Process for carrying out pressure reactions with suspended catalysts

In a gas/liquid pressure reaction in the presence of a catalyst, the chemical reaction between the gaseous phase and the liquid phase takes place in a closed reactor (1) at elevated pressure under the action of a finely disperse catalyst suspended in the liquid. The catalyst remains here in the reaction region. For this purpose, a part of the reaction fluid is branched off from the reactor vessel and recirculated through a microfilter (8) operating under the full working pressure in accordance with the crossflow principle. The liquid reaction product is continuously taken off as filtrate at the membrane filter. The essential point is that the suspension stream branched off from the reactor is recycled in a reconcentrated form back to the reactor (1) after the filtrate stream has been taken off in the microfilter (8).