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AssigneeMax-Planck-Gesellschaft zur Forderung der Wissenschaften e.V.
InventorsSimon Bechtel, Tanja Vidakovic-Koch, Kai Sundmacher
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The invention relates to a method for separating chlorine from a gaseous anode outlet stream mass flow of an electrochemical cell reactor. In a first aspect, the method makes use of an absorption step, wherein an anode outlet stream mass flow of the electrochemical cell reactor is exposed to an organic solvent being essentially immiscible with water for achieving an exergy-efficient separation of chlorine and hydrogen chloride. In a further aspect, the method makes use of absorption step, wherein the anode outlet stream mass flow is exposed to an ionic liquid, wherein the hydrogen chloride is dissolved in said ionic liquid, thereby forming a gas flow containing essentially chlorine and a solution mass flow comprising the ionic liquid and the hydrogen chloride. The hydrogen chloride is desorbed from the solution mass flow in a desorption step. In another aspect, the method makes use of a distillation step, wherein the anode outlet stream mass flow is separated at a static pressure of at least 2 bar for an exergy-efficient separation.
A method for separating chlorine from a gaseous anode outlet stream mass flow of an electrochemical cell reactor, said anode outlet stream mass flow essentially comprising chlorine and anhydrous hydrogen chloride, comprising the following steps:
A method for separating chlorine from a gaseous anode outlet stream mass flow of an electrochemical cell reactor, said anode outlet stream mass flow essentially comprising chlorine and anhydrous hydrogen chloride, comprising the following steps:
A method for separating chlorine from a gaseous anode outlet stream mass flow of an electrochemical cell reactor, said anode outlet stream mass flow essentially comprising chlorine and anhydrous hydrogen chloride, said method comprising a distillation step, wherein the anode outlet stream mass flow is separated at a static pressure of at least 2 bar, thereby forming an overhead product mass flow comprising the gaseous hydrogen chloride and a bottom product mass flow comprising the chlorine, whereby the separated hydrogen chloride is at least partially recycled to the inlet of the anode of the electrochemical all reactor and wherein the condenser temperature in the distillation column used in the distillation step is above 195 K, and whereby the separated hydrogen chloride is at least partly converted into a concentrated hydrochloric acid.
Dependencies are inferred from the claim text.