Inert gases, such as carbon dioxide, nitrogen and argon, reactants such as carbon monoxide and olefins (cf. (B), for example methyl acrylate),reaction products, such as dimethyl oxalate (cf. (A)) and dimethyl carbonate (cf. (C)) as well as methanol dissolved in the gas stream can be mentioned here by way of example.Dimethyl oxalate is of great interest as an intermediate, for example for the prepa