Patent GB-581946-A (GB)
Title: Improvements in cleansing, sterilizing and similar operations
IPC: C11D9/00
Filed: 1944-04-27
Abstract: A method of inhibiting the formation of a precipitate in an aqueous cleansing solution containing a soluble lithium compound, such as the hypochlorite, chloride, chlorate, or hydroxide, and another metal compound such as a soap, fluoride, carbonate, orthophosphate or silicate, which normally will react with the lithium compound with formation of a precipitate, comprises including in the solution a water-soluble polyphosphate.  Lithium hypochlorite and the polyphosphate may be added to the solution p  either separately or concurrently preferably as a single composition.  Inert diluents such as sodium chloride, potassium chloride, calcium sulphate and sodium sulphate may be present in the composition.  Suitable polyphosphates are sodium tetra-meta-phosphate, Na4P4O12, sodium penta-meta-phosphate, Na5P5O15, sodium hexa-meta-phosphate, Na6P6O18, sodium tetra-phosphate, Na6P4O13, sodium tripoly-phosphate, Na5P3O10, sodium pyrophosphate, Na4P2O7, and the corresponding phosphates of potassium.  Examples are given.  Specifications 581,944, 581,945 and 581,948 are referred to.ALSO:A method of inhibiting the formation of a precipitate in an aqueous bleaching solution containing lithium hypochlorite and another metal compound such as a soap, fluoride, carbonate, orthophosphate or silicate, which normally will react with the lithium salt with the formation of a precipitate, comprises including in the solution a water-soluble polyphosphate.  The hypochlorite and the poly phosphate may be added either separately or concurrently preferably as a single composition.  Inert diluents such as sodium chloride, potassium chloride, calcium sulphate and sodium sulphate may be present in the composition. Suitable polyphosphates are sodium tetra-meta-phosphate Na4P4O12, sodium penta-metaphosphate Na5P5O15, sodium hexa-meta-phosphate Na8P6O16, sodium tetra-phosphate Na6 P4O13, sodium tripoly-phosphate, Na5P3O10, sodium pyrophosphate, Na4P2O7 and the corresponding phosphates of potassium.  Examples are given.  Specifications 581,944, 581,945 and 581,948, [all in Group III], are referred to.ALSO:A method of inhibiting the formation of a precipitate in an aqueous disinfecting solution containing a soluble lithium compound, such as the hypochlorite, chloride, chlorate or hydroxide and another metal compound such as a soap, fluoride, carbonate, ortho-phosphate or silicate, which normally will react with the lithium compound with the formation of a precipitate, comprises including in the solution a water-soluble polyphosphate. Lithium hypochlorite and the polyphosphate may be added to the solution either separately or concurrently preferably as a single composition.  Inert diluents such as sodium chloride, potassium chloride, calcium sulphate and sodium sulphate may be present in the composition.  Suitable polyphosphates are sodium tetra-meta-phosphate, Na4P4O12, sodium penta-meta-phosphate, Na5P5O15, sodium hexa-meta-phosphate, Na6P6O18, sodium tetra-phosphate, Na6P4O13, sodium tripoly-phosphate, Na5P3O10, sodium pyro-phosphate, Na4P2O7, and the corresponding phosphates of potassium.  Examples are given.  Specifications 581,944, 581,945 and 581,948, [all in Group III], are referred to.