B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 20/20 (2006.01) B01D 53/54 (2006.01) B01D 53/86 (2006.01) C01B 31/10 (2006.01) C01B 31/12 (2006.01)
Patent
CA 2301697
The filtration of hydrogen cyanide from an atmosphere is accomplished, according to this invention, by a filter comprising activated carbon containing at least one of copper, cobalt and silver to between 3 and 18 % in total by weight, when the filter material has been prepared from an ion exchange material in the form of a sodium salt carboxymethyl cellulose. The metal is then incorporated into the carbon by an ion exchange reaction of the cellulose with a suitable salt of the metals concerned. The activation which then follows may be supplemented by a secondary oxidation. Where the suppression of cyanogen generation is also required the carbon may also be arranged to contain chromium, with copper, chromium and silver having been found particularly effective.
L'invention porte sur un moyen de filtrage du cyanure d'hydrogène de l'atmosphère comprenant un filtre au charbon actif comportant au moins entre 3 et 18 % de son poids total de cuivre, de cobalt et d'argent, le matériau de filtrage ayant été préparé à partir d'un matériau échangeur d'ions sous forme de carbométhyl cellulose d'un sel de sodium. Le métal est ensuite incorporé au carbone par une réaction d'échange d'ions de la cellulose avec un sel approprié du métal concerné. L'activation résultante peut être suivie par une oxydation secondaire. Lorsqu'on souhaite également supprimer la production de cyanogène, le carbone peut également contenir du chrome, l'association cuivre, chrome et argent s'étant montrée particulièrement efficace.
Barnes Philip Andrew
Chinn Matthew Joseph
Dawson Elizabeth Anne
Norman Paul Roderick
Fetherstonhaugh & Co.
The Secretary Of State For Defence In Her Britannic Majesty's Go
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