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Improved process for producing sodium persulfate

A technology of sodium persulfate and ammonium persulfate, applied in the direction of peroxyhydrate/peroxyacid, etc., can solve the problems of sodium persulfate product loss, low purity of sodium persulfate, insufficient crystallization separation, etc., to reduce loss , shorten the reaction time, improve the effect of purity

Active Publication Date: 2022-05-03
铜陵华兴精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This mass fraction of lye will cause the reaction liquid level in the kettle to be high, the reaction temperature to be high, and the reaction time to be long
However, sodium persulfate is unstable at high temperature and will decompose, resulting in low purity of sodium persulfate obtained subsequently, generally not exceeding 99%.
And the currently obtained sodium persulfate mother liquor generally undergoes a crystallization separation after vacuum evaporation, and then through freezing and crystallization separation, it is easy to have insufficient crystallization separation, resulting in the loss of sodium persulfate product

Method used

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  • Improved process for producing sodium persulfate

Examples

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Effect test

Embodiment 1

[0028] A kind of improved technique of producing sodium persulfate, comprises the following steps:

[0029] Step 1. Add ammonium persulfate and water into the stirring tank, and after stirring for 20 minutes, the resulting mixture is sent into the reaction tank, and sodium hydroxide solution is added at the same time, raised to the reaction temperature, preheated for 10 minutes, and then reacted at -0.08MPa. Obtain sodium persulfate mother liquor and ammonia gas, wherein, the mass ratio of sodium persulfate, sodium hydroxide is 18:10, and reaction temperature is 30 ℃, and the reaction time is 6h, and ammonium persulfate is the ammonium persulfate after recrystallization treatment, and persulfate The mass ratio of ammonium sulfate and water is 1:1.5, and the mass fraction of sodium hydroxide solution is 46%;

[0030] Step 2, the ammonia gas obtained in step 1 is absorbed through the absorption liquid in the absorption tank, wherein, the absorption liquid is the ammonium persulf...

Embodiment 2

[0034] A kind of improved technique of producing sodium persulfate, comprises the following steps:

[0035] Step 1. Add ammonium persulfate and water into the stirring tank, and after stirring for 20 minutes, the resulting mixture is sent into the reaction tank, and sodium hydroxide solution is added at the same time, raised to the reaction temperature, preheated for 10 minutes, and then reacted at -0.06MPa. Obtain sodium persulfate mother liquor and ammonia gas, wherein, the mass ratio of sodium persulfate and sodium hydroxide is 20:13, reaction temperature 35 ℃, reaction time is 4h, and ammonium persulfate is ammonium persulfate after recrystallization treatment,, The mass ratio of ammonium persulfate and water is 1:2, and the mass fraction of sodium hydroxide solution is 48%;

[0036] Step 2, the ammonia gas obtained in step 1 is absorbed through the absorption liquid in the absorption tank, wherein, the absorption liquid is the ammonium persulfate solution containing sulfu...

Embodiment 3

[0040] A kind of improved technique of producing sodium persulfate, comprises the following steps:

[0041] Step 1. Add ammonium persulfate and water into the stirring tank, and after stirring for 30 minutes, the resulting mixture is sent into the reaction tank, and sodium hydroxide solution is added at the same time, raised to the reaction temperature, preheated for 10 minutes, and then reacted at -0.05MPa. Obtain sodium persulfate mother liquor and ammonia gas, wherein, the mass ratio of sodium persulfate and sodium hydroxide is 22:15, reaction temperature is 45 ℃, reaction time is 3h, ammonium persulfate is ammonium persulfate after recrystallization treatment,, The mass ratio of ammonium persulfate and water is 1:2.5, and the mass fraction of sodium hydroxide solution is 50%;

[0042] Step 2, the ammonia gas obtained in step 1 is absorbed through the absorption liquid in the absorption tank, wherein, the absorption liquid is the ammonium persulfate solution containing sulf...

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Abstract

The invention discloses an improved process for producing sodium persulfate, which belongs to the technical field of sodium persulfate production, and comprises the following steps: step 1, adding ammonium persulfate and water into a stirring tank, stirring, feeding the obtained mixture into a reaction tank, adding a sodium hydroxide solution, heating to a reaction temperature, preheating, and reacting to obtain a sodium persulfate mother solution and ammonia gas; 2, the ammonia gas obtained in the step 1 is absorbed by absorption liquid in an absorption tank; and 3, treating the sodium persulfate mother liquor obtained in the step 1 through a heat exchanger, a circulating evaporator and a crystallization separator to obtain wet sodium persulfate crystals and a residual solution, and drying the wet sodium persulfate crystals to obtain a sodium persulfate product. According to the improved process for producing the sodium persulfate, provided by the invention, steam generated by a reaction system is utilized to the maximum extent, the energy consumption is reduced, the loss of the sodium persulfate in the production process is small, and the obtained sodium persulfate product is high in purity.

Description

technical field [0001] The invention belongs to the technical field of sodium persulfate production, and in particular relates to an improved process for producing sodium persulfate. Background technique [0002] Sodium persulfate is a strong oxidizing agent. Due to its continuous and stable oxidation performance, it is widely used in the fields of electronics industry, petrochemical industry, textile industry, paper industry, environmental protection industry, etc. Therefore, the market demand for sodium persulfate is particularly large. [0003] The existing process route of industrial production of sodium persulfate: first react ammonium persulfate and sodium hydroxide aqueous solution, and then obtain sodium persulfate crystals through deamination treatment, concentrated crystallization, centrifugation and other processes of the obtained solution. In the production technology of above-mentioned sodium persulfate, the massfraction of sodium hydroxide is usually 32%. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/08
CPCC01B15/08C01P2006/80Y02P20/10
Inventor 冯建彬牛俊祥刘明龙
Owner 铜陵华兴精细化工有限公司
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