Patent GB-830753-A (GB)
Title: Composition having bleaching, sterilizing and disinfecting properties, and method of preparation thereof
IPC: C11D3/395
Filed: 1957-08-16
Abstract: A dihalocyanuric compound is formed by halogenating cyanuric acid. In acid solution, the acid is formed and, in basic solution, the salt of the corresponding cation.  Dichloro-, dibromo- and diiodo-cyanuric acid compounds may be so formed. Salts of sodium, potassium, lithium, barium, calcium, thorium, aluminium and thallium are specified. Dichlorocyanuric acid may be formed by dissolving in an aqueous medium, carbon tetrachloride, or chloroform, one molar equivalent of cyanuric acid and two molar equivalents of hydroxide ion and introducing into the solution two molar equivalents of a chlorinating agent. The hydroxide ion may be provided by sodium hydroxide and the chlorinating agent may be gaseous chlorine.  In an alternative process, dichlorocyanuric acid is prepared by mixing one mol. of cyanuric acid and two mols of trichlorocyanuric acid in water.  In Example (4), a slurry so formed at 24 DEG  C. is spray-dried.  The dichlorocyanuric acid may be admixed with a "carrier" salt, which may be a buffer, and with a detergent.  Carrier salts specified are sodium sulphate, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, trisodium phosphate, sodium tetraphosphate, sodium tripolyphosphate, sodium tetraborate and sodium silicate.  Halides and ammonium salts are excluded.  In examples, detergent compositions are formed by (5) spraydrying an aqueous slurry containing trichlorocyanuric acid, cyanuric acid, sodium sulphate, sodium tripolyphosphate and dodecylbenzenesulphonate; and (6) admixing trichlorocyanuric acid, cyanuric acid, sodium sulphate and sodium tripolyphosphate in water to form a plastic mass, drying at 20 DEG C., pulverizing, drying at 95 DEG  C., and screening.  In Example (7) a composition comprises dichlorocyanuric acid, sodium sulphate decahydrate and sodium tripolyphosphate.ALSO:A bleaching and washing composition comprises a dihalocyanuric acid or salt thereof and a non-hygroscopic alkali-metal salt of an inorganic acid, which is inert thereto.  Inorganic salts specified are sodium sulphate, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, trisodium phosphate, sodium tetraphosphate, sodium tripolyphosphate, sodium tetraborate and sodium silicate. Dichloro-, dibromo- and diiodo-cyanuric acids and their salts with sodium, potassium, lithium, barium, calcium, thorium, aluminium and thallium are specified.  The compositions may also include a detergent.  In aqueous solutions at 100 p.p.m. the composition may provide a pH of 6.5 to 9.5.  Dry compositions may be formed by mixing the ingredients in water and spray drying, or by forming an aqueous, plastic mass, drying, pulverizing and screening.  In examples, compositions comprise (5) dichlorocyanuric acid, sodium sulphate, sodium tripolyphosphate and dodecylbenzene sulphonate; (6) dichlorocyanuric acid, sodium sulphate and sodium tripolyphosphate; (7) dichlorocyanuric acid, sodium sulphate decahydrate and sodium tripolyphosphate.ALSO:A disinfecting composition comprises a dihalocyanuric acid or salt thereof and a non-hygroscopic alkali metal salt of an inorganic acid, which is inert thereto.  Inorganic salts specified are sodium sulphate, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, trisodium phosphate, sodium tetraphosphate, sodium tripolyphosphate, sodium tetraborate and sodium silicate. Dichloro-, dibromo- and di-iodo-cyanuric acids and their salts with sodium, potassium, lithium, barium, calcium, thorium, aluminium and thallium are specified.  The compositions may also include a detergent.  In aqueous solutions at 100 p.p.m. the composition may provide a pH of 6.5 to 9.5.  Dry compositions may be formed by mixing the ingredients in water and spray drying, or by forming an aqueous, plastic mass, drying, pulverizing and screening. In examples, compositions comprise: (5) dichlorocyanuric acid, sodium sulphate, sodium tripolyphosphate, dodecylbenzene sulphonate; (6) dichlorocyanuric acid, sodium sulphate and sodium tripolyphosphate; (7) dichlorocyanuric acid, sodium sulphate decahydrate and sodium tripolyphosphate.