GB316222A - Improvements in or relating to the activation of carbonaceous substances by means of gases - Google Patents

Abstract

316,222. Soc. de Recherches et d'Exploitations PetrolifÞres. July 25, 1928, [Convention date]. Carbon.-In retorts for gas activation, by gaseous exchange through the walls, of carbonaceous material, walls perforated with orifices of cir. cular, lamellate or other shape of very small diameter or depth, e.g. several millimetres, sufficiently narrow to prevent convection gas currents and inclined so as to exclude carbonaceous material and ashes are employed. The walls may have recesses or undercuts C<1>, Fig. 6. on their inner sides, the perforations 0 opening into the re. cesses at zones clear of the carbonaceous material 1 and ashes. The retorts may be of tubular shape and of cylindrical, elliptical or polygonal transverse section. Retorts of parallelopiped shape, the height and length of which are for example several metres and the spacing apart of the side several centimetres, may also be used. The retorts are placed side by side, vertically or obliquely, in furnaces or ovens, the carbonaceous materials to be activated being arranged in the retorts, Around the outer walls of the (retorts activating gases are circulated at high temperature, with which heating gases may be mixed, an interval of some centimetres being provided between the walls of the adjacent retorts. In a modification, the material may be disposed outside and the gases circulated through the retorts, the direction of inclination of the perforations being changed. The retorts may be continuously or discontinuously worked; charging hoppers each of which serves for each or several of the chambers are disposed at the top. The activated material passes at the bottom through gratings into one or more closed vessels, from which air is excluded, where it is cooled. The material may be raw or partly or wholly carbonized and may be agglomerated. It may be given a prior impregnation treatment to improve the activating action of the gases. Substances of high ash content may be used. A mixture of carbon dioxide and steam may be used as activating gas. Specification 269,477 is referred to.