Method for synthesizing sodium diacetate crystal in one step

A technology of sodium diacetate and a synthesis method is applied in the synthesis of preservatives and the field of preservatives, and can solve the problems of high raw material price, difficult process control, large reaction heat release, etc. simple effect

Inactive Publication Date: 2014-02-12
广饶县多利多新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. Acetic acid-acetic anhydride-soda ash method: the price of raw materials is high, and the process is not easy to control;
[0007] 4. Acetic acid-sodium hydroxide method: the heat of reaction is large, and the production is unsafe. Domestic manufacturers using this method have experienced explosions;
[0008] 5. Acetic acid-soda ash method: product quality is difficult to control, and generally only powdery products can be obtained

Method used

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  • Method for synthesizing sodium diacetate crystal in one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] raw material purity% mass kg % by weight glacial acetic acid 99% 100 70.68 ionic membrane bond 99% 15.5 10.95 Anhydrous Sodium Carbonate 99% 26 18.37

[0021] In the kneader, at room temperature, add ionic membrane and soda ash, start stirring, open the empty tube, add 100kg of glacial acetic acid dropwise in 17 minutes, then automatically heat up to 85°C after 18 minutes, then automatically cool down slowly, and cool down in 15 minutes to 80°C, then cooled to 75°C in 25 minutes, opened the lid of the reactor, and cooled to 50°C after 30 minutes to discharge.

[0022] Product sampling analysis: free acetic acid 39.9%, sodium acetate 58.8%, moisture 1.4%. The product complies with the FAO / WHO standard.

Embodiment 2

[0024] raw material purity% mass kg % by weight glacial acetic acid 99% 78 72.2 ionic membrane bond 99% 12 11.1 Anhydrous Sodium Carbonate 99% 18 16.7

[0025] In the kneader, at room temperature, add ionic membrane and soda ash, start stirring and open the empty tube, add the actual amount of glacial acetic acid in 20 minutes, and react for 10 minutes. After the temperature rises to 85°C, it will automatically and slowly cool down. After 15 minutes of crystallization, the temperature dropped to 80°C, and then dropped to 60°C after 60 minutes to discharge.

[0026] Product sampling analysis: 40.4% free acetic acid, 58.3% sodium acetate, and 1.3% moisture. Meets FAO / WHO standards.

Embodiment 3

[0028] Keeping the ratio of raw materials in Example 1 unchanged, in the kneader at room temperature, add ionic membrane and soda ash, turn on the machine and stir to open the empty tube, add 100 kg of glacial acetic acid dropwise in 10 minutes, and then automatically heat up to 65 °C after 15 minutes , and then automatically and slowly lower the temperature to 60°C in 5 minutes, open the lid of the reactor, and cool to 50°C after 15 minutes to discharge.

[0029] Product sampling analysis: free acetic acid 40.2%, sodium acetate 58.6%, moisture 1.2%. The product complies with the FAO / WHO standard.

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Abstract

The invention relates to a method for synthesizing a preservative and antistaling agent, and in particular relates to a method for synthesizing a sodium diacetate crystal in one step. The following raw materials are adopted in percent by weight: 70.4-72.4% of glacial acetic acid, 10.8-12.0% of ionic membrane method caustic soda flake and 16.5-18.6% of anhydrous sodium carbonate. The synthesis steps are as follows: (1) mixing the ionic membrane method caustic soda flake with the anhydrous sodium carbonate, slowly adding the glacial acetic acid and then naturally heating, controlling total reaction time to be 30-50 minutes, and controlling maximum reaction temperature to be 65-85 DEG C; and (2) cooling the temperature below 50-60 DEG C after the reaction is completed, and discharging. By applying the method provided by the invention, solid-liquid separation equipment, drying equipment and a reaction heating device are eliminated, a sodium diacetate crystal one-step synthesis method is realized, process is simple and safe, energy is saved, production cost can be greatly reduced, yield of the product reaches up to more than 97%, product quality is easy to control, and the standard of FAO / WHO (Food and Agriculture Organization / World Health Organization) is met.

Description

technical field [0001] The present invention relates to a kind of synthetic method of antiseptic, antistaling agent, in particular to a kind of synthetic method of sodium diacetate crystal. Background technique [0002] Sodium diacetate has been widely used in food, feed, and fruit preservation and preservation at home and abroad. It has been approved by the US Food and Drug Administration FDA and registered as a food additive. As early as 1977, the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO) officially approved the use of sodium diacetate preservatives in food and feed. my country has also approved the production and use of this product, and it has been included in the national standard "Classification and Code of Food Additives" in 1990. The classification code of sodium diacetate is: 017, 013". It has been used as food additive and feed additive abroad for more than 50 years. It is a safe, reliable, efficient and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/10C07C51/41
Inventor 刘玉峰王宝辉李长泰陈铭深
Owner 广饶县多利多新型材料有限公司
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