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A method for the separation of a feed gas mixture comprising oxygen and nitrogen in which an oxidant gas and fuel are combusted in a combustion engine to generate shaft work and a hot exhaust gas, the feed gas mixture comprising oxygen and nitrogen is compressed, and the resulting compressed feed ga

A method for the separation of a feed gas mixture comprising oxygen and nitrogen in which an oxidant gas and fuel are combusted in a combustion engine to generate shaft work and a hot exhaust gas, the feed gas mixture comprising oxygen and nitrogen is compressed, and the resulting compressed feed gas mixture is separated into two or more product gas streams with differing compositions. The shaft work of the combustion engine is utilized to provide at least a portion of the work required for compressing the feed gas mixture, one of the product gas streams by is heated by indirect heat exchange with the hot exhaust gas from the combustion engine, and the resulting heated product gas is work expanded to generate shaft work and yield an expanded product gas stream. The combustion engine may be a gas turbine combustion engine.

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[ What is claimed is:] [1.]1. A method for the separation of a feed gas mixture comprising oxygen and nitrogen, which method comprises:(a) compressing a first gas mixture comprising oxygen to yield a compressed oxidant gas and combusting the compressed oxidant gas and fuel in a combustion engine to

[ What is claimed is:] [1.]1. A method for the separation of a feed gas mixture comprising oxygen and nitrogen, which method comprises:(a) compressing a first gas mixture comprising oxygen to yield a compressed oxidant gas and combusting the compressed oxidant gas and fuel in a combustion engine to generate shaft work and a hot exhaust gas;(b) compressing a second gas mixture comprising oxygen and nitrogen to yield a compressed feed gas mixture, and separating the compressed feed gas mixture into two or more product gas streams with differing compositions;(c) utilizing the shaft work of (a) to provide at least a portion of the work required for compressing the second gas mixture of (b); and(d) heating one of the product gas streams by indirect heat exchange with the hot exhaust gas and work expanding the resulting heated product gas stream to generate shaft work and yield an expanded product gas stream.