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A kind of method utilizing phosphoric acid raffinate to prepare potassium dihydrogen phosphate

A technology of potassium dihydrogen phosphate and raffinate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of reducing the utilization rate of raffinate, restricting large-scale production, and shortage of high-quality phosphoric acid, etc., to achieve Less water consumption, lower production costs, and improved utilization

Active Publication Date: 2016-02-17
上海新增鼎数据科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses thermal phosphoric acid and potassium alkali as raw materials, the production cost is high, and it is difficult to apply in agriculture. It is mainly used for the production of food, medicine and industrial grade potassium dihydrogen phosphate
[0005] Chinese patent (Patent No. 201110159163.0) discloses a method for producing potassium dihydrogen phosphate with food-grade phosphoric acid as a raw material. The method has the advantages of simple process for producing potassium dihydrogen phosphate, high product quality and easy industrial application. However, the method The method requires expensive potassium hydroxide and food-grade phosphoric acid, and the production cost is high, which limits large-scale production, and the mother liquor is discarded after 5 cycles, which increases the pollution to the environment
[0006] Due to the shortage of high-quality phosphoric acid and the existing method is to use phosphoric acid raffinate to prepare monoammonium hydrogen phosphate and diammonium hydrogen phosphate, the product quality is not high, which greatly reduces the utilization rate of raffinate, and a method is urgently needed to improve acid utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 500kg of phosphoric acid raffinate as raw material, add 45kg of hydrogen peroxide and 220kg of water to it, heat and stir, make the temperature rise to 90°C, stop heating, start to slowly add 306kg of triethylamine to adjust the pH of phosphoric acid raffinate to 7, Filtrate to obtain filter residue and filtrate, hydrogen peroxide can remove organic impurities in phosphoric acid raffinate. Adding potassium hydroxide in the filter residue can reclaim triethylamine, and the recovery rate of triethylamine reaches 92%. Add 156kg potassium chloride saturated solution to the filtrate to make the filtrate precipitate crystals, and then add 150kg water to it to remove the precipitated crystals. Completely dissolve, then filter, concentrate and dry the filtrate to obtain 331.5 kg of finished potassium dihydrogen phosphate, with a yield of 87%, and the content of potassium dihydrogen phosphate is 98.7%. The potassium chloride saturated solution used in the present embodiment...

Embodiment 2

[0029] Take 500kg of phosphoric acid raffinate as raw material, add 35kg of hydrogen peroxide and 15kg of activated carbon to it, let stand for 2 hours, add 200kg of water to dilute and filter, add dropwise 350kg of triethylamine to the filtrate to adjust the pH of phosphoric acid raffinate to 7.5 , filter to obtain filter residue and filtrate, hydrogen peroxide can remove organic impurities in phosphoric acid raffinate. Adding potassium hydroxide in the filter residue can reclaim triethylamine, and the recovery rate of triethylamine reaches 92%. Add 175kg potassium chloride saturated solution to the filtrate to make the filtrate precipitate crystals, and then add 150kg water to it to remove the precipitated crystals. Dissolve completely, then filter again, concentrate and dry the filtrate to obtain 339 kg of finished potassium dihydrogen phosphate, with a yield of 88.9%, and the content of potassium dihydrogen phosphate is 98.8%.

Embodiment 3

[0031] Take 500kg of phosphoric acid raffinate as raw material, add 50kg of hydrogen peroxide and 250kg of water to it, heat and stir, make the temperature rise to 60°C, stop heating, start to slowly add 310kg of triethylamine to adjust the pH of phosphoric acid raffinate to 6.5, Filtrate to obtain filter residue and filtrate, hydrogen peroxide can remove organic impurities in phosphoric acid raffinate. Adding potassium hydroxide in the filter residue can reclaim triethylamine, and the recovery rate of triethylamine reaches 91%. Add 160kg potassium chloride saturated solution to the filtrate to make the filtrate precipitate crystals, and then add 150kg water to it to remove the precipitated crystals. Dissolve completely, then filter again, concentrate and dry the filtrate to obtain 330 kg of finished potassium dihydrogen phosphate, the yield is 87%, and the content of potassium dihydrogen phosphate is 97.7%.

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Abstract

The invention discloses a method for preparing potassium dihydrogen phosphate by using extraction residual acid of phosphoric acid. The method comprises the steps of taking extraction residual acid as a raw material, removing organic impurities by using hydrogen peroxide, activated carbon and water, then adjusting the PH value to be 6.5-7.5 by using triethylamine, adding a proper amount of a potassium chloride saturated solution, filtering, concentrating and drying to obtain potassium dihydrogen phosphate; or, after removing the organic impurities, adjusting the PH value of the extraction residual acid to be 6.5-7.5 by using a potassium hydroxide solution of which the weight content is 45-50%, filtering, then adjusting the PH value of the extraction residual acid to be 8.5-10.5 by using the potassium hydroxide solution of which the weight content is 45-50%, filtering, then adjusting the PH value of the extraction residual acid to be 3.8-4.1 by using a phosphoric acid solution of which the weight content is 80-85%, filtering, concentrating and drying filtrate obtained through filtration to prepare potassium dihydrogen phosphate. According to the method disclosed by the invention, potassium dihydrogen phosphate is prepared by adopting the extraction residual acid of phosphoric acid to ensure that the utilization rate of extraction residual acid of phosphoric acid is more than 85%, so that the utilization rate of extraction residual acid of phosphoric acid is improved; the purity of prepared potassium dihydrogen phosphate is about 98%, so that the beneficial effects are improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of chemical engineering, and more specifically, embodiments of the present invention relate to a method for preparing potassium dihydrogen phosphate by using phosphoric acid raffinate. Background technique [0002] The production method of purified phosphoric acid is to use extractant to extract phosphoric acid from wet-process phosphoric acid to obtain industrial-grade and food-grade evolved phosphoric acid. During production, the remaining phosphoric acid after extraction becomes raffinate. During the production process of purified phosphoric acid, wet A large number of impurities in the phosphoric acid have entered the raffinate. Therefore, in addition to the phosphoric acid raffinate containing P 2 o 5 In addition to 40% to 50%, it also contains a variety of impurities: Mg, Fe, Al and other metal ions. Usually, the content of each metal ion ranges from 0 to 3%, and phosphoric acid raffinate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30
Inventor 钟林钟国林韩科
Owner 上海新增鼎数据科技有限公司