METHOD OF LOW-TEMPERATURE GAS SEPARATION Russian patent published in 2006 - IPC F25J3/02 

FIELD: separation of gases or gaseous mixtures.

SUBSTANCE: method comprises cooling mixture, expanding mixture or its portion, partial condensing of the mixture with its simultaneous expansion, and separating the mixture or its portion in the rectifying tower to produce liquid and gas phases. The expansion is performed by flowing the mixture through the nozzle passage. The nozzle passage swirls the flow of the mixture. The mixture flow is separated at the outlet of the nozzle passage at least into two flows. One of the flow is enriched by the components denser than methane, and the other one is depleted by these component. The enriched flow is directed to the rectifying tower. The gas products produced in the rectifying tower are directed to the mixture upstream of its expansion. According to the second version, the gas products are mixed completely or in part with the depleted flow. According to the third version, the enriched flow is directed completely or in part to the mixture upstream of its expansion. According to the fourth version, the enriched flow and gas products are directed in part or completely to the mixture upstream of its expansion.

EFFECT: enhanced efficiency.

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