Method for producing acidic potassium dihydrogen phosphate

A technology of acid potassium dihydrogen phosphate and phosphoric acid, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of high cost and low purity of acid potassium dihydrogen phosphate, and reduce cooling The effect of water consumption, high purity and high product yield

Active Publication Date: 2019-03-08
CHANHEN ECO TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is that the cost of producing acid potassium dihydrogen phosphate in the prior art is high and the purity is low

Method used

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  • Method for producing acidic potassium dihydrogen phosphate
  • Method for producing acidic potassium dihydrogen phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0050] First, take P 2 o 5 Add 1500g of purified phosphoric acid with a concentration of 42% into a 2000ml beaker and stir, press H 3 PO 4 : KCl molar ratio 2.1:1 calculation adding K 2 325g of industrial potassium chloride with an O content of 61.04% is mixed in a beaker; secondly, the dechlorination reaction is carried out by heating in an electric furnace, and the temperature of the slurry reaches 198° C. The slurry is moved to a beaker containing 1265g process water for hydrolysis, and the slurry density after hydrolysis is 1498Kg / m 3 ; The 4th, hydrolysis slurry continues cooling, crystallization, uses Buchner funnel to filter when temperature drops to 28 ℃, obtains crystalline product;figure 1 As shown, the finished product inspection data are shown in Table 1, wherein the pH value uses a pH meter to detect 4‰ of the finished product aqueous solution. The G4 crucible of the water-insoluble product in this embodiment is detected at 0.09%-0.3%, and the water-insoluble ...

Embodiment 2

[0054] First, take P 2 o 5 Add 1500g of industrial phosphoric acid with a concentration of 54.4% into a 2000ml beaker and stir, press H 3 PO 4 : KCl molar ratio of 1.9:1 calculated by adding K 2 466g of industrial potassium chloride with an O content of 61.04% is mixed in a beaker; second, the electric furnace is heated to carry out dechlorination reaction, and the slurry temperature reaches 229 ° C. The reaction ends, and the process control pressure is 99.6KPa; the third, the dechlorination slurry Move to the beaker that contains 1563g process water and carry out hydrolysis, the slurry density after hydrolysis is 1598Kg / m 3 Fourth, the hydrolyzed slurry continues to cool and crystallize, and when the temperature drops to 47°C, use a Buchner funnel to filter to obtain a crystallized product; fifth, the product is dried in a vacuum oven to obtain 816g of finished product, and the test data of the finished product are shown in the table below, wherein The PH value uses a pH...

Embodiment 3

[0058] according to figure 2 The process shown in the scale-up test, first, use our company's P 2 o 5 120Kg of purified phosphoric acid with a concentration of 24.3%, press H 3 PO 4 : KCl molar ratio 2:1 calculation adding K 2 15.9Kg of industrial potassium chloride with an O content of 60.7% is mixed in a mixing tank; secondly, the slurry is transferred to a reactor and heated with heat conduction oil for dechlorination reaction, first controlling the reaction pressure to 60KPa, and then gradually increasing the pressure to 101.5 KPa, the temperature of the slurry reaches 160℃~190℃ to stop the reaction; thirdly, move the dechlorinated slurry to the hydrolysis tank for hydrolysis, add process water, and control the density of the slurry after hydrolysis to 1500Kg / m 3 ~1600Kg / m 3 ; Fourth, the slurry continues to cool and crystallize, and when the temperature drops to 40°C to 45°C, use a centrifuge to filter the crystallized product, and collect the centrifuged mother liq...

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Abstract

The invention provides a method for producing acidic potassium dihydrogen phosphate and belongs to the technical field of production of phosphate in the inorganic chemical industry, aiming at solvingthe technical problems in the prior art that the cost for producing the acidic potassium dihydrogen phosphate is high and the purity is low. The method for producing the acidic potassium dihydrogen phosphate, disclosed by the invention, comprises the following steps: a, mixing materials; b, carrying out dechlorination reaction; c, hydrolyzing slurry; d, crystallizing, separating and drying, wherein the dechlorination reaction is to carry out heating dechlorination in a sealed reaction kettle; then process water is added to carry out hydrolysis. The acidic potassium dihydrogen phosphate prepared by the method has the advantages that the chlorine content is 0.09 to 0.31%, the purity is high, the appearance looks like white sugar and the water solubility is good; the utilization requirementsof high-end water-soluble fertilizer are met.

Description

technical field [0001] The invention belongs to the technical field of phosphate production in the inorganic chemical industry, and in particular relates to a method for producing acid potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate acid, also known as half potassium in the market, its molecular formula is KH 2 PO4·H 3 PO 4 . Because of its strong acidity, the pH value of the 4 / 1000 aqueous solution is about 2.3, and its water solubility is very good, so it is mainly used as a raw material for acidic water-soluble fertilizer or directly as an acidic water-soluble fertilizer. Acid potassium dihydrogen phosphate is a new type of fertilizer, and there are very few literatures reporting acid potassium dihydrogen phosphate. [0003] Chinese patent document CN104555964A discloses a production method of acid potassium dihydrogen phosphate. The patent involves two process routes, one uses phosphoric acid and potassium dihydrogen phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B7/00C05B17/00
CPCC05B7/00C05B17/00
Inventor 黄强王佳才吴生平李顺方毛诚
Owner CHANHEN ECO TECH CO LTD
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