Method for preparing potassium sorbate with membrane chemical reactor

Abstract

The invention discloses a method for preparing potassium sorbate with a membrane chemical reactor. The method comprises the following steps: 1, weighting potassium hydroxide (KOH) and potassium sorbate according to a mass ratio of 1:1-1.5:1 at 50-90DEG C, alternately adding them to the membrane chemical reactor with water in batches until the pH value of the formed reaction solution reaches 7.0-9.5; 2, keeping the temperature of the reaction solution at 65-85DEG C for 30-40min after finishing the material addition, and controlling the pH value of the reaction solution at 7.0-9.5; and 3, sequentially carrying out press filtration, crystallization, dehydration, drying, granulation and redrying after finishing the reaction in the membrane chemical reactor to obtain potassium sorbate particles. The method for preparing the potassium sorbate particles with the membrane chemical reactor has the advantages of simple technology, and good parallel reaction selectivity and security; and prepared potassium sorbate has the advantages of white appearance, purity of more than 99.5 WT%, and stable quality.

Description

technical field [0001] The invention relates to a method for producing potassium sorbate, in particular to a method for producing potassium sorbate with a membrane chemical reactor. Background technique [0002] Potassium sorbate is a common low-alcohol and high-efficiency food preservative, which has a good inhibitory effect on mold, yeast and aerobic fungi, and is widely used in jam, fruit juice, candied fruit, soy sauce and other foods. At present, the equipment for large-scale production of potassium sorbate at home and abroad is a general enamel reaction kettle, and the process of its mature process is roughly as follows, that is: take sorbic acid and potassium carbonate or potassium hydroxide for neutralization reaction, and then concentrate, cool, crystallize, Filtration, drying, packaging and other processes to obtain finished products, however, because each reactant is added at one time during the reaction process, the reaction concentration is not easy to control, ...

AI Technical Summary

Problems solved by technology

At present, the equipment for large-scale production of potassium sorbate at home and abroad is a general enamel reaction kettle, and the process of its mature process is roughly as follows, that is: take sorbic acid and potassium carbonate or potassium hydroxide for neutralization reaction, and then concentrate, cool, crystallize, Filtration, drying, packaging and other processes to obtain finished products, however, because each reactant is added at one time during the reaction process, the reaction concentration is not easy to control, side reactions are likely to occur, the yield of finished products is not high, the purity is also affected, and the appearance is inferior

Therefore, the existing technology and equipment for this production of potassium sorbate need to be improved