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A method and an apparatus for separating chlorine gas from a gaseous anode outlet stream of an electrochemical reactor
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A battery reactor, electrochemical technology, applied in the direction of chemical instruments and methods, separation methods, specific gas purification/separation, etc., can solve the problem of high investment cost, and achieve the effect of low investment cost and reduced loss
Active Publication Date: 2020-08-21
MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
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Embodiment 1
[0098] For this example of a process involving an absorption step with an organic solvent, n-octane was chosen as the organic solvent. This example involves figure 1 setting. according to figure 1 The stream of process flow diagram in is as follows, it uses O 2 As cathode inlet gas:
[0125] For this example of a process involving an absorption step utilizing an ionic liquid, diethyl-methylsulfonium methanesulfonate ([S221][MeSO3]) was chosen as the ionic liquid. This example involves image 3 setting. according to image 3 The most important streams of the process flow diagram are as follows:
[0153] This example involves figure 2 setting. For processes involving a distillation step, distillation is performed at 1 atmosphere pressure. according to figure 2 The most important streams in the process flow diagram are as follows:
[0154] Bottom product mass stream 33 withdrawn from distillation column 32:
[0156] Top product mass stream 35 withdrawn from distillation column 32:
[0157]
[0158]
[0159] Concentrated aqueous hydrogen chloride mass stream 40 withdrawn from distillation column 32:
[0160] total Cl 2
HCl h 2 o
h 3 o +
Cl -
Molar ...
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Abstract
The invention relates to a method for separating chlorine from a gaseous anode out- let streammass flow of an electrochemical cell reactor. In a first aspect, the method makes use of an absorption step, wherein an anode outlet streammass 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 hydrogenchloride. In a further aspect, the method makes use of absorption step, wherein the anode outlet streammass flow is exposed to an ionic liquid, wherein the hydrogenchloride 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 hydrogenchloride. 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 ofat least 2 bar for an exergy-efficient separation.
Description
technical field [0001] The present invention relates to a method for the separation of chlorine gas from a gaseous anode outlet stream mass flow of an electrochemical cell reactor. In a first aspect, the method utilizes an absorption step wherein the anode outlet stream mass flow of the electrochemical cell reactor is exposed to an organic solvent for the removal of chlorine and hydrogen chloride by dissolving the chlorine in the organic solvent. Benefit (exergy efficient) separation. In another aspect, the process utilizes an absorption step wherein the anode outlet stream mass flow is exposed to an ionic liquid, wherein hydrogen chloride is dissolved in said ionic liquid, thereby forming a gas stream substantially comprising chlorine and comprising the ionic liquid and hydrogen chloride solution mass flow. Hydrogen chloride is desorbed from the solution mass flow in the desorption step. In another aspect, the method utilizes a distillation step wherein the anode outlet s...
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