Method for preparing bromourea

摘要

The invention provides a process for manufacturing biocidal compositions containing bromourea derivatives, including the reaction of salts or adducts of the urea derivatives with an oxidizer.

主权项

1. A method for manufacturing bromourea comprising
(i) providing an aqueous solution comprising a salt or adduct of urea of the general structure A-U, where A stands for an acid selected from HBr or HCl and U stands for urea, (ii) providing an aqueous solution of an oxidizer, and (iii) combining at least two liquid streams, one of which comprises the solution provided in step (i) and the other one comprises the solution provided in step (ii) whereby forming bromourea or chlorourea and adding to said streams a solution comprising bromide source if said acid is HCl, thereby obtaining an acidic composition comprising said bromourea wherein said urea is in a molar excess over said acid, and the molar ratio of said acid to said oxidizer is at least 1.0, said solutions being stored as stable precursors and being optionally diluted before combining said streams in situ, and wherein the active bromine in the combined streams, measured as the total chlorine by iodometry is up to 5%.