The preparation of potassium cinnamate specifically comprises the following steps:
S1, select cinnamic acid, potassium hydroxide, activated carbon and auxiliary materials as preparation raw materials;
S2, the cinnamic acid is pulverized by a pulverizer, and then the pulverized cinnamic acid is ground by a pulverizer, and the particle size of the grinding particles is 10um;
S3, the activated carbon is pulverized by a pulverizer, and then the pulverized activated carbon is ground by a grinder, and the particle size of the grinding particle is 20um;
S4, the cinnamic acid powder and activated carbon powder obtained in S2 and S3 are washed by deionized water, then filtered, and then dried;
S5, dissolve food grade potassium hydroxide in distilled water to obtain potassium hydroxide solution, and the concentration of potassium hydroxide solution is 2mol/L;
S6, adding potassium hydroxide solution and activated carbon powder into the reactor, stirring and mixing, the stirring time is 10min, and the stirring temperature is 50～60 ℃, then add the cinnamic acid powder into the reactor, continue to stir, and the stirring time is 30min, stirring temperature is 120～140 ℃, then add auxiliary materials into the reaction kettle, continue stirring, make the pH value of the mixed solution 9;
S7, the mixed solution in the above-mentioned reaction kettle is taken out, left standstill for 10min at normal temperature, the activated carbon powder in the mixed solution is filtered out, then the mixed solution is subjected to crystallization centrifugal treatment, and the obtained solid crystal is dried under vacuum to obtain cinnamon Potassium acid finished product.