Perhydrol urea

Urea peroxohydrate is made commercially by Solvay Deutschland, Degussa (Germany), and Mitsubishi Gas Chemical. It is known commercially as urea hydrogen peroxide, hydrogen peroxide carbamide, Exterol, Hydroperit, Hydroperit, Hyperol, Orti2on, Percarbamid, Percarbamide, Perhydrit, Perhydrol-Urea, Thenardol, and UHP. In 1994 the U.K. price was J7—8/kg ( 10—12/kg). World production in 1993 was several hundred metric t. 

Chemical Designations - Synonyms Carbamide peroxide, Carbonyldiamine, Hydrogen peroxide carbamide, Percarbamide, Perhydrol-Urea, Urea hydrogen peroxide Chemical Formula ... 

SYNS CARBAMIDE PEROXIDE GLY-OXIDE HYDROGEN PEROXIDE CARBAMIDE HYDROPERIT HYPEROL ORTIZON PERCARBAMIDE PERHYDRIT PERHYDROL-UREA THENARDOL UREA DIOXIDE UREA HYDROGEN PEROXIDE pOT) UREA HYDROGEN PEROXIDE SALT UREA HYDROPEROXIDE UREA PEROXIDE pOT)... 

Urea Peroxide Carbamide Peroxide Carbonyldiamine Hydrogen Peroxide Carbamide Percarbamide Perhydrol- Urea... 

Perhydrogeraniol. See 3,7-Dimethyl-1 -octanol Perhydrol-urea. See Urea peroxide Perhydronaphthalene. See Decahydronaphthalene cis-Perhydronaphthalene. See cis-Decalin Perhydrosqualene. See Squalane 97% HLS Periclase] 98% 1LS Periclase] 98% 3LS Periclase] Periclase 96/H-D/8-1] Periclase 97% HLS] Periclase 98/1-1] Periclase 98% 3LS] Periclase 98% ILS] Periclase. See Magnesium oxide... 

Synonyms Carbamide peroxide Hydrogen peroxide carbamide Hydrogen peroxide with urea (1 1) Percarbamide Perhydrol-urea Urea dioxide Urea hydrogen peroxide Urea hydroperoxide Empirical CH6N2O3 Formula H2NCONH2 H2O2 Properties Wh. cryst. orcryst. powd. sol. in water. 

Parabanic acid can be prepared by the condensation of urea with diethyl oxalate in an ethanolic solution of sodium ethoxide,2 by reaction of urea with an ethereal solution of oxalyl chloride,3 by oxidizing uric acid with an acid solution of perhydrol,4 or by the action of hot, concentrated nitric acid on uric acid.5 The present method gives better yields than the previously reported methods and is better adapted to larger-scale preparations. 

Among the great number of organic compounds known as stabilizers the following must be mentioned benzoic, salicylic, acetic and hippuric acids, phenacetin, naphtalene, oxalic acid, acetamide, urea etc. A combination of sodium pyrophosphate (0.5 to 1 g per 1.) and benzoic or sylicylic acid (0.4 g per 1.) is frequently used. This has particularly good results with peroxide for technical purposes. In pharmaceutical products the amount of pyrophosphate added is reduood and the amount of benzoic acid increased. For other purposes hippuric aoid (1 g per 1.) with a slight admixture of phosphoric acid is used as stabilizer. Perhydrol is the peroxide used for analytical purposes. It is redistilled three times in order to remove any impurities. This product requires no stabilizer. 

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