Application of the lotus effect in process engineering

The invention is an evaporator with a heatable heat exchange surface which has a self-cleaning microstructured surface with elevations and depressions. DOLLAR A The microstructured surface of the heat exchanger surface can be produced by powder coating. The invention further provides a process for the evaporation of solutions in an evaporator with self-cleaning microstructured heat exchanger surface, containing the solution to be evaporated is preferably dissolved, emulsified or suspended viscous or solid components. With the inventive evaporators caking of the viscous or solid components of the heat exchanger surfaces is avoided during evaporation of the solutions. This means that such solution to a solvent content of <5 can be evaporated wt .-%.