for the process according to the invention if after process step d a certain amount of water is present in the rhamnolipid enriched organic phase this has the technical effect that by simply removing for example distilling off the organic solvent a highly concentrated aqueous rhamnolipid fraction can be obtained consequently a preferred process according to the invention is characterized in that the organic solvent or the mixture of organic solvents of process step b is able to dissolve water in an amount of from 0 1 to 30 by weight preferably 0 5 to 7 by weight where the percentages by weight refer to the sum of organic solvent and water preferred organic solvents of process step b are selected from methyl acetate ethyl acetate propyl acetate isopropyl acetate butyl acetate isoamyl acetate butan 1 ol butan 2 ol and diethyl ether with ethyl acetate being particularly preferred in some embodiments of the present invention it is preferred that the volume ratio at 20 u00b0 c of aqueous medium to organic solvent or to the mixture of organic solvents prior to bringing them into contact is from 0 2 1 to 5 1 preferably from 2 1 to 4 1 and more preferably from 2 9 1.