| 摘要 |
The invention relates to a method for producing chlorine from hydrogen chloride, comprising the following steps: a) making a liquid hydrogen chloride flow a available as a refrigerant flow; b) feeding at least one flow b1 that contains hydrogen chloride and a flow b2 that contains oxygen to a hydrogen chloride oxidation zone and catalytically oxidizing hydrogen chloride to chlorine, a product gas flow b3 being obtained that contains chlorine, water, oxygen, carbon dioxide and inert gases; c) contacting the product gas flow b3 with aqueous hydrochloric acid I in a phase contact unit and partially removing water and hydrogen chloride from flow b3, a gas flow c being obtained that contains hydrogen chloride, chlorine, water, oxygen, carbon dioxide and optionally inert gases; d) drying the gas flow c, a substantially water-free gas flow d remaining that contains hydrogen chloride, chlorine, oxygen, carbon dioxide and optionally inert gases; e) partially liquefying the gas flow d by compression and cooling, an at least partially liquefied flow e being obtained; f) performing a gas-liquid separation of flow e to give a gas flow f1 that contains chlorine, oxygen, carbon dioxide, hydrogen chloride and optionally inert gases and a liquid flow f2 that contains hydrogen chloride, chlorine, oxygen and carbon dioxide, and optionally returning at least part of gas flow f1 to step b); g) separating liquid flow f2 by distillation in a column to give a chlorine flow g1 and a flow g2 that substantially consists of hydrogen chloride, oxygen and carbon dioxide; the cooling and partial liquefaction of gas flow d in step e) being the result of indirect heat exchange with the liquid hydrogen chloride flow a, at least a part of the liquid hydrogen chloride flow a being evaporated and this part being obtained as gaseous hydrogen chloride flow a'. |
