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Preparation method of sodium percarbonate

A technology of sodium percarbonate and sodium carbonate decahydrate is applied in the field of chemical engineering and achieves the effects of good economic benefit, environmental protection and simple implementation process

Active Publication Date: 2021-05-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional wet method, the percarbonate product prepared by this method has a greater increase in active oxygen content, but there is still a large room for improvement in thermal stability and moisture stability.

Method used

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  • Preparation method of sodium percarbonate
  • Preparation method of sodium percarbonate
  • Preparation method of sodium percarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add sodium carbonate decahydrate and circulating mother liquor to the slurry tank at a mass ratio of 2:1, heat up to 30-40°C to dissolve, then add sodium chloride, so that the mass content of sodium chloride in the slurry is 15%, and the obtained The first reaction solution: Add 5 g of ethylenediaminetetraacetic acid (EDTA) and 5 g of aminotrimethylene phosphonic acid (ATMP) into a hydrogen peroxide solution with a mass concentration of 50% per kilogram, stir and dissolve to make a hydrogen peroxide mixed solution, which is the second The reaction solution was cooled to 0-10°C for later use; 100 g of sodium pyrophosphate was added to every kilogram of water, stirred and dissolved to obtain the third reaction solution.

[0049] Add circulating mother liquid into the reaction kettle as the bottom liquid, control the reaction temperature at 18-30°C, and prepare the prepared sodium carbonate decahydrate slurry (first reaction liquid) at 3.41m 3 / h, hydrogen peroxide mixed s...

Embodiment 2

[0051] Add sodium carbonate decahydrate and circulating mother liquor to slurry tank 1 at a mass ratio of 2:1, heat up to 30-40°C to dissolve, then add sodium chloride, so that the mass content of sodium chloride in the slurry is 15-18% , to obtain a first-level first reaction solution; sodium carbonate decahydrate and circulating mother liquor are added to the slurry tank 2 with a mass ratio of 2:1, heated to 30-40 ° C for dissolution, and then sodium chloride is added to make the chlorination in the slurry The mass content of sodium is 26-30%, and the secondary first reaction solution is prepared; 0.5 g of sodium polyacrylate and 0.8 g of hydroxyethylene diphosphoric acid are added to the hydrogen peroxide solution with a mass concentration of 27.5% per kilogram, and stirred and dissolved to prepare The hydrogen peroxide mixed solution is used as the second reaction solution, cooled to 0-10°C for later use; 150 g of sodium tripolyphosphate is added to each kilogram of water, ...

Embodiment 3

[0054] Add sodium carbonate decahydrate and circulating mother liquor to No. 1 slurry tank at a mass ratio of 2:1, heat up to 30-40°C to dissolve, then add sodium chloride, so that the mass content of sodium chloride in the slurry is 15-18 %, to obtain a first-level first reaction solution; aqueous sodium carbonate and circulating mother liquor are added to the No. 2 slurry tank with a mass ratio of 2:1, the temperature is raised to 30-40 ° C for dissolving, and then sodium chloride is added to make the slurry in the slurry The mass content of sodium chloride is 18-26%, and the secondary first reaction solution is obtained; Sodium carbonate decahydrate and circulating mother liquor are added to No. 3 slurry tank with a mass ratio of 2:1, and the temperature is raised to 30-40°C for dissolution , add sodium chloride again, make the mass content of the sodium chloride in the slurry be 26-30%, make three-stage first reaction liquid; Add magnesium sulfate 0.2g, 0.5g of EDTA and 0....

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Abstract

The invention provides a preparation method of stable sodium percarbonate. The stable sodium percarbonate is prepared by reacting and crystallizing sodium carbonate decahydrate, mother liquor and hydrogen peroxide solution. A three-flow feeding mode is adopted, the supersaturation degree of a system is adjusted and controlled through the slurry flow speed and the sodium chloride content, the number of crystal nucleuses is controlled, and therefore the sodium percarbonate spherical particles with different granularities are prepared. The sodium percarbonate product prepared by the method is round and uniform in particle size, the active oxygen content is higher than 14.5%, the thermal stability is higher than 95%, the wet stability is higher than 78%, and particles of 40 meshes or more account for 98.5% of the total particle number.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and relates to a method for preparing stable sodium percarbonate particles. Background technique [0002] Sodium percarbonate (SPC), also known as sodium peroxycarbonate or sodium carbonate peroxyhydrate, has the molecular formula Na 2 CO 3 •1.5H 2 o 2 , odorless, non-toxic, soluble in water, white loose granular or powder, is an inorganic oxidant. The properties of its aqueous solution are similar to the aqueous solution of hydrogen peroxide and sodium carbonate with the corresponding composition, and its chemical properties are as unstable as hydrogen peroxide, and it is easy to decompose when it meets water, heat and heavy metals. Because sodium percarbonate is easily soluble in water and can decompose to release active oxygen, it has strong bleaching and washing capabilities. It is an emerging alkaline bleaching agent. The most widely used industrially is as a bleaching agent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/10
CPCC01B15/103
Inventor 周玲尹秋响杨文超王召张美景侯宝红周丽娜
Owner TIANJIN UNIV
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