Method for preparing potassium sorbate through sorbic acid neutralizing

Abstract

The invention belongs to the field of chemical industry production, and specifically provides a method for preparing potassium sorbate through sorbic acid neutralizing. The process comprises: adding sorbic acid and non-ionized water to a reaction kettle, starting stirring, heating to a temperature of 40-60 DEG C, atomizing 40-50% potassium hydroxide at the top portion of the reactor, carrying outa neutralizing on the atomized potassium hydroxide and the sorbic acid, controlling the PH value at 10.0-12.0, adding active carbon, carrying out stirring decolorization for 30 min at a temperature of40-60 DEG C, re-measuring the PH value, micro-adjusting the PH value if the PH value is not 10.0-12.0, filtering the neutralizing liquid, and carrying out spray drying to obtain the finished productpotassium sorbate. According to the present invention, in the process, the potassium hydroxide is atomized to achieve the nanometer scale, and the nano-scale potassium hydroxide and the sorbic acid are subjected to a neutralizing reaction, such that the sorbic acid and the potassium hydroxide contact uniformly, the neutralizing process is mild, and the condition that the influence of the sorbic acid oxidation caused by the local reaction superheating on the quality of the potassium sorbate can be avoided.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a method for preparing potassium sorbate by neutralizing sorbic acid. Background technique [0002] Potassium sorbate, English name: Potassium sorbate, potassium hexadiene-(2,4)-acid, molecular formula and molecular weight, C6H7KO2=150.22, physical and chemical properties: hygroscopic, easily soluble in water and ethanol. Appearance is white to light yellow scale-like crystals, crystalline powder or granular, odorless or slightly smelly, melting point: 270°C (decomposition); relative density: 1.363. [0003] Potassium sorbate is white to light yellow scale-like crystals, crystalline particles or crystalline powder, odorless or slightly odorous, it is easy to absorb moisture when exposed to the air for a long time, and is oxidized and decomposed to change color. Potassium sorbate is easily soluble in water, 67.6g / 100ml (20°C); 5% salt water, 47.5g / 100ml (room temper...

AI Technical Summary

Problems solved by technology

[0006] At present, potassium sorbate manufacturers at home and abroad use sorbic acid and potassium hydroxide to directly drop or feed into the liquid distributor for neutralization reaction, and then dry to obtain the finished product of potassium sorbate. Sorbic acid exists in the process of dropping neutralization The local reaction is severe, leading to local overheating and the oxidation of the double bond of sorbic acid, resulting in a decrease in the overall quality of the finished potassium sorbate product, such as light transmittance.