Refining method of sodium citrate

A technology of sodium citrate and refining method, applied in the direction of separation/purification of carboxylic acid compounds, can solve the problems of product quality discount, product color yellow, a large amount of organic waste liquid, etc., and achieve stable product quality, white color and waste. The effect of low liquid volume

CN107673966AInactive Publication Date: 2018-02-09黄康
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-02-09
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a method for refining sodium citrate. The method comprises the following steps: (1) dissolving the crude product of sodium citrate dihydrate under pressure and heating with a small amount of water to obtain an aqueous solution of sodium citrate; Step (1) Filtrate under the same pressure conditions, slowly decompress and cool and crystallize; (3) Separation of solid and liquid to obtain a solid; (4) Send the solid to a vacuum rotary dryer for drying to obtain citric acid dihydrate Sodium finished product. The invention has the following advantages: the production process is easy to control, the operation flow is simple, the sodium citrate prepared by the method has high purity, high yield, white color, less impurities and stable product quality.
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Description

technical field

[0001] The invention relates to the technical field of chemical purification. More specifically, the present invention relates to a kind of refining method of sodium citrate. Background technique

[0002] Sodium citrate dihydrate is in the form of white powder. It is used as a food additive, complexing agent and buffer in the electroplating industry, used in the pharmaceutical industry to manufacture anticoagulant drugs, and used as a detergent additive in light industry. It is stable at room temperature and air, slightly soluble in humid air, and weathers in hot air. It loses water of crystallization when heated to 150°C. In order to obtain high-purity sodium citrate, the common practice is to dissolve, filter, decolorize, concentrate at normal temperature and pressure, crystallize, and dry; A large amount of mother liquor is produced. If the mother liquor is reused, it will cause further yellowing of the finished product. If the mother liquor is not reus...

Examples

Embodiment 1

[0015] A method for refining sodium citrate, the method may further comprise the steps:

[0016] (1) Pour the crude product of sodium citrate dihydrate into water, stir and dissolve at 5MPa, 60°C to obtain an aqueous solution of sodium citrate;

[0017] (2) Filtrate under the same pressure conditions as step (1), slowly decompress and cool to crystallize;

[0018] (3) solid-liquid separation to obtain a solid;

[0019] (4) The solid matter is sent into a vacuum rotary dryer for drying to obtain the finished product of sodium citrate dihydrate

[0020] The mass ratio of the crude sodium citrate dihydrate to water is 10-12:1.

[0021] The water is deionized water.