Preparation process for rapidly-dissolving granular sodium percarbonate

A technology for sodium percarbonate and preparation process, applied in the field of inorganic salts, can solve problems such as being difficult to meet the requirements of sodium percarbonate, and achieve the effects of being environmentally friendly, reducing production costs, and having small investment in equipment

Active Publication Date: 2015-04-22
ZHEJIANG JINKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-solubility sodium percarbonate basically meets the requirement of dissolution rate by grinding powder, and the granular type is basically above 40s, which is difficult to meet the requirements of sodium percarbonate as an oxidation aid for organic synthesis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 5kg of light soda ash to a 20L double cone mixer, add 19.1g of solid stabilizer magnesium sulfate at the same time, weigh 4.38kg of hydrogen peroxide solution (in the form of H 2 o 2 50.1% in total), and add 0.1kg of diethylenetriaminepentamethylenephosphonic acid (DTPMP) and its sodium salt solution, stir and mix evenly. Spray the prepared hydrogen peroxide solution into the double cone mixer, turn on the refrigerated circulating water to cool down, when the hydrogen peroxide spray reaches 3.5kg, the water content of the system is 20.9%, stop spraying the hydrogen peroxide solution, and stir for 2 minutes to complete the reaction. Add 1.7kg of granulated Yuanming powder, and the sodium percarbonate powder instantly becomes expanded wet granules of sodium percarbonate. Dry in a small fluidized bed to obtain dry fast-dissolving sodium percarbonate granules with 10% active oxygen, 1.5% moisture, 0.15-1.2mm particle size, and a T90 (20°C) of 18s.

Embodiment 2

[0019] Add 6kg of light soda ash to a 20L double cone mixer, add 44.7g of solid stabilizer sodium metasilicate at the same time, weigh 4.2kg of hydrogen peroxide solution (in the form of H 2 o 2 60.2% in total), and add 0.08kg of diethylenetriaminepentamethylenephosphonic acid (DTPMP) and its sodium salt solution, stir and mix evenly. Spray the prepared hydrogen peroxide solution into the double cone mixer, turn on the refrigerated circulating water to cool down, when the hydrogen peroxide spray reaches 3.34kg, the water content of the system is 15.6%, stop spraying the hydrogen peroxide solution, and stir for 2 minutes to complete the reaction. Add 1.54kg of granulated sodium sulfate and 0.4kg of light soda ash granules, and the sodium percarbonate powder instantly becomes puffed wet granules of sodium percarbonate, dried in a small fluidized bed to obtain fast-dissolving sodium percarbonate with 11.2% active oxygen Dry granules, moisture 1.2%, particle size 0.15-1.2mm, T90 ...

Embodiment 3

[0021] Add 10kg of light soda ash to a 20L double cone mixer, add 142g of solid stabilizer sodium tripolyphosphate at the same time, weigh 8.75kg of hydrogen peroxide solution (in H 2 o 2 50.1% in total), and add 0.9kg of diethylenetriaminepentamethylenephosphonic acid (DTPMP) and its sodium salt solution, stir and mix evenly. Spray the prepared hydrogen peroxide solution into the double-cone mixer, turn on the refrigerated circulating water to cool down, when the hydrogen peroxide is sprayed to 7kg (the water content in the system is 21.9%), stop spraying the hydrogen peroxide solution, and stir for 2 minutes to complete the reaction. Add 2.1 kg light soda ash granules and 28g sodium carboxymethyl cellulose (CMC), stirred for 3 minutes, the sodium percarbonate powder instantly becomes expanded sodium percarbonate wet granules. Small-scale fluidized bed drying, to obtain 12.0% active oxygen fast Dissolved sodium percarbonate dry product, moisture 0.8%, particle size 0.15-...

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Abstract

The invention relates to a preparation process for rapidly-dissolving granular sodium percarbonate. The process mainly comprises the following steps: preparing a hydrogen peroxide solution; spraying a hydrogen peroxide solution on lightweight sodium carbonate; stopping spraying of the hydrogen peroxide solution when water content of sodium carbonate powder is controlled to be 15 to 25% and adding a granulation auxiliary agent to allow sodium percarbonate to be converted into puffed particles from powder; etc. According to the invention, extrusion granulation and spray granulation in conventional dry methods are changed; and low-active oxygen granular sodium percarbonate is prepared only by simply mixing raw materials, adding the special granulation auxiliary agent in the process of a reaction when water content of sodium carbonate powder is controlled to be 15 to 25% so as to allow sodium percarbonate to be converted into puffed particles from powder, controlling the range of active oxygen in a product and finally carrying out drying. The dissolution rate T90 (20 DEG C) of granular sodium percarbonate prepared by using the process can be reduced to less than 25 s, so every requirement on sodium percarbonate used as an oxidation auxiliary agent for organic synthesis at home and abroad can be met.

Description

technical field [0001] The invention belongs to the technical field of inorganic salts, in particular to a preparation process of fast-dissolving granular sodium percarbonate. Background technique [0002] Sodium percarbonate is also known as sodium percarbonate. Sodium percarbonate is easily soluble in water, releases active oxygen, and has the functions of bleaching, sterilizing, degreasing and washing. It is widely used as an additive for detergents and washing powder, and is also used in daily chemical products such as toothpaste and cosmetics. . As a new type of high-efficiency detergent bleach, it is odorless, non-toxic and non-polluting. Because the active oxygen generated by decomposition in water has a bleaching effect, sodium percarbonate shows a strong decontamination ability. Therefore, compared with traditional phosphorus and boron detergent builders, it not only has strong detergency, but also does not damage the ecological environment. , has become one of...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B15/10
Inventor章小兵章伟新虞建立魏一帆谢晋
OwnerZHEJIANG JINKE CHEM