Patent GB-394989-A (GB)
Title: Process for the production of organic persulpho compounds
IPC: C07C409/44
Filed: 1931-11-27
Abstract: Organic derivatives of persulphuric acid of the type R-SO2-O-O-Me, where R is an organic radical and Me a basic radical, e.g. a metal, are prepared by the oxidation of aliphatic, aromatic, hydro-aromatic, and heterocyclic sulphochlorides with peroxides such as sodium peroxide, in the presence of organic solvents and in substantial absence of water.  Good cooling is necessary.  The stabilizers used for hydrogen peroxide and in the preparation of peroxides and per-salts may be added before or during the reaction or to the finished product.  In the presence of water, in which they are soluble, the products slowly give off active oxygen.  In the examples: (1) toluene sulphochloride in benzene is added to a suspension of sodium peroxide in alcohol, while cooling intensively with brine.  The temperature is slowly raised to 10 DEG  C. and held there until the whole of the peroxide is converted; the solvent is then separated.  (2) Sodium peroxide in methyl alcohol is treated with naphthalene sulphochloride in benzene.  (3) Sodium peroxide in alcohol is treated with stearic acid sulphochloride.  (4) Calcium peroxide suspended in alcohol is treated with a benzene solution of amyl naphthalene sulpho-chloride.  The calcium salt is obtained in flocculent form by dilution with water containing a small amount of size.  These organic persulpho-compounds have oxidizing, bleaching, emulsifying, wetting, disinfectant and insecticidal actions.  The persulphonic compounds can be employed alone or in combination with other per-compounds such as hydrogen peroxide and perborates. In particular, (a) persulpho compounds of higher aliphatic hydrocarbons and their derivatives are very effective as wetting and emulsifying agents.  Thus in the degumming of raw silk a solution of 10 grams of sodium octadecyl persulphonate per litre of liquor may be employed. Soap and like materials, and also water-glass for stabilizing, may be added to the degumming bath. (b) Aromatic and hydroaromatic persulphonic acids and their salts, particularly those having an alkyl-aryl or aralkyl group on the side chain, show a very good bleaching and oxidizing action and high wetting power.  Thus unbleached, starch-sized cotton fabric may be desized and semi-bleached by treatment in a bath containing 3 grams of sodium di-amyl naphthalene persulphonate, and 3 grams of calcined soda per litre, together with a small amount of a magnesium salt as stabilizer.  The bath is heated at 90 DEG  C. for an hour, and then left overnight.  In the treatment of raw cotton, it is boiled under pressure in a bucking liquor of 2 DEG  B<\>ae with the addition of 5 grams of sodium benzyl naphthalene persulphonate and 0,5 grams of sodium pyrophosphate per litre. A soap powder for use in domestic washing consists of 40 per cent of sodium tetrahydronaphthalene persulphonate, 50 per cent of powdered curd soap and 10 per cent of tertiary sodium phosphate. For bactericidal and disinfecting purposes, bodies derived from phenols or their halogen derivatives, e.g. chlorinated cresols, such as a mixture of orthochlor metacresol and orthochlorparacresol, are particularly useful.  The Specification as open to inspection under Sect. 91 refers to the use of other organic sulpho-compounds as starting material. This subject-matter does not appear in the Specification as accepted.ALSO:Organic persulphonates of the type R-SO2-O-O-Me, where R is an organic radical and Me a basic radical, e.g. a metal, may be used as emulsifying agents or in cleaning fabrics.  The persulphonate may be used in a bath with, for example, calcined soda or soap, and waterglass, a magnesium salt, or sodium pyrophosphate as stabilizer. A soap powder for use in domestic washing consists of 40 per cent of sodium tetrahydronaphthalene persulphonate, 50 per cent of powdered curd soap and 10 per cent of tertiary sodium phosphate.  Cleansing compositions containing soap and an aliphatic, aromatic, hydro-aromatic, or heterocyclic persulpho-compound are described. The persulphonic compounds may also be employed in combination with other per-compounds such as hydrogen peroxide and perborates.ALSO:Organic persulphonates of the type R-SO2-O-O-Me, where R is an organic radicle and Me a basic radicle, e.g. a metal, may be used as disinfectants or insecticides, and may be used in combination with other per-compounds, such as peroxides or perborates.  Particularly useful for these purposes are the substances derived from halogenated phenols, e.g. a mixture of orthochlormetacresol and orthochlorparacresol.