Journal . cid Gas fur theProduction of Chlorine Gas. W. Donald, Pat. 62, Jan. 3, 1SS7. Sd. The object of this invention is to obtain chlorine fromhydrochloric acid and to recover the by-products formedduring the process. Hydrochloric acid gas, dried bypassing through a vessel charged with concentratedsulphuric acid, is passed into a vessel containing a mix-ture of strong nitric and sulphuric acids, where it under-goes decomposition according to the following equation :2HC1+ = - NcO, + CI,. The sul-phuric acid present absorbs the water formed by thereaction and thus pre
Journal . cid Gas fur theProduction of Chlorine Gas. W. Donald, Pat. 62, Jan. 3, 1SS7. Sd. The object of this invention is to obtain chlorine fromhydrochloric acid and to recover the by-products formedduring the process. Hydrochloric acid gas, dried bypassing through a vessel charged with concentratedsulphuric acid, is passed into a vessel containing a mix-ture of strong nitric and sulphuric acids, where it under-goes decomposition according to the following equation :2HC1+ = - NcO, + CI,. The sul-phuric acid present absorbs the water formed by thereaction and thus prevents an unnecessary dilution ofthe nitric acid. The decomposing vessel ought to bekept at a temperature of o C, while the escaping gasesshould not be warmer than 30° C. These latter thentravel through a scries of vessels containing dilute nitricacid, whereby nearly the whole of the oxides of nitrogenbecome absorbed, while the last remaining traces arearrested by pissing thronjh a sulphuric acid Fie 2 outside, whereas D and D- are cooled by refrigeratedbrine. The liquor from A- and A is run into D, whereit is heated while a slow current of air is passedthrough, the lower oxides of nitrogen being thus oxidisedinto nitric acid. From D the air passes through atower F, carrying with it free oxides of nitrogenwhich during their progress undergo further oxidation,the necessary water being supplied to the tower. Thecondensed gases flow back into ]), while those uncon-densed pass into D , which is charged with nitricacid, and are ultimately scrubbed in D- withsulphuric acid. The oxidation of the gases is alsoassisted by compounds rich in oxygen, such as man-ganese peroxide, manganese nitrate, and so forth. Therecovered acids are again used for the process.—S. II, Iin/noci incuts in the Production of Sulphide of Zinc andChloride of Ammonium. H. Kenyon, Fat, , Dec. 9, 188G. 6d. In the galvanising of iron, zinc waste is obtained con-taining zinc, iron,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
