Integrated Process for Co-Production of Carboxylic Acids and Halogen Products from Carbon Dioxide
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United States of America Patent
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Jul 14, 2014
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Jun 19, 2014
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The present disclosure is a method and system for production of carboxylic based chemicals. A method for producing at oxalic acid may include receiving an anolyte feed at an anolyte region of an electrochemical cell including an anode and receiving a catholyte feed including carbon dioxide and an alkali metal bicarbonate at a catholyte region of the electrochemical cell including a cathode. Method may include applying an electrical potential between the anode and cathode sufficient to reduce the carbon dioxide to at least one reduction product and converting the at least one reduction product and an alkali metal hydroxide to an alkali metal oxalate via a thermal reactor. The method may further include converting the alkali metal oxalate to oxalic acid at the electrochemical acidification electrolyzer. The method may further include the co-production of halogen products from the anolyte region of the electrochemical cell, by the oxidation of hydrogen halides used as an anolyte feed. The halogen may then be further reacted with other chemicals to produce chlorinated organics as well as inorganic compounds such as sodium hypochlorite.
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