GB589124A - Process for producing mixtures of difficultly liquefiable gases under pressure - Google Patents

Abstract

589,124. Separating gases by liquefaction; mixing gases. SOC. L'AIR LIQUIDE, SOC. ANON. POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES G. CLAUDE. Nov. 23, 1939, No. 30676. Convention date, July 19, 1939. [Class 8 (ii)] Hydrogen or other gas is separated by liquefaction from coke oven gas or other gaseous mixture and mixed with a second cooled gas, e.g., nitrogen, the less volatile gas being taken in the liquid state and in such quantity and at such low temperature that the mixture thus obtained is not wholly vaporized: the mixture cools the gases to be cooled, e.g., the coke oven gas. A cooling section of a rectifying column comprises vertical pipes S, surmounts a washing section P and leads to a second washing section A. Gas from this top section is mixed with liquid nitrogen and passed round the pipes S as washing liquid after having cooled another portion of liquid nitrogen in a heat exchanger M and having been subsequently led through an expansion valve R and a pipe K. The nitrogen is liquefied by cooling compressed nitrogen by separation products, e.g., the liquid mixture of carbon monoxide and nitrogen or the gaseous mixture of nitrogen and hydrogen, the latter mixture being first warmed. The process may be used to obtain a mixture of hydrogen and carbon monoxide. The Specification as open to inspection under Sect. 91 describes a construction in which gas rising from the top of a rectification column A, Fig. 1 (Cancelled) treating coke oven gas flows to a cooled nest of Field tubes C, condensate formed flowing back to the column while the gaseous nitrogen-hydrogen mixture is led to an expansion motor F and afterwards mixed with liquid nitrogen from an expansion valve T, the mixture flowing around the Field tubes to an outlet H. This subject-matter does not appear in the Specification as accepted.