Method of joint production of urea hydrogen peroxide and sodium percarbonate

A technology of urea peroxide and sodium percarbonate, applied in the direction of chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, organic compound preparation, etc. To avoid problems such as other methods of urea peroxide, hydrogen peroxide waste, and low production costs, to avoid adverse effects, mild reaction conditions, and reduce production costs

Inactive Publication Date: 2010-07-28
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The method adopted in the current production is mainly: most of the mother liquor decomposes the hydrogen peroxide in it to prepare a sodium carbonate solution for recycling, and a small part of the mother liquor is discharged after treatment. Although the mother liquor can be partially utilized, it is still a is a waste
[0005] In summary, there is no report on the preparation method of urea peroxide that has simple preparation process, low production cost, no environmental pollution, and simultaneously produces sodium percarbonate, and does not see that sodium percarbonate and sodium percarbonate are produced simultaneously. Introduction of other methods for two products of urea peroxide

Method used

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  • Method of joint production of urea hydrogen peroxide and sodium percarbonate
  • Method of joint production of urea hydrogen peroxide and sodium percarbonate
  • Method of joint production of urea hydrogen peroxide and sodium percarbonate

Examples

Experimental program
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Effect test

example 1

[0029] Example 1 (process route sees figure 1 )

[0030] (1) Take 1700g of hydrogen peroxide with a mass concentration of 30% and add it to a 3L three-necked flask, then add 939g of CO(NH 2 ) 2 (Analytical pure) crystals, mechanically stirred and reacted in a constant temperature bath at 0°C, after 120 minutes, urea peroxide crystals will crystallize and precipitate, centrifuge, and dry in a solid phase oven at 60°C to obtain 1018g of white flaky crystal product urea peroxide . Gained mother liquor is that M is 1619g, records H in M ​​mother liquor 2 o 2 The mass percentage content is 8.73%, CO(NH 2 ) 2 The mass percentage content of the hydrogen peroxide is 17.78% (mass ratio is hydrogen peroxide: urea: water=1: 2.04: 8.42).

[0031] (2) Add the above 1619g M mother liquor into a 2L three-necked flask, then add 4.25g water glass, 2.55g magnesium chloride, 0.50g EDTA (as a stabilizer), and add anhydrous Na 2 CO 3 355g (Since water glass, magnesium chloride, EDTA are a...

example 2

[0036] Step (1) (2) is the same as embodiment 1

[0037] (3) Evaporate the mother liquor L obtained in (2) to dryness (all hydrogen peroxide is lost therein), join it in the 5L three-necked flask, then add 1506g CO(NH 2 ) 2 , 2538g mass concentration is 30% H 2 o 2 Solution, after the solid phase is fully dissolved, mechanically stir the reaction in a constant temperature tank at 0°C, and after 60 minutes, urea peroxide crystals will crystallize and precipitate. After being centrifuged by a centrifuge, the solid phase is then placed in an oven at 60°C for drying to obtain 1378 g of white flaky crystal product urea peroxide. Gained filtrate R is 3074g, records H in mother liquor R 2 o 2 The mass percentage content is 8.57%, CO(NH 2 ) 2 The mass percentage content is 29.75%, Na 2 CO 3 The mass percentage content is 3.88%.

[0038] (4) Add the mother liquor R obtained in (3) into a 5L three-neck flask, add 481gNa 2 CO 3 , After the sodium carbonate is fully dissolved,...

example 3

[0041] Step (1) (2) is with embodiment 1;

[0042] (3) Evaporate the mother liquor L obtained in (2) to dryness (all the hydrogen peroxide in it is lost), put it into a 5L three-necked flask, and then add 1500.73gCO (NH 2 ) 2 , 2566.39g mass concentration of 30% H 2 o 2 Solution, after the solid phase is fully dissolved, mechanically stir the reaction in a constant temperature tank at 0°C, and after 60 minutes, urea peroxide crystals will crystallize and precipitate. After centrifugation in a centrifuge, the solid phase is put into an oven at 60° C. for drying to obtain 1395 g of white flaky crystal product urea peroxide. The resulting mother liquor R is 3079.66g, and the H in the R mother liquor is measured 2 o 2 The mass percentage content is 8.63%, CO (NH 2 ) 2 The mass percentage content is 29.17%, Na 2 CO 3 The mass percentage content is 3.88%.

[0043] (4) Add the R mother liquor obtained in (3) into a 5L three-necked flask, add 484gNa 2 CO 3 , After the sodi...

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Abstract

The invention discloses a method of joint production of urea hydrogen peroxide and sodium percarbonate, comprising the following steps: in a material system at the following mass ratio that sodium carbonate: urea: hydrogen peroxide: water is 1:1.30-1.60:0.42-0.45:2.75-3.20, crystallization filtering is carried out at the temperature of 0 DEG C, the obtained solid phase is dried at the temperatureof 60 DEG C to obtain sodium percarbonate, and the residual mother solution S is evaporated and concentrated; and after parts of separated sodium carbonate are evaporated to dryness, urea and hydrogen peroxide of which the mass concentration is 30% are added to ensure that the mass ratio in the system is as follows: sodium carbonate: urea: hydrogen peroxide: water is 1:14.00-16.00:5.50-7.50:14.00-16.50, crystallization filtering is carried out at the temperature of 0 DEG C, the obtained solid phase is urea hydrogen peroxide, and sodium carbonate is added into the liquid phase to ensure that the mass ratio in the system is still as follows: sodium carbonate: urea: hydrogen peroxide: water is 1:1.30-1.60:0.42-0.45:2.75-3.20, and thus cycle production is realized. The invention adopts mild reaction conditions and convenient operation, improves the economy of the urea hydrogen peroxide preparation technology, avoids adverse effect on environment due to mother solution abandonment and lowers production cost.

Description

technical field [0001] The technical scheme of the present invention relates to the preparation method of urea peroxide and sodium percarbonate, particularly the method for the joint production of urea peroxide and sodium percarbonate. Background technique [0002] Urea peroxide [CO(NH 2 ) 2 ·H 2 o 2 ] is a 1:1 adduct formed by hydrogen peroxide binding to urea in a hydrogen bond manner. It is a non-toxic, odorless white crystalline powder. Compared with hydrogen peroxide, peracetic acid and other solid peroxides , Urea peroxide has the characteristics of wide bactericidal spectrum, strong bactericidal power, low concentration, short disinfection time, and no residual toxicity after disinfection. As a solid oxidant and an oxygen source providing reagent, urea peroxide can be widely used in bleaching, textiles, waste treatment, daily chemical industry, medicine, agriculture, aquaculture and other fields. [0003] The production of urea peroxide generally adopts the wet p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C275/02C07C273/02C01B15/10
Inventor 曹吉林兰天洋晏俊秋高丽雅李琳
Owner HEBEI UNIV OF TECH
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