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James Yate Johnson
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7592. Johnson, J. Y., [Badische Anilin & Soda Fabrik]. April 10. Formaldehyde sulphoxylates, described in Specification No. 13,955, A.D. 1904, and applicable as discharging-agents, are prepared either by treating the zinc or ammonium salts of formaldehyde sulphurous acid, formaldehyde hyposulphurous (hydrosulphurous) acid, or the free acids with zinc, iron, or other metal having a reducing action, or by the interaction of formaldehyde, zinc or other reducing-metal, and a bisulphite or hyposulphite (hydrosulphite), or by passing sulphur dioxide into a suspension of zinc &c. in formaldehyde, free from extraneous acid. The zinc salt of formaldehyde sulphoxylic acid, which is produced when zinc is employed, can be used as a discharging-agent or may be converted by alkali or alkali salts into the known alkali salts. The formaldehyde zinc hyposulphite (hydrosulphite) obtained according to Specification No. 5867, A.D. 1903, can also be converted into formaldehyde zinc sulphoxylate by boiling with zinc dust &c.
GB190507592D1905-04-101905-04-10Improvements in the Manufacture and Production of Discharging Agents
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