Patent GB-423462-A (GB)
Title: Disinfectants and plant protectives and process of producing them
IPC: A01N59/00
Filed: 1933-12-07
Abstract: Disinfectant and insecticidal mixtures, stated to liberate formaldehyde when dissolved in water, consist of a soluble persulphate and a soluble sulphocyanide with or without other reducing agents such as hexamethylene tetramine.  The reaction may be accelerated by the addition of catalysts, such as iron salts or oxides, or of substances, such as magnesium carbonate or anhydrous magnesium sulphate, which liberate heat on solution in water or by chemical reaction.  Examples relate to mixtures of (1) ammonium persulphate, hexamethylene tetramine, magnesium carbonate, anhydrous magnesium sulphate and sodium sulphocyanide, with or without ferric sulphate; (2) ammonium persulphate, sodium tetrathionate, sodium sulphocyanide and ferrous sulphate; (3) ammonium persulphate, formaldehyde-sodium hyposulphite (Na2S2O4.2CH2O), ammonium sulphocyanide and ferrous sulphate.  The dry mixtures are preferably first dissolved in a small quantity of water and then further diluted. Reference is made to mixtures containing only ammonium persulphate and hexamethylene tetramine with or without magnesium carbonate or a mixture of carbonate and sulphate.ALSO:Disinfectant and insecticidal mixtures, stated to liberate hydrocyanic acid when dissolved in water, consists of a soluble persulphate and a soluble sulphocyanide with or without other reducing agents such as hexamethylene tetramine.  The reaction may be accelerated by the addition of catalysts, such as iron salts or oxides, or of substances which liberate heat on solution in water or by reaction with the other ingredients.  Examples relate to mixtures of (1) ammonium persulphate, hexamethylene tetramine, magnesium carbonate, anhydrous magnesium sulphate and sodium sulphocyanide, with or without ferric sulphate; (2) ammonium persulphate, sodium tetrathionate, sodium sulphocyanide and ferrous sulphate.  The dry mixtures are preferably first dissolved in a small quantity of water and then further diluted. Reference is made to mixtures of sulphocyanides with acid salts, such as alkaline bisulphate.ALSO:Disinfectants, insecticides, and fungicides consist of mixtures of persulphates with sulphocyanides, and with or without other reducing agents such as hexamethylene tetramine.  These are stated to react when dissolved in water to produce sulphocyanic acid, formaldehyde and hydrocyanic acid.  The reaction may be accelerated by the addition of catalysts, such as iron salts or oxides, or of substances such as anhydrous magnesium sulphate or magnesium carbonate which liberate heat on solution in water or by reaction with the other ingredients.  The generation of hydrocyanic acid may be prevented by the inclusion in the mixtures of an additional reducing agent such as an alkaline bisulphite. Examples relate to mixtures of (1) ammonium persulphate, hexamethylene tetramine, magnesium carbonate, anhydrous magnesium sulphate and sodium rhodanide, with or without ferric sulphate; (2) ammonium persulphate, sodium tetrathionate, sodium rhodanide and ferrous sulphate; (3) ammonium persulphate, formaldehyde-sodium hyposulphite, ammonium rhodanide and ferrous sulphate.  Other soluble persulphates and rhodanides may be used and sulphites and hydrosulphites may be added.  The dry mixtures are preferably first dissolved in a small quantity of water and then further diluted. Solutions of low pH are stated to be obtained, but less acid solutions may be obtained by adding sodium phenolate, or salts of aromatic sulpho acids.  Reference is made to mixtures of sulphocyanides with acid salts such as alkaline bisulphate, and to mixtures of ammonium persulphate with hexamethylene, with or without magnesium carbonate or a mixture of carbonate and sulphate.  The Specification, as open to inspection under Sect. 91, relates also to mixtures of persulphates with reducing agents in general. This subject-matter does not appear in the Specification as accepted.