Method for preparing monopotassium phosphate with co-production of potassium-ammonium dihydrogen phosphate

A technology of ammonium potassium dihydrogen phosphate and potassium dihydrogen phosphate is applied in the field of phosphorus chemical industry, and achieves the effects of good economic benefit, avoiding mother liquor treatment process and strong cost advantage

Inactive Publication Date: 2018-06-05
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the production of potassium dihydrogen phosphate at present, and provide a process for preparing potassium dihydrogen phosphate with cheap raw materials, and at the same time, carry out low-cost treatment of the mother liquor after crystallization, so as to achieve optimal economic benefits

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  • Method for preparing monopotassium phosphate with co-production of potassium-ammonium dihydrogen phosphate

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Effect test

Embodiment 1

[0027] Embodiment 1: a kind of method for preparing potassium dihydrogen phosphate co-production potassium dihydrogen phosphate ammonium comprises the following steps:

[0028] a. Mix wet-process phosphoric acid and potassium sulfate according to the molar ratio of 2.4:1, heat and stir to completely dissolve the solid;

[0029] b. Add water to calcium carbonate to make a slurry and add it to the solution obtained in step a. The amount added is based on the molar ratio of calcium carbonate and potassium sulfate 1.05:1. Cake I;

[0030] c. Add potassium hydroxide solution to the filtrate I obtained in step b to adjust the pH to 4.5, then add ammonium fluorosilicate according to 1.1 times the magnesium ion content in the solution, stir at 60° C. for 1 hour, and then age for 8 hours;

[0031] d. Filtrate the fully aged material in step c to obtain filtrate II and filter cake II; the filtrate II is concentrated, crystallized and dried to obtain potassium dihydrogen phosphate produ...

Embodiment 2

[0035] Embodiment 2: A kind of method for preparing potassium dihydrogen phosphate co-production potassium dihydrogen phosphate ammonium comprises the following steps;

[0036] a. Mix wet-process phosphoric acid and potassium sulfate according to the molar ratio of 2.2:1, heat and stir to completely dissolve the solid;

[0037] b. Add water to calcium carbonate to make a slurry and add it to the solution obtained in step a. The amount added is calculated according to the molar ratio of calcium carbonate and potassium sulfate 1.1:1. Maintain the temperature at 80°C, stir for 4 hours and then filter. Cake I;

[0038] c. Add potassium hydroxide solution to the filtrate I obtained in step b to adjust the pH to 4.5, then add ammonium fluorosilicate according to 1.1 times the magnesium ion content in the solution, stir at 40°C for 1 hour, and then age for 10 hours;

[0039] d. Filtrate the fully aged material in step c to obtain filtrate II and filter cake II; the filtrate II is co...

Embodiment 3

[0042] Embodiment 3: A kind of method for preparing potassium dihydrogen phosphate co-production potassium dihydrogen phosphate ammonium comprises the following steps;

[0043] a. Mix wet-process phosphoric acid and potassium sulfate according to the molar ratio of 2.2:1, heat and stir to completely dissolve the solid;

[0044] b. Add water to calcium carbonate to make a slurry and add it to the solution obtained in step a. The amount added is calculated according to the molar ratio of calcium carbonate and potassium sulfate 1.1:1. Maintain the temperature at 80°C, stir for 4 hours and then filter. Cake I;

[0045] c. Add potassium hydroxide solution to the filtrate I obtained in step b to adjust the pH to 4.7, then add ammonium fluorosilicate according to 1.1 times the magnesium ion content in the solution, stir at 70°C for 1 hour, and then age for 14 hours;

[0046] d. Filtrate the fully aged material in step c to obtain filtrate II and filter cake II; the filtrate II is co...

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Abstract

The invention discloses a method for preparing monopotassium phosphate with co-production of potassium-ammonium dihydrogen phosphate. The method comprises the following steps: (1) mixing and dissolving wet-method phosphoric acid and potassium sulfate according to a ratio, adding calcium carbonate to react completely, and filtering; (2) adjusting the pH value of filtrate with a potassium hydroxidesolution, sufficiently aging, filtering, concentrating and crystallizing filtrate so as to obtain a monopotassium phosphate product; and (3) neutralizing crystallized mother liquor with ammonia water,enabling the components to react sufficiently, filtering, and concentrating and crystallizing filtrate, thereby obtaining potassium-ammonium dihydrogen phosphate. As the wet-method phosphoric acid and the potassium sulfate are adopted as raw materials directly, the production cost is low; and as the ammonia water is introduced to convert the crystallized mother liquor into potassium-ammonium dihydrogen phosphate, tedious mother liquor decontamination procedures are avoided, and very good economic benefits can be achieved.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry, and in particular relates to a method for preparing potassium dihydrogen phosphate and co-producing ammonium sulfate by a circulation method. Background technique [0002] Potassium dihydrogen phosphate is widely used in medicine, food, industry, agriculture and other fields. In medicine, it can be used as acidifying agent and nutritional agent, and it is an important raw material for fermentation in the production of antibiotics; in food, it can be used as leavening agent, flavoring agent, fermentation agent, nutrition enhancer, etc.; in industry, it is mainly used for bacterial culture and buffer solution preparation , is also a raw material for other phosphate preparations; in agriculture, potassium dihydrogen phosphate is a high-concentration, high-efficiency phosphorus-potassium compound fertilizer, which is widely used for soaking seeds, watering and foliar spraying, and can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01B25/45C05B7/00
CPCC01B25/301C01B25/451C01P2006/80C01P2006/82C05B7/00
Inventor 张小元肖林波窦德军金艳锋廖秋实
Owner HUBEI SANNING CHEM
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