Preparation of high purity sodium dehydroacetate

A high-purity technology of sodium dehydroacetate, which is applied in the field of preparation of high-purity sodium dehydroacetate, can solve problems such as unstable quality, inferior color, and low purity of sodium dehydroacetate, and achieve white appearance, stable quality, and high purity high effect

Inactive Publication Date: 2009-07-08
NANTONG ALCHEMY BIOTECH DEV
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  • Abstract
  • Description
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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of preparation method of high-purity sodium dehydroacetate, to overcome the deficiencies of the sodium dehydroacetate prepared by the existing method with lower purity, inferior color and unstable quality

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific embodiments.

[0014] A kind of preparation method of high-purity sodium dehydroacetate described in the present embodiment comprises the following steps:

[0015] Reaction: Put distilled water (H 2 (2) 1100kg is put into the reaction kettle, start stirring, open the steam jacket for heating, when the temperature in the pot rises to 45-50°C, close the steam valve, open the dust suction fan, and start to throw 800kg of dehydroacetic acid (DHA), Add 160kg of sodium hydroxide (NaOH) until the feeding is finished. During the feeding, pay attention to the temperature change. Under normal circumstances, after the feeding of NaOH, the temperature in the kettle will rise by 2-3°C; When the temperature in the kettle rises to 77°C, reduce the amount of steam to stabilize the temperature; measure the pH value to reach 9, open the steam valve, raise the temperature to 80°C, and keep it for 10 minute...

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Abstract

The invention provides a method for preparing high-purity sodium dehydroacetate. The method comprises the following steps: reaction, which is to feed 1,100kg of H2O into a reaction kettle, feed 800kg of dehydroacetic acid into the reaction kettle at a temperature of between 45 and 50 DEG C, feed 160kg of sodium hydroxide into the reaction kettle after the reaction is finished, and after compositions feeding is finished, lower steam amount when temperature in the kettle rises to 77 DEG C so as to stabilize the temperature; pH value determination, which is to make the pH value reach 9, open a steam valve, raise the temperature to 80 DEG C for 10 minutes, preserve the temperature for 15 minutes after the pH value is redetermined to 9, and start to add active carbon into the kettle at a temperature of 80 DEG for 1 hour; pressure filtration; crystallization; suction filtration; dehydration; coarse crushing, drying and discharging; and crushing and packaging. The method has the advantages that the high-purity sodium dehydroacetate prepared by the method has white appearance, high purity, and steady quality.

Description

technical field [0001] The invention relates to the field of food additives, in particular to a preparation method of high-purity sodium dehydroacetate. Background technique [0002] Sodium dehydroacetate is a safe food antiseptic, anti-mildew, bactericidal and fresh-keeping agent approved by the Food and Agriculture Organization of the United Nations and the World Health Organization. The existing method of synthesizing sodium dehydroacetate generally is to utilize dehydroacetic acid and sodium hydroxide and / or sodium carbonate as raw material, the raw material is mixed and ground, and directly reacts under solid condition to make, can obtain and be used in chemical grade, Sodium dehydroacetate of pharmaceutical grade or food grade, but the sodium dehydroacetate synthesized by the existing method has low purity, poor color and unstable quality. Contents of the invention [0003] The purpose of this invention is to provide a kind of preparation method of high-purity sodiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D309/32A23L3/3544
Inventor 许卫东顾兵
Owner NANTONG ALCHEMY BIOTECH DEV
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