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Process for preparing peroxide urea

A technology of urea peroxide and urea, applied in the direction of organic chemistry and the like, can solve the problems of poor stability of urea peroxide, unstable product form and high production cost, and achieve the effects of improving storage stability, improving stability and simple production process.

Inactive Publication Date: 2003-05-21
陶华西
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The production of existing urea peroxide usually adopts 27.5% hydrogen peroxide and urea as raw materials, adding 8-hydroxyquinoline as a stabilizer, and direct addition reaction makes it. Because the urea peroxide stability prepared by this production process is relatively poor, the product The form is not fixed, and the reaction is required to be carried out at a low temperature, and the yield is low, so the production cost after being put into production is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 15.0g of hydrogen peroxide and 0.3g of hydroxyethylidene diphosphonic acid stabilizer into a 250ml three-necked flask, place the three-necked flask on an electric heating mantle and heat it to 30-40°C, then add it while heating 18.0g urea, after dissolving completely, add 0.2g sodium hexametaphosphate as crystal habit improver, continue to stir and react for about 30 minutes, the reaction temperature should not be higher than 50°C, after the reaction, slowly cool at -5~5°C for at least 4 hour, then separate and dry to obtain the urea peroxide product, its purity is 94.8%, and the product yield is 87.5%.

Embodiment 2

[0018] In a 250ml three-necked flask, add 15.0g of hydrogen peroxide with a mass percentage concentration of 50% or more and a mixture of 0.3g of salicylic acid and ammonium dihydrogen phosphate as a stabilizer, place the three-necked flask on an electric heating mantle and heat it to 30-40°C, Then add 18.0g of urea while heating. After the dissolution is complete, add 0.2g of 8-hydroxyquinoline and continue to stir for about 30 minutes. The reaction temperature should not be higher than 50°C. 4 hours, and then separated and dried to obtain a white granular urea peroxide product with a purity of 93.2% and a product yield of 86.9%.

Embodiment 3

[0020] The urea peroxide granular white crystal prepared by the method described in embodiment 2 is coated with the mixture of sodium sulfate and sodium lauryl sulfate, wherein the addition of sodium sulfate is 0.9% of the urea peroxide weight, The addition amount of sodium lauryl sulfate is 0.3% of the weight of urea peroxide, which is prepared into a concentrated solution, mixed evenly with white crystals, and dried to obtain a coated urea peroxide product. Example 4:

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Abstract

The preparation method of urea peroxide uses hydrogen peroxide and urea as raw material, and is characterized by that adding urea in hydrogen peroxide whose mass percentage concentration is above 50%, at the same time adding stabilizing agent and crystal habit modification agent, after reaction, obtaining wet urea peroxide, drying to obtain white crystal granules, at the same time coating the surface of said urea peroxide white crystal granule with a layer of coating compound. Said invention is economic and practical, its simple batch yield rate can be up to above 85%, the ure peroxide content is up to above 92%.

Description

technical field [0001] The invention relates to a preparation method of urea peroxide, which belongs to the technical field of peroxide preparation in inorganic chemistry. Background technique [0002] Urea peroxide, also known as urea hydrogen peroxide, carbamide peroxide, carbamide peroxide, urea hydrogen peroxide, urea hydrogen peroxide, etc., is white powder, flake or granular crystal, non-toxic and tasteless. It is obtained by the reaction of hydrogen peroxide and urea, and its molecular formula is CO(NH 2 ) 2 ·H 2 o 2 , the molecular weight is 94.07, the theoretical hydrogen peroxide content is 36.17%, and the active oxygen content is 17.02%. It has good stability at low temperature, but it begins to soften or viscous and liquefy at 65-75°C, and the concentration of active oxygen drops greatly. [0003] Urea peroxide is a new type of fine chemical product. It is also an efficient, safe and easy-to-use solid disinfectant, oxygenator and bleaching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C409/00C07C409/40
Inventor 陶华西冯军池宋燕何建丽郑龙
Owner 陶华西
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