GB316870A - Improvements in or relating to the activation of carbonaceous substances by means of gases - Google Patents

Abstract

316,870. Soc. de Recherches et d'Exploitations PetrolifÞres. Aug. 4, 1928, [Convention date]. Carbon.-To prevent incrustation of the porous refractory walls of retorts used in the gas activation of carbonaceous material by contact of the ashes therewith, the faces of the walls in contact with the material 1 are formed with projecting angles b and undercut recesses c or with undulations or other similar means whereby contact between the walls and the material is diminished while the total diffusing surface is increased. The retorts may be tubular and of circular, elliptical, polygonal or other cross-section, and may be disposed vertically or almost so in furnaces through which high temperature activating gases, with which heating gases may be mixed, are circulated externally of the retorts. In another form, the retorts are of parallelopiped shape, for example some metres in height and having their lateral walls several centimetres apart. The retorts are disposed side by side and are separated by an interval of some centimetres to provide for the circulation of the activating gases. In a further form, the material to be activated fills the furnace, porous refractory tubes through which the activating gases are circulated being arranged vertically in the furnace, the faces in contact with the material being formed with angles and recesses as before. Continuous or discontinuous working may be employed in the process. The furnaces may have one or more charging hoppers at the top and a grating or obturator at the bottom through which the material is discharged into one or more closed vessels, air being excluded therefrom during the cooling of the carbon. The material to be treated may be raw or partly or wholly carbonized and may be impregnated to improve the activating effect of the gases. Materials of high ash content can be used.