Refine method of sodium citrate mother solution

A sodium citrate solution and sodium citrate technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as burden, heavy company, and restriction of citric acid development, so as to increase yield and reduce production cost Effect

Active Publication Date: 2012-08-01
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disposing of these wet gypsums not only creates a heavy burden on the company, but also pollutes the environment.
Moreover, the production process of sodium citrate by calcium salt neutralization method is complicated, the yield is low, the energy consumption and material consumption are large, and a large amount of difficult-to-treat waste water and waste residue are produced. These shortcomings have seriously restricted the development of my country's citric acid industry.
And adopt ion exchange method, because the adsorption amount to citric acid is too small, citric acid is easy to charcoal too high, yield is low, finally makes production cost high

Method used

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  • Refine method of sodium citrate mother solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1) Preparation of modified anion exchange resin

[0060] At 30°C, 500mL of hydrochloric acid with a concentration of 4% by weight was passed into 800mL of SQD815 macroporous weakly basic acrylic anion exchange resin (Jiangsu Suqing Water Treatment Engineering Group Co., Ltd., with an exchange capacity of 5.0 mmol OH - / gram dry resin) column, and soak resin 2h, then, use 1500mL deionized water to rinse ion-exchange column, obtain modified anion-exchange resin. OH per gram of the modified anion exchange dry resin - The molar weight is 4.55 millimoles, every gram of Cl in this modified anion exchange dry resin - The molar amount is 0.45 mmol, the functional group Cl in the modified anion exchange resin - with functional group OH -The molar ratio of is 1: 10.1, with the total molar weight of the functional group of modified anion exchange resin as benchmark, the functional group Cl in this modified anion exchange resin - The content is 9 mol%.

[0061] 2) Preparation ...

Embodiment 2

[0072] 1) Preparation of modified anion exchange resin

[0073] At 40°C, 300mL of hydrochloric acid with a concentration of 4% by weight was passed through 800mL of SQD816 macroporous weakly basic acrylic anion exchange resin (Jiangsu Suqing Water Treatment Group Co., Ltd., with an exchange capacity of 7.5 mmol OH - / gram dry resin) column, and soak resin 2h, then, use 1500mL deionized water to rinse ion-exchange column, obtain modified anion-exchange resin. OH per gram of the modified anion exchange dry resin - The molar weight is 7.03 millimoles, every gram of Cl in this modified anion exchange dry resin - The molar amount is 0.47 mmol, the functional group Cl in the modified anion exchange resin - with functional group OH - The molar ratio of is 1: 15, is based on the total molar weight of the functional group of modified anion exchange resin, the functional group Cl in this modified anion exchange resin - The content is 6.3 mol%.

[0074] 2) Preparation of sodium citr...

Embodiment 3

[0079] 1) Preparation of modified anion exchange resin

[0080] 780 mL of HZ819 macroporous weakly basic acrylic anion exchange resin (purchased from Shanghai Huazhen Technology Co., Ltd., with an exchange capacity of 6.3 mmol OH - / gram dry resin) and 425mL concentration are 4% by weight hydrochloric acid at 30 ℃ and mix 2h, then, the resin in the anion exchange resin after contacting is taken out, dries with centrifuge, obtains modified anion exchange resin. OH per gram of the modified anion exchange dry resin - The molar weight is 5.8 millimoles, every gram of Cl in this modified anion exchange dry resin - The molar weight is 0.48 mmol, the functional group Cl in the modified anion exchange resin - with functional group OH - The molar ratio of is 1: 12, is based on the total molar weight of the functional group of modified anion exchange resin, the functional group Cl in this modified anion exchange resin - The content is 7.6 mol%.

[0081] 2) Preparation of sodium cit...

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Abstract

The invention discloses a refine method of a sodium citrate mother solution. The refine method includes mixing the sodium citrate mother solution and a citric acid clear solution to obtain a mixture; contacting the obtained mixture with a modified anion exchange resin, and enabling a citrate ion to be absorbed to the modified anion exchange resin; and performing elution by means of a sodium hydroxide aqueous solution to obtain a sodium citrate solution. Functional groups of the modified anion exchange resin contain OH- and Cl-, the mole ratio between the functional group OH- and the functional group Cl- in the modified anion exchange resin is 1:(5-20), and based on the integral molar quantity of the functional groups of the modified anion exchange resin, the content of the functional group Cl- in the modified anion exchange resin is 4.7mole%- 16.7mole%. The refine method is capable of effectively improving the yield of sodium citrate so as to reduce the preparation cost of the sodium citrate.

Description

technical field [0001] The invention relates to a method for refining sodium citrate mother liquor. Background technique [0002] Sodium citrate is currently the most important citrate in industry, and it has a wide range of uses, and can be used in food, medicine, environmental protection, electroplating and brewing industries. For example, it is widely used as a seasoning and stabilizer in food processing, as a buffer and side complexing agent in the non-toxic electroplating industry, and as an anticoagulant, expectorant and diuretic in the pharmaceutical industry. [0003] At present, the production process of sodium citrate mainly includes traditional calcium salt neutralization method, ion exchange method and so on. The calcium salt neutralization method to treat sodium citrate mother liquor not only consumes a large amount of hydrochloric acid, sulfuric acid, and calcium carbonate, but also emits a large amount of CO 2 and gypsum and other wastes. Disposing of these...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/47
Inventor 满云卢宗梅胡富贵王浩吴师
Owner COFCO BIOTECHNOLOGY CO LTD
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