Abstract: A process and an apparatus for obtaining pure water from seawater, comprising: a) a raw water is provided that comprises at least one non-volatile component (salt), b) the raw water provided is passed as cooling medium into a heat ex-changer, c) additional heat is supplied to the raw water that is heated in the heat exchanger, d) the raw water from step c) is fed to an evaporation zone, e) a carrier gas suitable for water vapour is provided (air), f) the carrier gas is brought into contact with the raw water in counter current flow in the evaporation zone which contains baffles, wherein the carrier gas takes up water vapour from the raw water, g) the raw water that is obtained in step f) that is enriched with the at least one non-volatile component is taken off from the evaporation zone, h) the water vapour- loaded carrier gas from the evaporation zone is fed to the heat exchanger and is cooled in counter current flow to the raw water, wherein the water vapour present in the carrier gas partially condenses ou