Patent GB-194289-A (GB)
Title: Improvements in the manufacture of disinfecting fertilisers from sulphur or metallic sulphides
IPC: C05F7/02
Filed: 1923-02-27
Abstract: Sulphur dioxide and hydrogen, with or without nitrogen, are obtained by bringing steam and oxygen or air alternately or simultaneously into contact with sulphur or sulphides, the heat due to combustion aiding the decomposition of the steam.  Sulphur vapours or sulphuretted hydrogen may be caused to react with steam and oxygen or air in the presence of porous materials or catalysts such as oxides or metals of the iron group, palladium, osmium, and platinum.  The hydrogen and nitrogen obtained may be used for the synthesis of ammonia or the production of nitrogenous products which will yield ammonia.  Oxygen may be removed from the combustion gases by passing them through waste cellulose lyes or other solutions containing sulphur dioxide or sulphites and catalysts such as phenol compounds and iron salts.  Waste gases from the manufacture of sulphuric acid may be treated in the same way.  The solutions may be subsequently neutralized and used as fertilizers.  Cellulose may be treated with ammonia prior to treatment with sulphite.  The cellulose is washed after the treatment with ammonia, and sulphur dioxide is added to the wash liquor, which is then used again to treat the cellulose.  Waste cellulose liquors may be treated with ammonia and sulphur dioxide. The precipitate obtained is treated with steam and lime, baryta, or other non-volatile alkali to remove ammonia, and is applicable for tanning purposes.  The liquor may be used directly, or after evaporation, as a fertilizer or may be absorbed in other fertilizing materials, such as phosphates and calcium cyanamide, or it may be used to preserve natural organic fertilizers. Fertilizing products containing sulphates instead of sulphites may be obtained by heating the liquor under pressure with sulphur dioxide and separating the sulphur which is precipitated.  The liquors are stated to provide an efficient medium for bacterial development.  Specifications 2662/73, 26845/11, [both in Class 111, Sewage &c.], and 17384/15 are referred to.  Reference has been directed by the Comptroller to Specification 156,777, [Class 96, Paper &c.].ALSO:Sulphur dioxide and hydrogen, with or without nitrogen, are obtained by bringing steam and oxygen or air alternately or simultaneously into contact with sulphur or sulphides, the heat due to combustion aiding the decomposition of the steam.  Sulphur vapours or sulphuretted hydrogen may be caused to react with p  steam and oxygen or air in the presence of porous materials or catalysts such as oxides or metals of the iron group, palladium, osmium and platinum.  The hydrogen and nitrogen obtained may be used for the synthesis of ammonia or the production of nitrogenous products which will yield ammonia.  Oxygen may be removed from the combustion gases by passing them through waste cellulose lyes or other solutions containing sulphur dioxide or sulphites and catalysts such as phenol compounds and iron salts.  Waste gases from the manufacture of sulphuric acid may be treated in the same way. The solutions may be subsequently neutralized and used as fertilizers.  Cellulose may be treated with ammonia prior to treatment with sulphite.  The cellulose is washed after the treatment with ammonia, and sulphur dioxide is added to the wash liquor, which is then used again to treat the cellulose.  Waste cellulose liquors may be treated with ammonia and sulphur dioxide.  The precipitate obtained is treated with steam and lime, baryta, or other non-volatile alkali to remove ammonia, and is applicable for tanning purposes.  The liquid may be used directly, or after evaporation, as a fertilizer or may be absorbed in other fertilizing materials, such as phosphates and calcium cyanamide, or it may be used to preserve natural organic fertilizers.  Fertilizing products containing sulphates instead of sulphites may be obtained by heating the liquor under pressure with sulphur dioxide and separating the sulphur which is precipitated.  The liquors are stated to provide an efficient medium for bacterial development.  Specifications 2662/73, [Class 111, Sewage &c.], 26845/11, and 17384/15, [Class 111, Sewage &c.], are referred to.  Reference has been directed by the Comptroller to Specification 156,777, [Class 121, Starch &c.].