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Deammonation Method in procedure for producing sodium persulfate

A technology of sodium persulfate and production process, applied in the field of deamination in the production process of sodium persulfate, can solve the problems such as difficulty in reaching the quality level of sodium persulfate, low yield and quality of sodium persulfate, reduction of gas desorption area and the like , to achieve good ammonia desorption effect, increase ammonia desorption area, reduce side reactions and the effect of decomposition rate

Active Publication Date: 2007-10-10
XILONG SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because ammonia and sodium persulfate can have side reactions in the solution, directly leading to the decomposition of active oxygen, therefore, the yield and quality of sodium persulfate in the existing production process are not high
The deamination methods disclosed by CN1220969 and CN1315593 are in the reactor, deamination under reduced pressure (100~200mmHg) and heating (below 50°C), and the time is controlled within 60 minutes; its main disadvantage: because the solution is in a conventional reactor In the middle operation, the gas desorption area is relatively small during the decompression and deamination process. Due to the limitation of temperature and vacuum degree, the gas desorption is not complete, resulting in decomposition in the subsequent concentration process.
Therefore utilize reactor deamination, the sodium persulfate of production is difficult to reach the quality level of product requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 50 kilograms of ammonium persulfate with a content of 97.23wt% was added to 22 kilograms of water, and after dissolving, 58 kilograms of an aqueous sodium hydroxide solution with a content of 32.16wt% were stirred and reacted in a closed reactor. After coarse filtration, it is sent to a bag filter for secondary filtration with a corrosion-resistant pump. After testing the filtrate, the ammonia content was 5.2wt%.

[0014] After the filtration, the filtrate was preheated in a water bath, and the temperature of the water bath was 38°C. The filtrate is sent to a thin-film evaporator with an evaporation area of ​​2 square meters at a rate of 1000 liters / hour for deamination operation. The vacuum degree of the inner cavity of the thin film evaporator is above -0.092MPa, the temperature of the water bath on the outer wall of the thin film evaporator is 68°C, and the rotation speed of the scraper is 130 rpm. The flow time of the solution on the walls of the evaporator is abo...

Embodiment 2～5

[0018] According to the operating steps of Example 1, repeat the test after changing the technical parameters, the results obtained are listed in the following table. The mother liquor after the concentrated separation of the previous embodiment was combined with the solution after the deamination of the next embodiment, and the concentration was circulated, and the weight of the mother liquor after Example 5 was completed successively 35.4 kilograms, and the sodium persulfate content was 52.1wt%. Thus it can be seen that the yield after ammonium persulfate is converted into sodium persulfate is 96.7%, and the purity is more than 99.5%.

[0019] Reality

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PUM

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Abstract

This invention discloses a method for deamination during sodium persulfate production. The method comprises: pre-heating sodium persulfate solution produced from ammonium persulfate solution and NaOH solution to 30-50 deg.C, and passing through an evaporator with a surface temperature of 60-80 deg.C under (-0.090)-(-0.098) MPa. The thickness of the solution layer is 0.1-5 mm. The method can realize deamination at a high temperature within a short time, thus has an ideal deamination effect, and has reduced side reactions and decomposition rate with high purity and yield.

Description

technical field [0001] The invention relates to a production method of sodium persulfate, which is a deamination method in the production process of sodium peroxide. Background technique [0002] Sodium persulfate is a strong oxidant, widely used in electronics industry, petrochemical industry, textile industry, paper industry, environmental protection industry, etc. due to its continuous and stable oxidation performance. [0003] Persulfates mainly include ammonium persulfate, sodium persulfate and potassium persulfate. The preparation method mainly uses ammonium sulfate and sulfuric acid as raw materials to electrolytically prepare ammonium persulfate, and the ammonium persulfate can be obtained by vacuum concentration or cooling and crystallization. On the basis of ammonium persulfate, react with sodium hydroxide to prepare sodium persulfate, and react with potassium hydroxide to prepare potassium persulfate. Potassium persulfate is relatively easy to prepare by deamina...

Claims

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Application Information

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IPC IPC(8): C01B15/08
Inventor 李金荣张志洪黄伟鹏刘志平庄景发郑鹤立
Owner XILONG SCI CO LTD
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