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Production method of dipotassium phosphate

A technology of dipotassium hydrogen phosphate and its production method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of no economic effect and environmental protection value, large energy consumption, serious pollution, etc., and achieve optimal economy Benefits and environmental protection value, reduction of water consumption and energy consumption, and the effect of reducing production costs

Inactive Publication Date: 2014-08-27
GUIYANG KAILIN FERTILIZER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that in the prior art, in the preparation process of dipotassium hydrogen phosphate, phosphoric acid is used to react with potassium hydroxide or potassium carbonate to produce products. In this process, due to the corrosion of phosphoric acid on equipment, the material requirements for equipment are relatively strict, and at the same time , a large amount of water will be needed in the production process, and the use of high-temperature concentrated products requires a large amount of energy, which makes the production process of the entire dipotassium hydrogen phosphate product costly and seriously polluted, and does not have better economic effects and environmental protection. value

Method used

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Embodiment 1

[0054] A production method of dipotassium hydrogen phosphate, specifically comprising the following steps:

[0055] (1) Preparation of urea phosphate solution: put urea phosphate solid in a dissolving tank, add a certain amount of water into the dissolving tank, stir at a constant speed of 30r / min to obtain a urea phosphate solution, and heat to 45°C;

[0056] (2) Synthesis by adding potassium hydroxide: transport the heated urea phosphate solution to the reaction tank with a delivery pump, and transfer the metered potassium hydroxide solid to Add it into the reaction tank, stir at a stirring speed of 50 r / min at the same time, control the reaction temperature at 50°C, react for 20 minutes, and control the pH value at the end point to 8.2 to obtain dipotassium hydrogen phosphate slurry;

[0057] (3) Centrifugal separation of cooling crystallization: transport the dipotassium hydrogen phosphate slurry to the crystallizer with a delivery pump to cool down to 40°C, cool and cryst...

Embodiment 2

[0060] A production method of dipotassium hydrogen phosphate, specifically comprising the following steps:

[0061] (1) Preparation of urea phosphate solution: put urea phosphate solid in a dissolving tank, add a certain amount of water into the dissolving tank, stir evenly at 30 r / min to obtain a urea phosphate solution, and heat up to 45°C;

[0062] (2) Synthesis by adding potassium hydroxide: transport the urea phosphate solution to the reaction tank with a delivery pump, and add the metered potassium hydroxide solid into the reaction tank according to the molar ratio of urea phosphate and potassium hydroxide as 1:2.05 , while stirring at a stirring speed of 60r / min, and controlling the reaction temperature at 90°C, reacting for 70min, and controlling the end point pH value to 9.5 to obtain dipotassium hydrogen phosphate slurry;

[0063] (3) Cooling crystallization and centrifugation: transport the dipotassium hydrogen phosphate slurry to the crystallizer with a transport p...

Embodiment 3

[0066] A production method of dipotassium hydrogen phosphate, specifically comprising the following steps:

[0067] (1) preparation of potassium hydroxide solution: potassium hydroxide solid is placed in dissolving tank, a certain amount of water is added into dissolving tank, adopts 30r / min to stir evenly, obtains potassium hydroxide solution;

[0068] (2) Synthesis by adding urea phosphate: the potassium hydroxide solution is transported to the reaction tank by a delivery pump, and the metered urea phosphate solid is added to react with it according to the ratio of 1:2 in the molar ratio of urea phosphate and potassium hydroxide, At the same time, stir at a speed of 55 r / min, and control the reaction temperature at 70°C, react for 50 minutes, and control the pH value at the end point to 8.5 to obtain dipotassium hydrogen phosphate slurry;

[0069] (3) Cooling crystallization and centrifugation: transport the dipotassium hydrogen phosphate slurry to the crystallizer with a de...

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Abstract

The invention relates to the technical field of chemical engineering and particularly relates to a production method of dipotassium phosphate. The method comprises the following step: carrying out a reaction on urea phosphate and potassium hydroxide in a stirring manner for 20 to 70 minutes by controlling a reaction temperature within 50 DEG C to 90 DEG C and controlling a pH (Potential Of Hydrogen) value at a final point of the reaction within 8 to 9.5 so as to prepare the dipotassium phosphate product. The produced dipotassium phosphate product completely conforms to the standard of food-grade dipotassium phosphate by controlling the whole process conditions, i.e., the content of the dipotassium phosphate is between 98.15% and 98.31%, the pH (10g / L of solution) is between 8.9 and 9.2, the content of water insoluble matters is between 0.11% and 0.17%, the content of fluorides is between 8.04mg / kg and 9.13mg / kg, the content of arsenic is between 2.03mg / kg and 2.71mg / kg, the content of heavy metal is between 8.9mg / kg and 9.4mg / kg as well as the loss on drying is between 1.64% and 1.82% according to physical and chemical indexes in a manner of sampling analysis.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of dipotassium hydrogen phosphate. Background technique [0002] Dipotassium hydrogen phosphate can be used as fermentation agent, flavoring agent, leavening agent, mild alkaline agent for dairy products, yeast food, etc. in the food industry; it can also be used as a bacterial culture medium, raw material for making potassium pyrophosphate, liquid fertilizer, and Corrosion inhibitor of diol antifreeze, feed nutritional supplement, etc.; widely used in national production. At present, dipotassium hydrogen phosphate mainly uses thermal phosphoric acid or wet purified phosphoric acid as production raw materials. Due to high energy consumption and heavy pollution in the production process of thermal phosphoric acid, with the shortage of energy sources, environmental pollution is becoming more and more serious. The preparation of dipotassium hydrogen ph...

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 韩朝应陈肖虎廖吉星彭宝林王先炜徐园
Owner GUIYANG KAILIN FERTILIZER CO LTD
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