| abstract |
The invention relates to a process for purifying an aryl group containing carbonate, such as a diaryl carbonate, such as diphenyl carbonate, by membrane separation, wherein a membrane having an average pore size of from 0 to 10 nm is used. Further, the invention relates to a process for making a polycarbonate, comprising reacting a dihydroxy aromatic compound, for example bisphenol A, with a diaryl carbonate purified in accordance with the former process. |