CLC process and installation with the production of high purity nitrogen

A process for the combustion of a hydrocarbon feed by chemical looping combustion, in which a redox active mass in the form of particles circulates between at least one reduction zone and two oxidation zones operating in fluidized bed mode, in which:

• (a) combustion of the hydrocarbon feed is carried out by reduction of the redox active mass brought into contact with the feed in at least one reduction zone;
• (b) in a first oxidation zone, a first step for oxidation of the reduced redox active mass obtained at the end of step (a) is carried out by being brought into contact with a first fraction of a stream of air depleted in oxygen, in order to produce a stream of dinitrogen comprising a quantity of 100 ppmv or less of dioxygen and a stream of partially re-oxidized redox active mass;
• (c) in a second oxidation zone, a second step for oxidation of the stream of partially re-oxidized redox active mass obtained at the end of step (b) is carried out, by being brought into contact with air in order to produce the stream of air depleted in oxygen and the stream of re-oxidized redox active mass for use in step (a);
• (d) the stream of air depleted in oxygen obtained at the end of step (c) is divided in order to form the first fraction of the stream of air depleted in oxygen used in step (b) and a second fraction of the stream of air depleted in oxygen which is extracted from the chemical loop.