Patent GB-761043-A (GB)
Title: Process of stabilisation of hydrogen peroxide
IPC: C01B15/037
Filed: 1952-07-11
Abstract: Hydrogen peroxide is stabilized in the form of a solid product (probably a silicate perhydrate) by combining it with sodium metasilicate to form a gel in the presence of a catalyst consisting of an anhydrous salt of an alkali or alkaline-earth metal, including magnesium, or of aluminium, e.g. sodium carbonate or bicarbonate or sodium, magnesium or aluminium sulphate, which accelerates the formation of a gel, treating the gel with a surface-active substance and then adding a drying agent which absorbs water by hydration to render the gel solid, e.g. anhydrous sodium carbonate.  Any anion-active, cation-active, or non-ionic emulsifying, wetting or detergent substance may be used as the surfaceactive substance, e.g. sulphonated fatty acids and higher aliphatic alcohols.  In the example, a mixture of sodium metasilicate and anhydrous sodium sulphate is added with ice-cooling to 30-35 per cent hydrogen peroxide.  Sulphonated lauryl alcohol is added, with further ice-cooling, as soon as the gel is formed and the water is absorbed by adding small quantities of anhydrous sodium carbonate.  The solid product may be screened and ground.  The granular, flake or powder product has 12.4 per cent hydrogen peroxide content, is water-soluble and liberates oxygen steadily over 8-10 hours.  The product may be used in cold washing baths for cotton, rayon, hemp, flax, jute or broom fibre fabrics.  An activating agent, e.g. a soluble or insoluble manganese salt, may be added to the product for making up the bath, or may be added to the bath already containing the product, to increase the speed of oxygen development.ALSO:Hydrogen peroxide is stabilized in the form of a solid product (probably a silicate perhydrate) by combining hydrogen peroxide with sodium metasilicate to form a gel in the presence of a catalytic agent, consisting of an anhydrous salt, of an alkali metal, of an alkaline earth metal, including magnesium, or of aluminium, e.g. sodium carbonate or bicarbonate, sodium, magnesium or aluminium sulphates, which accelerates the formation of a gel, treating the gel with a surface-active substance and, after the formation of the gel, adding a drying agent which absorbs water by hydration to render the gel solid, e.g. anhydrous sodium carbonate.  Any anion - active, cation-active, or non-ionic emulsifying, wetting, or detergent substance may be used as the surface-active substance, e.g. sulphonated fatty acids and higher aliphatic alcohols.  In the example, a mixture of sodium metasilicate and anhydrous sodium sulphate is added with ice-cooling to 30-35 per cent hydrogen peroxide.  Sulphonated lauryl alcohol is added, with further ice-cooling, as soon at the gel is formed and the water is absorbed by adding small quantities of anhydrous sodium carbonate.  The solid product may be screened and ground.  The granular, flake or powder product has 12.4 per cent hydrogen peroxide content, is water-soluble and liberates oxygen steadily over 8-10 hours.  The product may be used in cold washing baths for cotton, rayon, hemp, flax, jute or broom fibre fabrics.  An activating agent, e.g. a soluble or insoluble manganese salt, may be added to the product for making up the bath, or may be added to the bath already containing the product, to increase the speed of oxygen development.