Method for preparing chlorine gas through catalytic oxidation of hydrogen chloride

A method for preparing chlorine gas, comprising

• providing a first reactor and one or more downstream reactors, each of the reactors being filled with a catalyst and connected in series or in parallel;
• providing a gas stream containing hydrogen chloride and a gas stream containing oxygen to the first reactor, and providing a gas stream containing hydrogen chloride, a gas stream containing oxygen, or both, to the downstream reactors, and allowing the oxygen in the gas streams for catalytic oxidation of the hydrogen chloride in the gas streams to obtain a product gas stream;
• directly returning a part of the product gas stream from the last reactor of the reactors to any of the first or the one or more other reactors without separation of product;
• and
• separating a remainder of the product gas stream from the last reactor of the reactors to obtain chlorine gas.