Method for producing urea peroxide

Abstract

The invention provides a method for producing urea peroxide. The method comprises the following steps: introducing molten urine into a dissolving tank after urine from a urea synthesizing tower is subjected to primary and secondary evaporation purification, and preparing a urea saturated solution from the urine; then, adding into a tubular reactor by virtue of a metering pump, and simultaneously adding hydrogen peroxide having concentration of 30 percent or above and a stabilizing agent which is 1-2 percent of the mass of urea into the reactor, wherein the stabilizing agent is prepared by mixing monopotassium phosphate and polyethylene glycol in a ratio of 1:1; reacting the urea, hydrogen peroxide and the stabilizing agent in the tubular reactor to generate a urea peroxide solution; cooling the solution by virtue of a cooler, and separating out the urea peroxide crystal, centrifuging the mixed liquid by virtue of a centrifugal machine to remove urea peroxide mother liquor; drying the urea peroxide crystal in a drier to prepare a urea peroxide product, packaging and warehousing. According to the method, urea and urea peroxide can be co-produced, continuous production can be realized, yield can be greatly improved, product stability is high, and raw material cost can be reduced.

Description

technical field [0001] The invention relates to the field of urea production, in particular to a process method which combines a urea synthesis device and a urea peroxide production device to realize continuous, stable and automatic production of urea peroxide. Background technique [0002] Urea peroxide, also known as carbamide peroxide, carbamide peroxide, urea hydrogen peroxide, and carbamide peroxide, is an adduct of urea and hydrogen peroxide, and its appearance is white crystalline powder, flake or granular solid. The molecular formula is CO(NH 2 ) 2 ·H 2 o 2 , molecular weight 94.07, aqueous solution contains both urea and H 2 o 2 properties, decomposed into urea, H in water 2 o 2 And atomic oxygen, and slowly release oxygen, the theoretical content of active oxygen is 17.02%. This product contains active oxygen and has the functions of bleaching, sterilization and disinfection. High content of active oxygen, good stability of aqueous solution, can be made ...

AI Technical Summary

Problems solved by technology

The limited volume of the oven also limits the production of urea peroxide

The existing production methods have low output, low degree of automation, relatively long production time, and cannot be continuously produced.

There are many types of stabilizers and film-forming agents added at the same time, the production cost is high, and there are problems such as secondary energy consumption. It is suitable for laboratory preparation or pilot production, but not suitable for large-scale industrial production, and it is not suitable for urea production enterprises to realize urea and urea. Coproduction of urea peroxide

[0004] The stabilizer mentioned in Chinese patent CN200610052828.7 "A Preparation Method of Urea Peroxide" is a mixture of zinc tartrate, tartaric acid and dodecylbenzenesulfonate; there are many types of stabilizers and the cost is high

It uses a stabilizer and a crystal habit modifier at the same time, and one or more mixtures need to be coated on the product. The production process is complicated and the production is difficult.

Images