Patent ID: 9140491
Filing Date: 2015-09-22
Classification: F25J

Abstract:
1. A process for the separation of air in a system of columns by cryogenic distillation in which compressed air, purified and cooled, is separated in the system of columns in order to form an oxygen-enriched flow and a nitrogen-enriched flow, in which at least one column of the system of columns comprises an evaporator/condenser which has to ensure the evaporation of a liquid enriched in oxygen with respect to the air by means of an exchange of heat with a calorigenic fluid, the calorigenic fluid having been compressed upstream of the evaporator/condenser in a compressor having a cryogenic inlet temperature, the calorigenic fluid being at least partially condensed in the evaporator/condenser, wherein a cryogenic liquid is added to the calorigenic fluid upstream of the evaporator/condenser, wherein the cryogenic liquid is added to the calorigenic fluid downstream of the compressor.