Abstract: In a method for regulating a device for separating air by cryogenic distillation, during the change from a low-flow mode to a high-flow mode, two flow rates of reflux sent to the low-pressure column of a double column are increased more rapidly than the flow rate of gaseous air sent to the medium-pressure column of the double column in order to ensure the stability of the oxygen content in the argon bulge of the low-pressure column during the mode change.

Abstract: Apparatus for separating air comprising a device for breaking up a jet of cryogenic liquid in a gas flow, comprising a supply pipeline for the cryogenic liquid having an inside diameter greater than or equal to 10 mm, and a gas pipe of circular section, with a diameter d, the gas pipe comprising a portion having a reduction in diameter by a ratio of 20 to 50% at the point of injection of liquid and over a distance y wherein: y=n×d and wherein the supply pipeline penetrates the gas pipe such that its end is in the portion of the pipe having the reduction in diameter and n is between 7 and 9.