Abstract: A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described.
April 13, 2010
Date of Patent:
November 11, 2014
Bayer MaerialScience AG
Pieter Ooms, Andreas Bulan, Johann Rechner, Rainer Weber, Michael Traving, Marc Buts, Johan Vanden Eynde