GB893439A - Improvements in compositions having oxidising properties - Google Patents

Abstract

Scouring compositions suitable for removing stains from unglazed porcelain surfaces comprise a water-soluble monopersulphate and a water-soluble chloride, the cation of which is compatible (i.e. does not react or precipitate) with the monopersulphate. Specified chlorides are the alkali and alkaline-earth metal chlorides and magnesium and ammonium chlorides, and specified monopersulphates are the alkali-metal monopersulphates and ammonium, calcium, barium, zinc and aluminium monopersulphates. The preferred monopersulphate obtained is by reacting a mixture of monopersulphuric and sulphuric acids with potassium carbonate or hydroxide and drying the resulting mixture, the acids being in the proportions to give KHSO5: KHSO4: K2SO4 in molar proportions of about 2:1:1. The composition may be prepared by intimately mixing the solid, water-soluble monopersulphate and the solid, water-soluble chloride in their anhydrous forms in the ratio of chloride ion (reckoned as NaCl) to active oxygen between 1:100 and 20:1. The monopersulphate content of the solid composition is preferably equivalent to 0,05-5% of active oxygen based on the total weight of the composition. A suitable abrasive filler for use in the composition comprises about 90% of ground quartz flour, 5% of sodium tripolyphosphate, 3% of a sodium alkaryl sulphonate detergent and a perfume, the remainder being sodium sulphate. Specifications 428,142, 428,148 and 893,440 are referred to.ALSO:A composition having oxidising properties and suitable for bleaching textiles comprises a water-soluble monopersulphate and a watersoluble chloride, the cation of which is compatible (i.e. does not react or precipitate) with the monopersulphate. Specified chlorides are the alkali and alkaline-earth metal chlorides and magnesium and ammonium chlorides, and specified monopersulphates are the alkali-metal monopersulphates and ammonium, calcium, barium, zinc and aluminium monopersulphates. The preferred monopersulphate is obtained by reacting a mixture of monopersulphuric and sulphuric acids with potassium carbonate or hydroxide and drying the resulting mixture, the acids being in the proportions to give KHSO5: KHSO4: K2SO4 in molar proportions of about 2 : 1 : 1. The composition may be prepared by intimately mixing the solid, water-soluble monopersulphate and the solid, water-soluble chloride in their anhydrous forms in the ratio of chloride ion (reckoned as NaCl) to active oxygen between 1 : 100 and 20 : 1. The monopersulphate content of the solid composition is preferably equivalent to 0.05%-5% of active oxygen, based on the total weight of the composition. When dissolved in water the composition preferably contains a concentration of monopersulphate corresponding to 50-700 p.p.m. of active oxygen and of chloride ion of at least 5 p.p.m. Specifications 428,142, 428,148 and 893,440 are referred to.ALSO:A composition having oxidizing and anti-bacterial properties which, in its anhydrous form, may be used as a scouring composition for removing stains from unglazed porcelain surfaces and, in aqueous solution, may be used for bleaching textiles, comprises a water-soluble monopersulphate and a water-soluble chloride, the cation of which is compatible (i.e. does not react or precipitate) with the monopersulphate. Specified chlorides are the alkali and alkaline-earth metal chlorides and magnesium and ammonium chlorides, and specified monopersulphates are the alkali metal monopersulphates and ammonium, calcium, barium, zinc and aluminium monopersulphates. The preferred monopersulphate is obtained by reacting a mixture of monopersulphuric and sulphuric acids with potassium carbonate or hydroxide and drying the resulting mixture, the acids being in the proportions to give KHSO5 : KHSO4 : K2SO4 in molar proportions of about 2 : 1 : 1. The composition may be prepared by intimately mixing the solid, water-soluble monopersulphate and the solid, water-soluble chloride in their anhydrous forms in the ratio of chloride ion (reckoned as NaCl) to active oxygen between 1 : 100 and 20 : 1. The monopersulphate content of the solid composition is preferably equivalent to 0.05-5% of active oxygen, based on the total weight of the composition. When dissolved in water the composition preferably contains a concentration of monopersulphate corresponding to 50-700 p.p.m. of active oxygen and of chloride ion of at least 5 p.p.m. A suitable abrasive filler for use in scouring compositions comprises about 90% of ground quartz flour, 5% of sodium tripolyphate, 3% of a sodium alkaryl sulphonate detergent and a perfume, the remainder being sodium sulphate. Specifications 428,142, 428,148 and 893,440 are referred to.