Process for producing monopotassium phosphate by taking potassium nitrate as raw material

A technology of potassium dihydrogen phosphate and ammonium dihydrogen phosphate, which is applied in the fields of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as difficult removal of chloride ions, and achieve the effects of reducing production costs and avoiding seedling burning

Inactive Publication Date: 2021-04-23
SICHUAN LOMON PHOSPHORUS CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Through this method to prepare potassium dihydrogen phosphate, a large amount of chloride ions will be introduced into the potassium dihydrogen phosphate product, which is difficult to remove, and chloride ions have a great negative impact in downstream use
Industrial-grade potassium dihydrogen phosphate requires that the chloride ion content be less than 0.05%; in agricultural use, sulfur-based water-soluble fertilizers require chloride ions not to exceed 3%, and the use of potassium chloride and ammonium dihydrogen phosphate to prepare potassium dihydrogen phosphate cannot meet the requirements

Method used

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  • Process for producing monopotassium phosphate by taking potassium nitrate as raw material
  • Process for producing monopotassium phosphate by taking potassium nitrate as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The production steps of potassium dihydrogen phosphate are:

[0050] a. in the reactor, be that the ammonium nitrate of 1.2:1 is mixed with potassium chloride by mol ratio, metathesis reaction takes place and obtains potassium nitrate and ammonium chloride mixture;

[0051] B. cooling and crystallizing the reaction mixture of step a, filtering to obtain potassium nitrate solid and ammonium chloride solution;

[0052] c. the potassium nitrate solid obtained in the step b is washed and recrystallized to obtain the potassium nitrate product;

[0053] d. the potassium nitrate product that dissolving step c obtains obtains density and is 1.2g / cm 3 Potassium nitrate solution, add ammonium dihydrogen phosphate to the potassium nitrate solution and stir, concentrate until the slurry density is 1.4g / cm 3 ;

[0054] e. The solution after the reaction in step c is cooled and then centrifugally filtered to obtain potassium dihydrogen phosphate crystals.

Embodiment 2

[0056] Compared with embodiment 1, the difference of the production step of potassium dihydrogen phosphate only is:

[0057] In step a, the molar ratio of ammonium nitrate to potassium chloride is 1.1:1.

Embodiment 3

[0059] Compared with embodiment 1, the difference of the production step of potassium dihydrogen phosphate only is:

[0060] In step d, the density of potassium nitrate solution is 1.25g / cm 3 .

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Abstract

The invention provides a process for producing monopotassium phosphate by taking potassium nitrate as a raw material. The process comprises the following steps: S1, carrying out double decomposition reaction on ammonium nitrate and potassium chloride to prepare potassium nitrate and ammonium chloride; and S2, reacting the potassium nitrate obtained in the step S1 with ammonium dihydrogen phosphate to prepare potassium dihydrogen phosphate. According to the process, the content of chloride ions in the monopotassium phosphate product can be reduced, and the production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of potassium dihydrogen phosphate preparation, in particular to a process for producing potassium dihydrogen phosphate using potassium nitrate as a raw material. Background technique [0002] Potassium dihydrogen phosphate (MKP) is a high-concentration, water-soluble, chlorine-free high-efficiency phosphorus and potassium compound fertilizer. It has the functions of increasing production and income, preventing insects and diseases, and resisting premature aging. The problem of malnutrition caused by insufficient absorption capacity. Widely used in seed coating, foliar spraying, topdressing, etc. Potassium dihydrogen phosphate is one of the waste materials with the most demand in the modern facility agricultural production market. At the same time, potassium dihydrogen phosphate, as an inorganic phosphate, is the product with the largest market scale among potassium phosphates. [0003] There are more than ...

Claims

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Application Information

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IPC IPC(8): C01B25/30
CPCC01B25/30C01P2006/80C01P2006/82
Inventor 曹宇杨静张晖
Owner SICHUAN LOMON PHOSPHORUS CHEM
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