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A kind of method that obtains potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor

A technology for neutralization of potassium dihydrogen phosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as uneven thickness of potassium dihydrogen phosphate, low yield, poor product appearance quality, etc. Good quality, high yield, and the effect of improving competitive advantage

Active Publication Date: 2019-10-22
WENGFU DAZHOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for obtaining potassium dihydrogen phosphate by heating and neutralizing concentrated mother liquor, which is used to solve the existing problem in the prior art: in the method for obtaining potassium dihydrogen phosphate by neutralization, the obtained potassium dihydrogen phosphate is uneven in thickness , low yield, poor product appearance and other technical problems

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  • A kind of method that obtains potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor
  • A kind of method that obtains potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor

Examples

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Embodiment 1

[0040] A method for obtaining potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor, such as figure 1 shown, including the following steps:

[0041] S1: first add the concentrated mother liquor into the reactor, the reactor is equipped with an acid adjustment device, and acid is added dropwise into the reactor through the acid adjustment device, and the first neutralization reaction is carried out to obtain the first neutralization liquid, The pH value of the first neutralizing solution is 6.5;

[0042] S2: The reaction kettle is also equipped with a heating device and a stirring device, the temperature of the first neutralizing liquid is gradually raised by the heating device, and stirred by the stirring device, when the temperature of the first neutralizing liquid rises to 100°C , and then slowly add acid to the reactor through the acid adjustment device, and carry out the second neutralization reaction. , the frequency instruction on the f...

Embodiment 2

[0047] A method for obtaining potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor, such as figure 1 shown, including the following steps:

[0048] S1: first add the concentrated mother liquor into the reactor, the reactor is equipped with an acid adjustment device, and acid is added dropwise into the reactor through the acid adjustment device, and the first neutralization reaction is carried out to obtain the first neutralization liquid, The pH value of the first neutralizing solution is 6.8;

[0049] S2: The reaction kettle is also equipped with a heating device and a stirring device. The temperature of the first neutralizing liquid is gradually raised by the heating device, and stirred by the stirring device. When the temperature of the first neutralizing liquid rises to 102°C , and then slowly add acid to the reactor through the acid adjustment device, and carry out the second neutralization reaction. , the frequency instruction on the...

Embodiment 3

[0054] A method for obtaining potassium dihydrogen phosphate by warming up and neutralizing concentrated mother liquor, such as figure 1 shown, including the following steps:

[0055] S1: first add the concentrated mother liquor into the reactor, the reactor is equipped with an acid adjustment device, and acid is added dropwise into the reactor through the acid adjustment device, and the first neutralization reaction is carried out to obtain the first neutralization liquid, The pH value of the first neutralizing solution is 6.9;

[0056] S2: The reaction kettle is also equipped with a heating device and a stirring device, and the temperature of the first neutralizing liquid is gradually raised by the heating device, and stirred by the stirring device, and when the temperature of the first neutralizing liquid rises to 105°C , and then slowly add acid to the reactor through the acid adjustment device, and carry out the second neutralization reaction. , the frequency instructio...

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Abstract

The invention discloses a method for preparing potassium dihydrogen phosphate from concentrated mother liquor by means of heating and neutralizing. The method includes steps of S1, adding the concentrated mother liquor into a reaction kettle, dropwise adding acid into the reaction kettle by the aid of an acid regulating device in the reaction kettle and carrying out primary neutralization reactionto obtain first neutralization solution; S2, gradually heating the first neutralization solution by the aid of a heating device in the reaction kettle, slowly adding acid into the reaction kettle bythe aid of the acid regulating device when the temperature of the first neutralization solution is increased and reaches 100-110 DEG C, and carrying out secondary neutralization reaction at the temperature of 105-115 DEG C to obtain second neutralization solution; S3, naturally stirring the second neutralization solution in the reaction kettle for 20 minutes, starting cooling water and cooling thesecond neutralization solution for the cooling time of 50-70 minutes to obtain crystals; S4, cooling the crystals and then discharging the crystals at the discharging temperatures of 80-100 DEG C under the control.

Description

technical field [0001] The invention relates to the technical field of potassium dihydrogen phosphate preparation, specifically, a method for obtaining potassium dihydrogen phosphate by heating and neutralizing concentrated mother liquor. Background technique [0002] The chemical formula of potassium dihydrogen phosphate is KH 2 PO 4 , is a colorless tetragonal crystal or white crystalline powder, which is prone to deliquescence when placed in the air. [0003] There are many methods for producing potassium dihydrogen phosphate, usually neutralization method, extraction method, ion exchange method, double decomposition method, direct method, crystallization method and electrolysis method. In China, the production process mostly adopts neutralization method, followed by organic extraction method, double decomposition method, ion exchange method and so on. [0004] The chemical reaction formula for producing potassium dihydrogen phosphate by neutralization method is: [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30
Inventor 余建国
Owner WENGFU DAZHOU CHEM CO LTD