Production method for tripotassium phosphate

Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for tripotassium phosphate. A tripotassium phosphate product is prepared by directly reacting urea phosphate and potassium hydroxide according to a molar ratio of 1: 2.95-3.05 for 30-60 min at a reaction temperature of 40-80 DEG C, with stirring at a stirring speed of 30 r / min. The tripotassium phosphate product is prepared by directly reacting urea phosphate and potassium hydroxide, so that the whole process has no requirements for high energy consumption; raw materials can be obtained relatively easily; a process route is short and simple; and production cost of tripotassium phosphate is reduced. By adjusting the process route and controlling reaction conditions, the produced tripotassium phosphate completely meets a first level standard of industrial tripotassium phosphate.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of tripotassium phosphate. Background technique [0002] Tripotassium phosphate, alias: potassium phosphate, potassium orthophosphate, potassium phosphate trihydrate, potassium phosphate anhydrous; colorless orthorhombic crystal or white crystalline powder; tripotassium phosphate is mainly used in boiler water treatment in industry to manufacture liquid Soap, high-quality paper, refined gasoline, synthetic rubber, can also be used as a buffer, emulsifier, chelating agent, flavoring agent, yeast food, antioxidant synergist, meat binder, etc. in the food industry, widely used in agriculture It is used for the production of high-efficiency liquid compound fertilizer. At present, the preparation method for tripotassium phosphate mainly contains thermal method phosphoric acid method, and thermal method phosphoric acid method is divided into neutralizatio...

AI Technical Summary

Problems solved by technology

At present, the preparation method for tripotassium phosphate mainly contains thermal method phosphoric acid method, and thermal method phosphoric acid method is divided into neutralization method and potassium carbonate method again, and neutralization method is to adopt thermal method phosphoric acid and potassium hydroxide reaction to prepare tripotassium phosphate, Although this method obtains product quality higher, its production energy consumption is bigger, and cost is higher; Another kind of method is potassium carbonate method, and this method is to adopt thermal method phosphoric acid to react with potassium carbonate earlier, generates dipotassium hydrogen phosphate, phosphoric acid Continue to neutralize the dipotassium hydrogen solution with potassium hydroxide to generate tripotassium phosphate, centrifuge, and dry to obtain the product. This method consumes a lot of potassium carbonate, requires strict process conditions, and is difficult to guarantee product quality. It also consumes a lot of energy and costs a lot.

[0003] For example, the patent No.: 200510048775.7 "A Preparation Method of Potassium Tripolyphosphate" uses superphosphoric acid and anhydrous potassium carbonate high-temperature solid-state reaction to synthesize tripotassium phosphate in one step, and then undergoes neutralization, drying, crushing, roasting, crushing and other processes Obtained products, it can be seen that the process is long, complicated, high energy consumption, high cost of raw materials, heavy pollution, not conducive to environmental protection and does not have better economic benefits

[0004] Another example is the patent No.: 200910193400.8 "A Preparation Method of Electronic Grade High Purity Potassium Pyrophosphate", mix potassium hydroxide solution and phosphoric acid solution, heat to 85-100°C, react under stirring conditions, adjust the pH value to 8 -12, to obtain a slurry with a slurry concentration of 47-50; the mass ratio of the potassium hydroxide in the potassium hydroxide solution and the phosphoric acid in the phosphoric acid solution is 1:1; the slurry is decolorized after high-temperature concentration, and is separated Purification, continue to concentrate and crystallize the separated and purified product, and dry to obtain dipotassium hydrogen phosphate; react dipotassium hydrogen phosphate at a high temperature of 300-600°C to obtain potassium phosphate product, although the recovery rate of this method is high and pollution-free However, the high-temperature treatment is carried out many times in the whole production process of this method, which consumes a lot of energy, and the process is complicated, and the product production cycle is long

[0005] Another example is the "Preparation Method of High Viscosity Potassium Metaphosphate" whose patent number is 201310566409.5. Potassium dihydrogen phosphate is used as a raw material, which is generated by heating and dehydration polymerization, and the molar ratio of potassium and phosphorus between the potassium-containing raw material and the phosphorus-containing raw material in the raw material is controlled. , the control temperature is a high temperature environment of 550-600 °C to obtain the final high-viscosity potassium phosphate product; Harsh conditions make the cost of raw materials higher, resulting in higher production costs of potassium phosphate products

[0006] This shows that in the prior art, the ubiquitous energy consumption in the tripotassium phosphate production process is bigger, raw material cost is higher, and the technical problem that production cost is bigger

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