Preparation of ammonium potassium dihydrogen phosphate

A technology of potassium ammonium dihydrogen phosphate and potassium hydrogen sulfate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of inability to popularize potassium ammonium dihydrogen phosphate on a large scale, high production cost, complicated process, and the like, Achieve the effect of reducing equipment investment and energy consumption, low production cost and high concentration

Active Publication Date: 2009-01-21
昆明隆祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, only Israel has produced potassium ammonium dihydrogen phosphate with better quality by using the solvent extraction purification method, but its production cost is high, the process is complicated, and the productivity is low.
There are also domestic enterprises trying to pro

Method used

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  • Preparation of ammonium potassium dihydrogen phosphate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A, the concentration is 97.5% sulfuric acid and K 2 Potassium chloride with an O content of 59.8%, by H 2 SO 4 : After the mol ratio of KCl=3.5: 1 mixes, react at 110 ℃ of temperature for 60 minutes, obtain the mixed solution of potassium bisulfate and sulfuric acid, and the hydrogen chloride gas that reaction produces sends hydrochloric acid operation production hydrochloric acid;

[0024] B. Add phosphoric acid back into the phosphoric acid extraction tank of the common sulfuric acid wet phosphoric acid process in advance, and the P in the phosphoric acid back 2 o 5 Not less than 15%, K 2 Under the condition that O is not less than 4%, the mixed solution obtained in step A and the phosphate rock powder crossing 100 mesh sieves are added respectively in the phosphoric acid extraction tank by the mass ratio of mixed solution: phosphate rock powder=0.8:1, and The liquid-solid ratio of the slurry is 2.8:1, and the liquid phase SO 3 The concentration is 30-50 g / L, the...

Embodiment 2

[0033] A, the concentration is 97.5% sulfuric acid and K 2 O content is the agricultural grade potassium sulfate of 49.41%, after mixing by sulfuric acid: the mol ratio of potassium sulfate=5.4:1, obtains the mixed solution of potassium bisulfate and sulfuric acid;

[0034] B. Add phosphoric acid back into the phosphoric acid extraction tank of the common sulfuric acid wet phosphoric acid process in advance, and the P in the phosphoric acid back 2 o 5 Not less than 15%, K 2 Under the condition that O is not less than 4%, the mixed solution obtained in step A and the phosphate rock powder crossing 100 mesh sieves are added respectively in the phosphoric acid extraction tank by the mass ratio of mixed solution: phosphate rock powder=0.9:1, and The liquid-solid ratio of the slurry is 2.6:1, and the liquid phase SO 3 The concentration is 30-50 g / L, the reaction temperature is 75°C, and the reaction is carried out for 6 hours; the slurry after the reaction is filtered, the filtr...

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Abstract

The invention provides a method for preparing potassium dihydrogen phosphate. In the method, phosphate ores, sulphuric acid and potassium chloride are taken as base materials and subjected to phosphoric acid extraction, filtering, neutralization and separation, concentration and crystallization to obtain a full water-soluble potassium dihydrogen phosphate product, and the potassium dihydrogen phosphate solution prepared is high in concentration, the solid content reaches 40 percent, thereby reducing the load of the concentration process; in particular, the method adopts a process of neutralization first and concentration second, so that the corrosivity of concentration liquids is small, the boiling point is low, and the conventional multi-effect concentration by evaporation can be performed by the common equipment, and the equipment investment and the energy consumption are greatly lowered; because in the phosphoric acid extraction process, the potassium bisulfate is added, thereby effectively lowering the emission of fluorine-containing exhaust gases and facilitating the environmental protection; adding with the development and the utilization of potassium-containing phosphogypsum, the method of the invention can avoid the environmental pollution caused by the phosphogypsum, improve the material utilization ratio and make the material utilization ratio reach 100 percent.

Description

technical field [0001] The invention relates to a preparation method of ammonium potassium dihydrogen phosphate, which belongs to the technical field of chemical industry. Background technique [0002] Ammonium potassium dihydrogen phosphate is a composite crystal composed of potassium dihydrogen phosphate and ammonium dihydrogen phosphate in different proportions, and its molecular formula is KH 2 PO 4 ·NH 4 h 2 PO 4 . Like potassium dihydrogen phosphate, ammonium potassium dihydrogen phosphate also has the advantages of full water solubility and low salt index. In addition, because it also contains nitrogen, it is a fully water-soluble high-concentration ternary compound fertilizer, and its fertilizer effect is better than potassium dihydrogen phosphate. It is a very promising new compound fertilizer. [0003] American Pennzoil Company successfully developed ammonium potassium dihydrogen phosphate as early as the end of the 1970s. However, the company failed to sol...

Claims

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Application Information

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IPC IPC(8): C01B25/45
Inventor 马健李庆
Owner 昆明隆祥化工有限公司
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