Solvent-free heating-free method for synthesizing potassium diformate

Abstract

A non-solvent and non-heating method for synthesizing potassium diformate relates to a compound preparation method, which is a one-step potassium diformate synthesis method that takes potassium hydroxide and formic acid as raw materials and requires no solvent and no heating. A normal atmospheric pressure refluxing reaction method is adopted, and the solid potassium hydroxide is added into the formic acid by a molar ratio of 1:2.0-3.0 between the solid potassium hydroxide and the formic acid; the reaction temperature is kept between 50-90 DEG C when the materials are added; the reaction continues when the materials adding stops and is not stopped until the temperature falls to 20-50 DEG C; the reaction product is cooled and crystallized at room temperature, and the crystallized product is dried at a temperature of 50-60 DEG C and finely grinded, then the potassium diformate is acquired. No heating is required in the reaction, thereby the reaction intensity is well controlled while the reaction heat is fully utilized; the product is synthesized without solvent, thereby saving the evaporating and concentrating processes, shortening the production period and improving the production efficiency; the yield of the potassium diformate is as high as 99 percent or over. The method is suitable for large scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a method for synthesizing potassium diformate by using potassium hydroxide and formic acid as raw materials. Background technique [0002] Potassium diformate is a new type of feed additive used as an alternative to antibiotic growth promoters. It is the first new green feed additive approved by the European Union in 2001 to replace antibiotic growth promoters, and the Ministry of Agriculture of China also approved its promotion and use in feed in 2005. Studies have shown that potassium diformate is added to the feed as an acidifier, which can effectively inhibit harmful bacteria, improve the microbial flora in animals, and enhance the immune function of animals; improve enzyme activity and nutrient digestibility; improve the palatability of feed, effectively Improve animal daily gain, feed conversion rate, and reduce disease. The European Union has completely banned the us...

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Problems solved by technology

[0004] The U.S. invention patent US6137005 discloses a process for preparing potassium diformate by the reaction of formic acid and potassium formate. This method can obtain potassium diformate with a higher yield, but the price of potassium formate, one of the raw materials used, is high, which increases the cost of the method. production cost

Chinese patent CN1428325A discloses a method of directly reacting potassium carbonate or potassium hydroxide with formic acid in a special reactor to prepare potassium diformate. Bottom feeding not only increases energy consumption, but also is not conducive to the control of reaction intensity

Chinese patent CN1704394A discloses a process for preparing potassium diformate by reacting formic acid aqueous solution with potassium carbonate or potassium hydroxide aqueous solution. The disadvantages of this process are large water consumption, evaporation and concentration, high energy consumption, and increased production cost.

Chinese patent CN1844074A also discloses a preparation method of potassium diformate. Potassium diformate is obtained by the reaction of formic acid aqueous solution and solid potassium oxide. This method has simple process, less water consumption, and reduces energy consumption, but there is also the price of raw material potassium oxide. high problem

However, the reaction time of this process is long and the process is complicated, which requires additional separation steps of the process product methanol, which greatly increases equipment investment and energy consumption.

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