Use of sulfamic acid or its salts as stabilizers especially in combination with ammonium salt and/or ammine for bleach or other halogen containing biocides in the paper area

摘要

Disclosed is a method of preventing the growth of microorganisms in a paper making process water stream comprising treating the water stream with a composition comprising: a halogen source, urea, and an additional sulphur bearing halogen stabilizer such as sulfamic acid, wherein the molar ratio of sulfamic acid to halogen atoms in the halogen source is 2:1. In certain embodiments the halogen source is selected from the group consisting of: chlorine, sodium hypochlorite, 1,3,5-Trichloroisocyanuric acid (TCCA), 1-bromo-3-chloro-5,5-dimethyl-2,4-imidazolidedione (BCDMH) and 1,3-dichloro-5,5-dimethyl-2,4-imidazolidedione (DCDMH).