Patent GB-286291-A (GB)
Title: Process and apparatus for producing hydrogen mixed with carbon monoxide and nitrogen from coke oven gas
IPC: C01B3/02
Filed: 1928-01-23
Abstract: 286,291. Compagnie Nationale de MatiÞres Colorantes et Manufactures de Produits Chimiques du Nord Reunies Etablissements Kuhlmann. March 3, 1927, [Convention date]. Producers.-Coke-oven gas is passed into a chamber filled with coke or other material of considerable heat-capacity, and is there maintained at a temperature not less than 1200‹ C. for sufficient time say 1 second, for practically complete decomposition of the heavy hydrocarbons and for the reduction of the methane content below 1 per cent, the waste heat of the issuing gases being employed to preheat the gas entering the chamber. The carbon depositobtained may be burned to maintain the heat. The coke oven gas, after the usual purification, is supplied through pipe 14 to a heat recuperator 4 from which it passes through a chamber 6 and passage 8 to the reaction chamber 2, which is filled with coke, leaving through passage 9, chamber 7. heat recuperator 5, and pipe 15. In the second stage, the apparatus is scoured out with an inert gas, for example combustion gases, entering and leaving as before through pipes 14, 15 respectively. The carbon dioxide in the gasesforms, in chamber 2, carbon monoxide which isburned in chamber 7, air being supplied through nozzle 12. Air is next passed in through pipe 14 and nozzle 12 to burn the carbon deposited in the cracking operation, part of the combustion gases being collected and used in the scouring step. The apparatus is then scoured out again, starting from pipe 15 and ending at pipe 14, and the cycle of operations is commenced again in the reverse direction, beginning at pipe 15. The gases first obtained in the cracking step are impure and may be sent to waste. When gases. poor in methane are used, some gas or coke may be burned to keep up the heat required. Steam may be added to the gases to increase the hydrogen and carbon monoxide in the product, the heat being maintained by burning more coke or, where coke is not used for filling chamber 2, by introducing alternately the mixture of the gas to be treated and steam, and a mixture of heating gas and air. Where the gas. is to be used in the production of ammonia, air is added prior to the treatment, carbon monoxide being produced. To remove the carbon monoxide the gas may be reacted with steam to give further hydrogen and carbon dioxide. Alternatively the gaseous mixture may be purified, compressed and reacted, it may be in the presence of a suitable catalyst, to form oxygenated organic campounds, and, after further purification, can be used for the ammonia synthesis. Specifications 244,730, 266,410; 271,483, 271,491, [both in Class 90, Non-metallic elements], and 274,610 are referred to. According to the Specification as open to inspection under Sect. 91 (3) (a), gases other than coke oven gas may be treated; the coke may be impregnated with suitable substances to increase its activity; and the proportion of carbon monoxide and dioxide in the gas may be reduced before treatment. This subject-matter does not appear in the Specification as accepted.