A method for producing chlorine

The following steps, Stream a1 comprising: a) hydrogen chloride, and the flow a2 comprising oxygen, is supplied to the oxidation region, and, by the catalytic action by oxidizing hydrogen chloride and chlorine, chlorine, water, oxygen, carbon dioxide, and inert gases obtaining a stream a3 comprising, b) the product gas stream 3 is cooled, and the hydrogen chloride and water is removed as a water-containing hydrochloride, leaving chlorine, water, oxygen, a gas stream b comprising carbon dioxide and an inert gas process, and c) optionally drying the gas stream b), substantially free of water and leaving the chlorine, oxygen, a gas stream c comprising carbon dioxide and an inert gas process, d) the gas stream c and chlorine, oxygen, and chlorine-rich recycle stream f1 comprising carbon dioxide, by cooling the pressure, at least partially liquefied, to obtain a flow d which is at least partially liquefied, The e) flow d, chlorine, oxygen, carbon dioxide, and a gas stream e1 comprising an inert gas, chlorine, oxygen, and the step of the gas / liquid separator to a liquid stream e2, comprising carbon dioxide, f) supplied to the membrane separation unit at least a portion of the gas stream e1, and fractionated by membrane separation, a chlorine-enriched recycle stream f1, chlorine, oxygen, and includes carbon dioxide, chlorine content low gas flow give and f2, and the step of recycling the chlorine-rich recycle stream f1 to step d), The g) liquid stream e2, by distillation, separating the chlorine stream g1, the flow g2 which comprises essentially oxygen and carbon dioxide, Process for producing chlorine from hydrogen chloride, which comprises a. .FIELD 1