Production method of calcium dihydrogen phosphate

A technology of calcium dihydrogen phosphate and production methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high production cost, heavy pollution, unstable product quality, etc., shorten the production process, The effect of reducing production costs and significant environmental protection value

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

AI Technical Summary

Problems solved by technology

[0003] At present, industrial calcium dihydrogen phosphate is mainly used in feed, food additives, gypsum abrasives, plastic stabilizers and pharmaceutical additives. It is produced by neutralization method and metathesis method; among them, the neutralization method is neutralized by thermal phosphoric acid, food-grade phosphoric acid or wet-process purified phosphoric acid and calcium hydroxide (or limestone), and then washed, centrifugally dehydrated, dried, and pulverized Obtain product, its process production cost is high, energy consumption is high, pollution is big, process route is long, economic benefit is not high, is unfavorable for environmental protection; Mixed solution, then add calcium chloride solution to carry out metathesis reaction, and then neutralize until the pH of the reaction slurry is about 3.0. This method has a long process flow and the incorporation of chloride ions in the middle, so the product quality is unstable.
[0004] For example, the patent No. 01108797.8 "A Production Method of Feed Grade Calcium Dihydrogen Phosphate" is obtained by mixing dilute phosphoric acid and defluorinated tricalcium phosphate, and the material is crushed and aged for 12-24 hours, dried and sieved, because phosphate rock is directly used The tricalcium phosphate obtained by calcination and defluorination of stone is used as raw material to produce calcium dihydrogen phosphate products. During the calcination process, waste gas will be emitted into the air, which is not conducive to environmental protection. long process
[0

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Embodiment 1

[0045] A production method of calcium dihydrogen phosphate, specifically comprising the following steps:

[0046] (1) Preparation of urea phosphate solution: put 2 kmol of urea phosphate solid in a dissolving tank and heat up to 40°C, add water to prepare a 78% urea phosphate solution by mass, stir evenly, and after metering, use a delivery pump to transfer to the synthesis groove;

[0047] (2) Add calcium hydroxide: After all the urea phosphate solution is transferred into the synthesis tank, control the temperature at 50°C, and add saturated calcium hydroxide solution while stirring according to the ratio of calcium hydroxide to urea phosphate molar ratio of 0.95:2 , after stirring and reacting for 20 minutes, simultaneously control the stirring speed to be 40r / min, detect the pH value, and when the pH value is 3, the reaction is terminated to obtain calcium dihydrogen phosphate slurry;

[0048] (3) Cooling crystallization: transfer the calcium dihydrogen phosphate slurry i...

Embodiment 2

[0051] A production method of calcium dihydrogen phosphate, specifically comprising the following steps:

[0052] (1) Preparation of urea phosphate solution: put 3kmol urea phosphate solution in a dissolving tank and heat up to 60°C, add water to make urea phosphate solution with a mass percentage of 82%, stir evenly, and after metering, use a delivery pump to transfer to synthesis groove;

[0053] (2) Add calcium hydroxide: after the urea phosphate solution is all transferred to the synthesis tank, control the temperature to 70°C, and add calcium hydroxide solid while stirring according to the ratio of calcium hydroxide to urea phosphate molar ratio of 1.05:2. After stirring and reacting for 50 minutes, control the stirring speed to 80 r / min at the same time, and check the pH value. When the pH value is 3.5, the reaction is terminated to obtain calcium dihydrogen phosphate slurry;

[0054] (3) Cooling and crystallization: transfer the calcium dihydrogen phosphate slurry into...

Embodiment 3

[0057] A production method of calcium dihydrogen phosphate, specifically comprising the following steps:

[0058] (1) Preparation of urea phosphate solution: put 4 kmol of urea phosphate solid in a dissolving tank and heat up to a temperature of 50°C, add water to prepare a urea phosphate solution with a mass percentage of 80%, stir evenly, and after metering, use a delivery pump to transfer to the synthesis groove;

[0059] (2) Add calcium hydroxide: After all the urea phosphate solution is transferred to the synthesis tank, control the temperature at 60°C, and add the molar concentration of 30% while stirring according to the ratio of calcium hydroxide to urea phosphate molar ratio of 1:2 Calcium hydroxide solution, after stirring and reacting for 35min, control the stirring speed at the same time to be 60r / min, detect the pH value, when the pH value is 3.3, the reaction is terminated to obtain calcium dihydrogen phosphate slurry;

[0060] (3) Cooling and crystallization: t...

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Abstract

The invention relates to the technical field of chemical engineering and in particular relates to a production method of calcium dihydrogen phosphate. According to the method, urea phosphate and calcium hydroxide directly react at 50-70 DEG C for 20-50 minutes under a stirring condition to prepare calcium dihydrogen phosphate. The method has the advantages that since calcium dihydrogen phosphate is prepared by reacting high-purity urea phosphate with calcium hydroxide, the defect in a production technology in which calcium dihydrogen phosphate is directly produced from phosphoric acid is overcome, the production process of calcium dihydrogen phosphate is simplified, and the production cost is reduced; the process conditions are accurately controlled, so that the purity of calcium dihydrogen phosphate is improved and the quality of calcium dihydrogen phosphate is stable and completely reach the standard of feed-grade calcium dihydrogen phosphate.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of calcium dihydrogen phosphate. Background technique [0002] Calcium dihydrogen phosphate is a colorless triclinic flaky, granular or crystalline powder inorganic compound with a strong sour taste. It does not absorb moisture when it is pure and contains trace impurities. Decomposes, soluble in dilute hydrochloric acid, dilute nitric acid and dilute acetic acid, slightly soluble in water, insoluble in ethanol, widely used as feed additive for aquaculture animals and livestock and poultry animals, as leavening agent, dough conditioner, buffer agent , Nutritional supplements, emulsifiers, stabilizers and other quality improvers can improve the complexation of metal ions, pH value, and ionic strength of food, and can improve the adhesion and water holding capacity of food. my country stipulates that it is used in bread, biscuits, and baking powder, a...

Claims

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Application Information

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IPC IPC(8): C01B25/32
Inventor 石秀明廖吉星王先炜彭宝林郑超周勇周宾
Owner GUIYANG KAILIN FERTILIZER CO LTD
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