| abstract |
A process for the heterogeneously catalyzed preparation of carboxylic acid derivatives using a reactor system containing at least one reservoir V, supply lines, at least one pump and a reaction vessel R, characterized in that a permanent gas flow is created by the reaction vessel R through a gas supply line and in which a reaction space, in the heterogeneous catalyst is not packed tightly packed, so separated by at least two filters, that both the material and the gas stream are passed through the reaction space. |