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Refining method for sodium citrate

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

Inactive Publication Date: 2017-06-13
句容亿格纳米材料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 reused, raw materials will be wasted, a large amount of organic waste liquid will be generated, and the environment will be polluted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of refining method of sodium citrate, the method comprises the steps:

[0017] (1) Dissolve the crude sodium citrate dihydrate under pressure and heating with a small amount of water to obtain an aqueous sodium citrate solution; wherein, the mass ratio of the crude sodium citrate dihydrate to water is 10:1, and the water is deionized Water; pressure is 1MPa, temperature is 60°C;

[0018] (2) Filter with a bag filter under the same pressure and temperature conditions as in step (1), and then slowly decompress and cool to crystallize; the steps of slow decompression are: subtract 0.02MPa per hour;

[0019] (3) After reducing to normal pressure, the solid and liquid are separated to obtain a solid;

[0020] (4) Send the solid matter into a vacuum rotary dryer for drying. The vacuum degree of drying is -0.08MPa, the temperature is 70°C, and the drying time is 6h; the finished product of sodium citrate dihydrate is obtained with a yield of 87.4%.

[00...

Embodiment 2

[0022] Embodiment 2: a kind of refining method of sodium citrate, the method comprises the steps:

[0023] (1) Dissolve the crude sodium citrate dihydrate under pressure and heat with a small amount of water to obtain an aqueous sodium citrate solution; wherein, the mass ratio of the crude sodium citrate dihydrate to water is 12:1, and the water is deionized Water; pressure is 2MPa, temperature is 80°C;

[0024] (2) Under the same pressure and temperature conditions as in step (1), filter with a bag filter, and then slowly decompress and cool to crystallize; the steps of slow decompression are: subtract 0.01MPa per hour;

[0025] (3) After reducing to normal pressure, the solid and liquid are separated to obtain a solid;

[0026] (4) Send the solid matter into a vacuum rotary dryer for drying, the drying vacuum degree is -0.09MPa, the temperature is 50°C, and the drying time is 3h; the finished product of sodium citrate dihydrate is obtained with a yield of 93.2%.

[0027] A...

Embodiment 3

[0028] Embodiment 3: a kind of refining method of sodium citrate, the method comprises the steps:

[0029] (1) Dissolve the crude sodium citrate dihydrate under pressure and heating with a small amount of water to obtain an aqueous sodium citrate solution; wherein, the mass ratio of the crude sodium citrate dihydrate to water is 11:1, and the water is deionized Water; pressure is 1.5MPa, temperature is 70°C;

[0030] (2) Filter with a bag filter under the same pressure and temperature conditions as in step (1), and then slowly decompress and cool to crystallize; the steps of slow decompression are: subtract 0.015MPa per hour;

[0031] (3) After reducing to normal pressure, the solid and liquid are separated to obtain a solid;

[0032] (4) Send the solid matter into a vacuum rotary dryer for drying at a vacuum degree of -0.083MPa, a temperature of 60°C, and a drying time of 5 hours; the finished product of sodium citrate dihydrate is obtained with a yield of 91.8%.

[0033] A...

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Abstract

The invention discloses a refining method for sodium citrate. The method comprises the following steps: (1) pressurizing, heating and dissolving a crude product of sodium citrate dihydrate with a small amount of water to obtain sodium citrate aqueous solution; (2) filtering the sodium citrate aqueous solution under the same pressure condition as that of the step (1), reducing pressure slowly, cooling, and crystallizing; (3) performing solid-liquid separation to obtain a solid; (4) drying the solid in a vacuum rotary dryer to obtain a finished product of the sodium citrate dihydrate. The refining method has the following advantages that a production process is easy to control; the operation process is simple; the sodium citrate prepared by adopting the method is high in purity, high in yield, white in colour and lustre, few in impurities and stable in product quality.

Description

technical field [0001] The invention relates to a method for purifying chemicals, in particular to a method for refining 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 reused, raw materials will be wasted, a large amount of org...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C59/265
CPCC07C51/42C07C59/265
Inventor 潘峥嵘
Owner 句容亿格纳米材料厂
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