| abstract |
The present invention relates to a process comprising purifying dialkyl carbonates of the formula (II) in one or more columns in the presence of an alkylene oxide of the formula (V) and of an alkyl alcohol of the formula (IV) n n n n n n n n n n wherein R 1 and R 2 represent, independently of one another, linear or branched, substituted or unsubstituted C 1 -C 6 -alkyl, R 3 and R 4 represent, independently of one another, hydrogen, substituted or unsubstituted C 1 -C 4 -alkyl, substituted or unsubstituted C 2 -C 4 -alkenyl or substituted or unsubstituted C 6 -C 12 -aryl, and R 5 represents a straight-chain or branched C 1 -C 4 -alkyl; and wherein the mean residence time of the dialkyl carbonate in the column(s) is from 0.3 h to 3 h. |