Sodium Diacetate production method

Abstract

The invention relates to method to produce sodium diacetate by acetic acid and soda, which comprises: with one-step synthesis method, adding soda slowly into stirring acetic acid and additive in reaction process; with normal-pressure inverse flow reaction mean, obtaining the objective product. In this method, the reaction material can contact sufficiently to form even solution system, changes slabby state of materials, reduces reaction temperature below 110Deg to decrease acetic acid volatilization and energy consumption, increases yield to more than 95%, and fit to industrial production in large scale.

Description

technical field [0001] The present invention relates to the preparation method of sodium diacetate, be specifically related to a kind of method that adopts acetic acid and sodium carbonate to produce sodium diacetate as raw material. Background technique [0002] Sodium diacetate is a new type of green food, feed and grain antiseptic and antifungal agent. Its production process includes two main processes of chemical synthesis and crystal formation. The chemical synthesis reaction is to neutralize acetic acid (or acetic anhydride) and sodium acetate (or sodium carbonate, sodium hydroxide) at a certain temperature to obtain acetic acid and acetic acid Molecular associations of sodium; the crystal formation process is to make the molecular associations form crystals and precipitate during the cooling process. At present, the production methods of sodium diacetate mainly contain the following five kinds according to different raw materials: 1. The acetic acid-sodium acetate me...

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Problems solved by technology

2. Acetic anhydride-sodium acetate method, although the yield of this method is high, but the price of acetic anhydride is high, and the reaction time is long, which makes the product cost of this method high

[0003] 3. The acetic acid-acetic anhydride-sodium carbonate method does not require heating during production, and the product particle size is small and uniform, but the reaction time is as long as 10 hours, the power consumption is large, the yield is only 80%, and acetic anhydride is expensive

4. The acetic acid-caustic soda method has low cost of raw materials, but the reaction time is long and the quality of impurities is difficult to guarantee

5. The acetic acid-sodium carbonate method is divided into three methods: ethanol as solvent, water as solvent and no solvent. In recent years, this method is mostly used in industrial production. The raw materials of this method are easy to obtain, low in cost and simple in process, but There are defects such as poor material fluidity, affecting operation, and unstable product quality. Chinese patent CN1369472 discloses the acetic acid-sodium carbonate method without using any solvent. This method is synthesized in one step. Although the production process steps are relatively short, when the reaction reaches a certain stage The reactant becomes viscous, it is difficult to continue, the reaction liquid is difficult to form a uniform system, the reaction is incomplete, and the reaction temperature is high, exceeding the boiling point of acetic acid (118 ° C), the amount of vaporization is large, it is difficult to condense, the loss is large, and the yield is low