Production method of potassium dihydrogen phosphate

A technology of potassium dihydrogen phosphate and production method, applied in chemical instruments and methods, sulfate/bisulfate preparation, phosphorus compounds, etc., can solve the problems of extractant poisoning, high product cost, high energy consumption, and achieve reaction conditions The effect of mildness, good product quality and low reaction temperature

Inactive Publication Date: 2003-04-23
SICHUAN HONGDA (GRP) CO LTD
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Problems solved by technology

[0006] 4. Ion exchange method: use ion exchange resin to separate H 2 PO 4 - and K + Potassium dihydrogen phosphate is generated during the adsorption and regeneration process. The biggest disadvantage of this production method is that the amount of evaporated water is too large and the energy consumption is too high
This production method has three problems: one is that the extraction agent is expensive; the other is that the poisoning of the extraction agent is not easy to solve; the third is that the processing of by-products is difficult
The biggest problem with this method is that the phosphate rock powder has a high fluorine content, and insoluble potassium fluorosi

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Embodiment Construction

[0045] Whole technological process of the present invention sees figure 1 , figure 2,image 3. The production method consists of five sections including preparation of potassium hydrogen sulfate, solution extraction, crystallization and separation of potassium dihydrogen phosphate, fractionation of methanol and phosphoric acid, and phosphate processing. The following combination figure 1 , figure 2 , Fig. 3 further illustrate the production method of the present invention, this production method operates by following sulfonation, hydrolysis, extraction, filtration, filtrate concentration, crystallization and separation, drying, fractionation steps:

[0046] (1), sulfonation: first add hot water and potassium chloride to a corrosion-resistant reaction kettle with a heating jacket (such as an enamel reaction kettle) in a ratio of 1:1, start the agitator and feed steam into the jacket to raise the temperature, Then slowly add sulfuric acid (excess 20%), the reaction temperat...

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Abstract

The production method of potassium dihydrogen phosphate uses the calcium hydrogen phosphate whose impurities of iron, aluminium, fluorine and sulfur are low as raw material, and is implemented by adopting technological processes of potassium hydrogen sulfate preparation, solution extraction, potassium dihydrogen phosphate crystallization and separation ,and its operation includes the following steps: fulfonation, hydrolysis, extraction, filtration, filtrate concentration, crystallization and separation, drying and fractionation. Its reaction condition is moderate, its potassium yield is high,at the same time the quality of potassium dihydrogen phosphate and phosphoric acid can be ensured.

Description

technical field [0001] The invention relates to a production method of potassium dihydrogen phosphate, and at the same time relates to the industrial-grade phosphoric acid or phosphate produced in conjunction with the production method of potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate [KH 2 PO 4 ] Contains two nutrients, phosphorus and potassium, with high purity and high concentration. It is an ideal chemical fertilizer variety, which has a significant effect on increasing production of various crops. In recent years, the market for potassium dihydrogen phosphate to make liquid fertilizers is gradually expanding; since the salt index of potassium dihydrogen phosphate is relatively low, it will not increase the salt index of the soil after application, so it is especially favored by vegetable farmers, fruit farmers and horticultural circles. . With the advancement of agricultural technology, potassium dihydrogen phosphate has ...

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Application Information

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IPC IPC(8): B01D11/04C01B25/30C01D5/02
Inventor 王鹤楼刘沧龙赵道全刘海龙黄大雄
Owner SICHUAN HONGDA (GRP) CO LTD
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