Preparation method of ammonium persulfate crystal

A technology of ammonium persulfate and crystals, which is applied in the field of preparation of ammonium persulfate crystals, can solve the problems of small particle size and poor fluidity, and achieves the effects of low equipment requirements, simple operation and process cost saving.

Active Publication Date: 2019-04-23
河北中科同创科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the continuous development and research of the use of ammonium persulfate, the requirements for ammonium persulfate in the indu...

Method used

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  • Preparation method of ammonium persulfate crystal
  • Preparation method of ammonium persulfate crystal
  • Preparation method of ammonium persulfate crystal

Examples

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preparation example Construction

[0024] The invention provides a kind of preparation method of ammonium persulfate crystal, comprising the following steps:

[0025] Provide a mixed material liquid of ammonium persulfate and ammonium sulfate, the mass concentration ratio of ammonium persulfate and ammonium sulfate in the mixed material liquid is 1: (2~3);

[0026] Add ammonium persulfate seed crystals when controlling the temperature of the mixture liquid at 20-25°C, and then cool down to -2-6°C at a cooling rate of 5-15°C / h to obtain ammonium persulfate crystals.

[0027] The invention provides a mixed material liquid of ammonium persulfate and ammonium sulfate, the mass concentration ratio of ammonium persulfate and ammonium sulfate in the mixed material liquid is 1:(2~3), preferably 1:(2.2~2.8), more Preferably it is 1:(2.4-2.6). In the present invention, the concentration of ammonium persulfate in the mixture liquid is preferably 180-220 g / L, more preferably 190-210 g / L. In the present invention, the pH ...

Embodiment 1

[0045] Provide 6000L of mixed material liquid of ammonium persulfate and ammonium sulfate, wherein the pH value is adjusted to 7.0 with ammonia gas;

[0046] Pass the mixed material liquid into the crystallization tank (initial temperature is 26°C), set the stirring speed and cooling speed, and carry out uniform cooling, then add ammonium persulfate seed crystals to the system, and continue to proceed at the same cooling rate. Cool down; when the temperature is lowered to the termination temperature at a uniform rate, grow crystals at the termination temperature for 20 minutes, then centrifuge the obtained system at a speed of 5000 r / min for 15 minutes, and dry the obtained solid at 80°C for 30 minutes to obtain ammonium persulfate crystals. Other operating parameters are listed in Table 1 along with the average particle size and purity of the resulting ammonium persulfate crystals.

Embodiment 2～12

[0048] Ammonium persulfate crystals were prepared according to the method of Example 1, and the average particle size and purity of some operating parameters and the obtained ammonium persulfate crystals are listed in Table 1.

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Abstract

The invention relates to the technical field of inorganic salt crystallization, in particular to a preparation method of an ammonium persulfate crystal. Since cooling rate and temperature of ammoniumpersulfate seed crystal added are controlled, the growth rate of ammonium persulfate crystal is much higher than the nucleation rate, the obtained ammonium persulfate crystal has large grain, uniformgrain size, high crystallinity and good fluidity, has good compatibility with other materials in practical application, and is not easy to be affected by caking during storage and transport in use. The preparation method has the advantages of high operational simplicity, low requirements to equipment and the like, and can save processing cost.

Description

technical field [0001] The invention relates to the technical field of inorganic salt crystallization, in particular to a method for preparing ammonium persulfate crystals. Background technique [0002] Ammonium persulfate is colorless monoclinic crystal or white powder crystal, easily soluble in water, and its solubility increases in warm water. Dry ammonium persulfate has good stability, and it is easy to be damp and agglomerated in humid air. [0003] Ammonium persulfate is widely used in the fields of chemical industry, light industry, electronics, petroleum and food industry, such as the polymerization initiator of vinyl chloride compounds, especially for emulsion polymerization and redox polymerization; it is widely used in metal Cleaning corrosion inhibitor, especially for the etching of copper in the production of circuit boards; it can also be used as a fracturing agent for oil exploitation, a desizing agent for textiles, an oxidizing agent for aniline dyes, a rubb...

Claims

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Application Information

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IPC IPC(8): C01B15/08
CPCC01B15/085C01P2004/52C01P2004/60C01P2004/61
Inventor 高毅颖郭强王洋洋王硕贾志军李达
Owner 河北中科同创科技发展有限公司
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