GB228812A - Improvements in the manufacture of decolourising carbon - Google Patents

Abstract

228,812. Potts, H. E., (Algemeene Norit Maatschappij). Aug. 9, 1923. Carbon and charcoal.-Active carbon is produced by subjecting carbonaceous material, for example wood or fruit pips, to the action of activating gases while freely moving in close proximity to heat-radiating surfaces supplementary to the ordinary walls of the retort. The use of rotary retorts is excluded. The heat radiating surfaces may consist of baflle rods, which, the Provisional Specifications state, may be transversely disposed in staggered horizontal layers and may be composed of silica, fireclay or magnesia heated to the activation temperature, or may be hollow and internally heated. In the apparatus illustrated, the heat radiating surfaces consist of a number of superimposed hollow rhomboids 22 heated by flue pipes 25 and disposed within an activating chamber 20 provided with inlets 26, 26<1> for activating gas and inlets 27, 27<1> for the combustible gas mixture for internal heating. The raw material fed from a hopper 21 is forced to move in thin layers past the rhomboids by the provision of baffles 23, 28 and is finally discharged into the chamber 24. The gases are drawn off by an exhauster 30 through a conduit 29 and dust collector 31. The nature of the raw material, which should be finely divided, the temperature and the quantity, quality and velocity of the gases may be adjusted so as to yield novel products of very high activity, which according to the Provisional Specifications may be used for catalytic reactions, gas absorption, and for the purification and sterilization of sugar juices, water, oils such as linseed and soya bean oils, fats and other liquids, and may be easily regenerated by burning or treatment with acids, alkalies &c. in tne Provisional Specifications peat and predistilled material such as charcoal and peat coke are described as suitable initial materials, steam, carbon dioxide, air, producer gas, water gas, Mond gas, chlorine, sulphur dioxide, volatile chlorides, ammonia &c. as suitable activating gases and lumps of quartz and the like as heat radiating surfaces. Specification 228,582 is referred to.