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PROCESS FOR THE PRODUCTION OF DIARYL CARBONATES AND TREATMENT OF ALKALICHLORIDE SOLUTIONS RESULTING THEREFROM

  • US 20080053836A1
  • Filed: 09/04/2007
  • Published: 03/06/2008
  • Est. Priority Date: 09/02/2006
  • Status: Abandoned Application
First Claim
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1. A process comprising:

  • (a) reacting phosgene and a monohydroxyl aryl compound in the presence of a suitable catalyst to form a diaryl carbonate and a solution comprising an alkali chloride;

    (b) separating the diaryl carbonate from the solution;

    (c) adjusting the pH of the solution to a value of less than or equal to 8 to form a pH-adjusted solution;

    (d) treating the pH-adjusted solution with an adsorbent to form a treated solution;

    (e) subjecting at least a portion of the treated solution to electrochemical oxidation to form chlorine and an alkali hydroxide solution; and

    (f) recycling at least a portion of one or both of the chlorine and the alkali hydroxide solution.

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