution The temperature at the bottom of the column reactor is 67°C, the cyanation reaction material continuously enters and rises and reacts rapidly, the temperature in the middle of the column reactor is 109°C, and the upper temperature of the column reactor is 115°C, and the cyanation reaction The material reacted completely in the column reactor and flowed out from the upper outlet; the retention time of the cyanation reaction mate...

Embodiment 3

[0035] Example 3: The 30.5% aqueous sodium chloroacetate solution was continuously fed from the head end of the static mixer at a rate of 150 kg / min and a 30.0% aqueous solution of sodium cyanide at a rate of 67.3 kg / min, respectively, with a liquid metering continuous feed pump. Injection, the sodium chloroacetate solution is preheated to 49 ℃ through the heat exchanger before entering the mixer, the preheated sodium chloroacetate solution and the normal temperature sodium cyanide solution are fully mixed in the mixer and then flow into the column reactor, the mixed solution The temperature at the bottom of the column reactor is 68°C, the cyanation reaction material continuously enters and rises and reacts rapidly, the temperature in the middle of the column reactor is 110°C, and the temperature at the upper part of the column reactor is 115°C, and the cyanation reaction The material reacted completely in the column reactor and flowed out from the upper outlet; the retention t...

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Abstract

The invention provides an environment-friendly and clean method for continuous cyaniding synthesis of sodium cyanoacetate and derivatives thereof. Mainly, a continuous cyaniding reaction device is employed to produce sodium cyanoacetate and derivatives thereof, the cyaniding reaction environment can approach an ideal state and the reaction conversion rate can approach a theoretical value maximumly, thus realizing environment-friendly, clean and safe production. A cyanided material flows out from a column reactor, then directly enters a flash evaporator for flash separation and cooling, thus obtaining a sodium cyanoacetate solution, the sodium cyanoacetate solution can be used for production of derivatives including cyanoacetic acid, methyl cyanoacetate, ethyl cyanoacetate, malonic acid, methyl malonate, ethyl malonate, propyl malonate and the like. And the flash tail gas can be recycled.

Description

technical field [0001] An environmentally friendly and clean process method for continuous cyanation to synthesize sodium cyanoacetate and its derivatives is to provide an environmentally friendly and clean process for continuously cyanating sodium chloroacetate and sodium cyanide to synthesize sodium cyanoacetate and its derivatives; A continuous cyanation reaction device realizes continuous cyanation and provides guarantee for the realization of environmental protection, clean and safe production, and belongs to a new type of low-carbon environmental protection industry environmental protection and clean production process method. Background technique [0002] Cyanide reaction is an important reaction step in organic synthesis, especially the cyanide reaction between organic salts such as sodium chloroacetate and its derivatives and sodium cyanide, which involves the synthesis of many pharmaceutical and pesticide intermediates and a huge industrial chain The production of ...

Claims

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Application Information

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IPC IPC(8): C07C253/14C07C253/30C07C255/19C07C51/08C07C51/09C07C55/08C07C67/08C07C69/38
Inventor 李宽义龙智熊知平李紫郡
Owner 熊知平
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