Process for producing diaryl carbonate and process for treating alkali chloride solution resulting therefrom

摘要

Producing diaryl carbonates comprises producing phosgene by reacting chlorine with carbon monoxide; reacting the phosgene with a monophenol in the presence of a base to form a diaryl carbonate and an alkali metal chloride solution (S1); separating and working up the diaryl carbonate; treating S1 to remove solvent residues, adjusting it to a pH of 8 or less and treating it with an adsorbent; electrochemically oxidizing S1 to form chlorine and alkali liquor; and recycling the chlorine to the phosgene production step and/or recycling the alkali liiquor to the diaryl carbonate production step.