A method for production of diaryl carbonate by reaction of a dialkyl carbonate and an aromatic alcohol in the presence of a transesterification catalyst, comprising: producing a first top stream comprising dialkyl carbonate and alkyl alcohol from a first reactive distillation column; introducing a reactant stream comprising the first top stream to a first divided wall distillation column (DWC1 200) and separating the mixture with use of the first divided wall distillation column (DWC1 200); recovering from the first reactive distillation column a first bottom stream comprising alkyl aryl carbonate; and introducing the first bottom stream into a second reactive distillation column to produce a second bottom stream comprising diaryl carbonate; recovering from the second reactive distillation column the second bottom stream comprising diaryl carbonate and alkyl aryl carbonate, and a second top stream comprising aromatic alcohol and dialkyl carbonate, and recycling the second top stream to the first reactive distillation column; recovering from the first reactive distillation column a first side stream comprising dialkyl carbonate, and introducing the first side stream to a first rectification column; recovering from the first rectification column a third bottom stream comprising alkyl aryl ether and a third top stream comprising dialkyl carbonate and alkyl alcohol, and recycling the third top stream to the first reactive distillation column; recovering from the first divided wall distillation column (DWC1 200) an azeotrope fourth top stream and recycling the azeotrope fourth top stream to the crude product separation column; and recovering a dialkyl carbonate recycle stream/fourth bottom stream comprising a purified dialkyl carbonate from the first divided wall distillation column (DWC1 200) and recycling the dialkyl carbonate recycle stream to the first reactive distillation column; recovering a second stream comprising dialkyl carbonate, water and alkanol from a side of the first divided wall distillation column (DWC1 200) and introducing the second stream into a decanter; and recovering from the decanter a third stream comprising dialkyl carbonate and recycling the third stream to the first divided wall distillation column (DWC1 200). producing a first top stream comprising dialkyl carbonate and alkyl alcohol from a first reactive distillation column; introducing a reactant stream comprising the first top stream to a first divided wall distillation column (DWC1 200) and separating the mixture with use of the first divided wall distillation column (DWC1 200); recovering from the first reactive distillation column a first bottom stream comprising alkyl aryl carbonate; and introducing the first bottom stream into a second reactive distillation column to produce a second bottom stream comprising diaryl carbonate; recovering from the second reactive distillation column the second bottom stream comprising diaryl carbonate and alkyl aryl carbonate, and a second top stream comprising aromatic alcohol and dialkyl carbonate, and recycling the second top stream to the first reactive distillation column; recovering from the first reactive distillation column a first side stream comprising dialkyl carbonate, and introducing the first side stream to a first rectification column; recovering from the first rectification column a third bottom stream comprising alkyl aryl ether and a third top stream comprising dialkyl carbonate and alkyl alcohol, and recycling the third top stream to the first reactive distillation column; recovering from the first divided wall distillation column (DWC1 200) an azeotrope fourth top stream and recycling the azeotrope fourth top stream to the crude product separation column; and recovering a dialkyl carbonate recycle stream/fourth bottom stream comprising a purified dialkyl carbonate from the first divided wall distillation column (DWC1 200) and recycling the dialkyl carbonate recycle stream to the first reactive distillation column; recovering a second stream comprising dialkyl carbonate, water and alkanol from a side of the first divided wall distillation column (DWC1 200) and introducing the second stream into a decanter; and recovering from the decanter a third stream comprising dialkyl carbonate and recycling the third stream to the first divided wall distillation column (DWC1 200).