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A kind of sodium acetate production process

A production process, sodium acetate technology, applied in carboxylate preparation, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of freezing or crystallization blocking the gas outlet, reduced efficiency, poor effect, etc., to achieve easy Automatic operation and control, good cooling efficiency, and simple crystallization process

Active Publication Date: 2019-12-10
台山市新宁制药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of using convection between gas and liquid to reduce the temperature of the liquid is relatively inefficient, and the effect is very poor. It needs to continuously feed a lot of gas, and the corresponding efficiency is also reduced a lot.
The solution is to introduce lower temperature gas to enhance its cooling efficiency, but the lower temperature gas is easy to freeze or crystallize in the contact part with the concentrated liquid to block the gas outlet

Method used

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  • A kind of sodium acetate production process
  • A kind of sodium acetate production process
  • A kind of sodium acetate production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Put glacial acetic acid and sodium hydroxide solution with a mass fraction of 32% into the reaction kettle with a mass ratio of 1:1, raise the temperature in the kettle to 85 degrees, and keep the temperature constant for reaction; check the pH of the solution at any time, When the reaction reaches a pH value equal to 7.5, add a heavy metal ion precipitant and activated carbon in sequence, decolorize and filter, and retain the filtrate; the heavy metal ion precipitant can be selected from sodium sulfide or a commercially available heavy metal ion precipitant. The filtrate is concentrated by evaporation until the concentration of the sodium acetate solution is 30Bé to obtain a concentrated solution, and then the concentrated solution is passed into the crystallization device of the present invention, and the crystallization device is then cooled to crystallize, so that the temperature in the crystallization device is reduced to 45 degrees; The feed liquid is centrifuged a...

Embodiment 2

[0049] Put glacial acetic acid and sodium hydroxide solution with a mass fraction of 32%-35% into the reaction kettle at a material ratio of 1.05:1, raise the temperature in the kettle to 88 degrees, and keep the temperature constant for reaction; detect the solution at any time When reacting to a pH value equal to 8.0, add heavy metal ion precipitant and active carbon respectively in sequence, decolorize and filter, and retain filtrate; heavy metal ion precipitant can be selected from sodium sulfide or commercially available heavy metal ion precipitant. The filtrate is concentrated by evaporation until the concentration of the sodium acetate solution is 28Bé to obtain a concentrated solution, and then the concentrated solution is passed into the crystallization device of the present invention, and the crystallization device is then cooled to crystallize, so that the temperature in the crystallization device is reduced to 42 degrees; The feed liquid is centrifuged and dried to ...

Embodiment 3

[0055] Put glacial acetic acid and sodium hydroxide solution with a mass fraction of 35% into the reaction kettle with a mass ratio of 1.08:1, raise the temperature in the kettle to 90 degrees, and keep the temperature constant for reaction; check the pH of the solution at any time, When the reaction reaches a pH value equal to 8.3, add a heavy metal ion precipitant and activated carbon in sequence, decolorize and filter, and retain the filtrate; the heavy metal ion precipitant can be selected from sodium sulfide or a commercially available heavy metal ion precipitant. The filtrate is concentrated by evaporation until the concentration of the sodium acetate solution is 26Bé to obtain a concentrated solution, and then the concentrated solution is passed into the crystallization device of the present invention, and the crystallization device is then cooled to crystallize, so that the temperature in the crystallization device is reduced to 40 degrees; The feed liquid is centrifuge...

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Abstract

The invention relates to a sodium acetate production technology. The sodium acetate production technology comprises the following steps: synthesizing, purifying, filtering, concentrating, crystallizing, centrifuging and spin-drying, checking, and packaging. A crystallizing device of the sodium acetate production technology is different from a current jacket-type indirect contact cooling device. Acold gas in a lower temperature is used to be fed into concentrated liquid for cooling, diffusion of the cold gas and the liquid is rapid, and contact is uniform, so cooling efficiency is better. Through installing multiple cold gas pipelines, a heater and an air pressure sensor, a problem of blocking and coagulating an air outlet can be rapidly detected and solved, so a crystallizing flow is simpler, and easy to automatically operate and control. An obtained sodium acetate trihydrate product is higher in purity, and reaches a detecting requirement.

Description

technical field [0001] The invention belongs to the technical field of sodium acetate production, in particular to a sodium acetate production process. Background technique [0002] Medicinal sodium acetate is sodium acetate trihydrate, chemical formula CH 3 COONa·3H 2 O, molecular weight 136.06, white or colorless transparent crystal. Sodium acetate trihydrate is a good heat storage substance with a melting point of 58.4°C and a heat of fusion of 264kJ / kg. Sodium acetate trihydrate is easily soluble in water and slightly soluble in ethanol. It is generally obtained through the neutralization reaction of glacial acetic acid and soda ash or liquid caustic soda, and then obtained by removing impurities, filtering, and concentrating and crystallizing. Generally, its synthesis method is to use glacial acetic acid to react with sodium hydroxide or sodium carbonate, sodium bicarbonate, and then go through impurity removal, evaporation concentration, and crystallization. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/10C07C51/41C07C51/43B01D9/02
Inventor 叶宏裕陈灿雄邝丽琴马景荣
Owner 台山市新宁制药有限公司
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