Membrane reactor for gas-liquid reactions, in particular sulfonation or sulfation reactions

A continuous falling film reactor (10) for obtaining a product by a gas-liquid reaction, in particular a sulfonation or sulfation reaction, said continuous falling film reactor (10) comprising: a reactor body or housing (12) adapted to accommodate a plurality of chambers, in particular elongated and/or tubular chambers (14), for the reaction between a first reagent and a second reagent, the reaction chamber (14) has a corresponding inner surface (140), in particular for the first reagent to slide in the form of a film or layer; means (16) for introducing the first reagent, in particular in the liquid phase, in particular in the form of an organic raw material, into the corresponding, in particular elongated and/or tubular reaction chamber (14); and means (18) for feeding the second reagent, in particular in the gas phase, in particular in the form of sulfuric anhydride, into a corresponding one of the reaction chambers (14). The continuous falling film reactor (10) further comprises a device or head (24) for