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Method for preparing monopotassium phosphate by using wet-process phosphoric acid

A technology of potassium dihydrogen phosphate and wet-process phosphoric acid, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of unstable product quality, difficult to handle by-products, long process lines, etc., to achieve stable product quality, The process route is short and the effect of overcoming the complex process

Inactive Publication Date: 2014-05-21
GUIYANG KAILIN FERTILIZER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of method that prepares potassium dihydrogen phosphate with wet-process phosphoric acid, solve the problem that in the existing potassium dihydrogen phosphate production technology, process line is longer, product quality is unstable, energy consumption is high, and by-product is difficult to handle. Environmental issues

Method used

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  • Method for preparing monopotassium phosphate by using wet-process phosphoric acid
  • Method for preparing monopotassium phosphate by using wet-process phosphoric acid
  • Method for preparing monopotassium phosphate by using wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Impurity removal of wet-process phosphoric acid:

[0043] The solid impurities contained in the wet-process phosphoric acid with a concentration of 15% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0044] (2) Synthesis reaction of intermediates:

[0045] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 60°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 1.1:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 80min;

[0046] (3) Cooling and crystallization to obtain the intermediate:

[0047] After the synthesis reaction is completed, put the obtained intermediate slurry into the cooling crystallization tank and cool it to a temperature of 20°C to c...

Embodiment 2

[0051] (1) Impurity removal of wet-process phosphoric acid:

[0052] The solid impurities contained in the wet-process phosphoric acid with a concentration of 40% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0053] (2) Synthesis reaction of intermediates:

[0054] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 70°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 1:1 to determine, stir to dissolve and keep warm for reaction, and the reaction time is 100min;

[0055] (3) Cooling and crystallization to obtain the intermediate:

[0056] After the synthesis reaction is completed, put the obtained intermediate slurry into the cooling crystallization tank to cool to a temperature of 30°C, centrifuge a...

Embodiment 3

[0060] (1) Impurity removal of wet-process phosphoric acid:

[0061] The solid impurities contained in the wet-process phosphoric acid with a concentration of 50% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0062] (2) Synthesis reaction of intermediates:

[0063] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 80°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 0.95:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 60min;

[0064] (3) Cooling and crystallization to obtain the intermediate:

[0065] After the synthesis reaction is finished, put the obtained intermediate slurry into a cooling crystallization tank to cool to a temperature of 40°C, centrifug...

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Abstract

The invention discloses a method for preparing monopotassium phosphate by using wet-process phosphoric acid. The method comprises the following steps: reacting carbonyl diamide and wet-process phosphoric acid to obtain an intermediate; reacting the intermediate and potassium hydroxide to prepare a monopotassium phosphate product. The method has the advantages of short process route, low energy consumption, stable product quality, low production cost, convenience in operation and safety in production. A side product, namely, slurry can be recycled completely, an entire production process is environment-friendly, clean and free from pollution, and no waste gas, waste water or waste residues are discharged. A response is made to the policy calling of energy saving, emission reduction and clean production, the problems of complex process, instable product quality, high energy consumption and environmental pollution existing in the prior art are solved, and the purity of the obtained monopotassium phosphate product is more than or equal to 98 percent.

Description

technical field [0001] The invention relates to a method for preparing potassium dihydrogen phosphate with wet-process phosphoric acid, which belongs to the technical field of chemical industry. Background technique [0002] Potassium dihydrogen phosphate is a new type of high-concentration phosphorus and potassium two-element compound fertilizer, which contains about 52% of phosphorus pentoxide and about 34% of dipotassium oxide. It is widely used in foliar spraying, root drip irrigation, and soilless cultivation. , greenhouse vegetables, horticultural flowers and water-saving agriculture and other fields. Potassium dihydrogen phosphate with high purity can also be used as bacterial culture medium, starter, nutrient and condiment. Due to the wide range of uses of potassium dihydrogen phosphate, the demand is increasing day by day, and the production methods are also varied, but there are still different shortcomings in each production method. The ion-exchange method uses ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 徐魁陈肖虎廖吉星朱飞武郑超彭宝林韩朝应王先炜周勇唐哓宁李继伟王睿
Owner GUIYANG KAILIN FERTILIZER CO LTD
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