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Stirring method for cooling crystallization of potassium dihydrogen phosphate solution

A technology of potassium dihydrogen phosphate and stirring method, applied in solution crystallization, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of affecting the flow field of the cooling tank, affecting the crystallization mass transfer process, etc., and achieve the effect of improving efficiency

Inactive Publication Date: 2013-02-06
CHANGSHU YUANQI CRYSTAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But stirring faces a new problem: stirring will affect the flow field in the cooling tank, and ultimately affect the mass transfer process of crystallization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Pass 3°C cooling water into the cooling pipe outside the cooling tank;

[0024] (2) Add potassium dihydrogen phosphate solution to 1m 3 in the cooling tank;

[0025] (3) Start the stirring rod to stir the potassium dihydrogen phosphate solution in the cooling tank at a speed of 300 rpm;

[0026] (4) When the potassium dihydrogen phosphate solution is added to 2 / 3 of the liquid level in the cooling tank, feed cooling water at 2°C into the cooling pipe;

[0027] (5) The stirring rod stirs the potassium dihydrogen phosphate solution in the cooling tank at a speed of 120 rpm until the potassium dihydrogen phosphate solution fills up the cooling tank and crystallizes completely.

[0028] The time for the potassium dihydrogen phosphate solution to crystallize completely in the cooling tank is 80 minutes, and the obtained crystal particle size is uniform without large crystallization.

Embodiment 2

[0030] (1) Pass cooling water at 5°C into the cooling pipe outside the cooling tank;

[0031] (2) Add potassium dihydrogen phosphate solution to 1m 3 in the cooling tank;

[0032] (3) Start the stirring rod to stir the potassium dihydrogen phosphate solution in the cooling tank at a speed of 300 rpm;

[0033] (4) When the potassium dihydrogen phosphate solution is added to 1 / 2 of the liquid level in the cooling tank, the cooling water at 1°C is passed into the cooling pipe;

[0034] (5) The stirring rod stirs the potassium dihydrogen phosphate solution in the cooling tank at a speed of 100 rpm until the potassium dihydrogen phosphate solution fills up the cooling tank and crystallizes completely.

[0035] The time for the potassium dihydrogen phosphate solution to crystallize completely in the cooling tank is 70 minutes, and the obtained crystal particle size is uniform without large crystallization.

Embodiment 3

[0037] (1) Pass the cooling water at 4°C into the cooling pipe outside the cooling tank;

[0038] (2) Add potassium dihydrogen phosphate solution to 1m 3 in the cooling tank;

[0039] (3) Start the stirring rod to stir the potassium dihydrogen phosphate solution in the cooling tank at a speed of 250 rpm;

[0040] (4) When the potassium dihydrogen phosphate solution is added to 1 / 2 of the liquid level in the cooling tank, the cooling water at 0°C is passed into the cooling pipe;

[0041] (5) The stirring rod stirs the potassium dihydrogen phosphate solution in the cooling tank at a speed of 150 rpm until the potassium dihydrogen phosphate solution fills up the cooling tank and crystallizes completely.

[0042] The time for the potassium dihydrogen phosphate solution to crystallize completely in the cooling tank is 75 minutes, and the obtained crystal particle size is uniform without large crystallization.

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PUM

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Abstract

The invention discloses a stirring method for cooling crystallization of a potassium dihydrogen phosphate solution. With the adoption of the method, the cooling crystallization efficiency of the potassium dihydrogen phosphate solution can be improved effectively while the crystallization quality is guaranteed. The method comprises the following steps that: (1) a cooling tube outside a cooling tank is filled with water at 3-5 DEG C, (2) the potassium dihydrogen phosphate solution is added into the cooling tank, (3) a stirring rod is started to stir the potassium dihydrogen phosphate solution in the cooling tank at 250-300rpm, (4) when the potassium dihydrogen phosphate solution is added to the cooling tank to a half or one third of liquid level, cooling water at 0-2 DEG C is introduced into the cooling tube, and (5) the potassium dihydrogen phosphate solution in the cooling tank is stirred by the stirring rod at 100-150rpm till the cooling tank is fully filled with the potassium dihydrogen phosphate solution and the crystallization is completed.

Description

technical field [0001] The invention relates to a stirring method, in particular to a stirring method for cooling crystallization of potassium dihydrogen phosphate solution. Background technique [0002] In the purification process of potassium dihydrogen phosphate, the granular finished potassium dihydrogen phosphate must be obtained after steps such as dissolution, cooling and crystallization, centrifugal separation, and drying. [0003] Generally, in order to improve the dissolving efficiency of potassium dihydrogen phosphate, it is necessary to heat it during the dissolving process. The heating temperature is about 30-135°C, generally about 135°C, so that the dissolved potassium dihydrogen phosphate solution has a higher temperature . [0004] However, the potassium dihydrogen phosphate solution requires a lower temperature (below 5°C) during the crystallization process, and the potassium dihydrogen phosphate solution needs to be cooled for crystallization efficiency. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30B01D9/02
Inventor 皇甫杏花
Owner CHANGSHU YUANQI CRYSTAL MATERIAL
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