TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The distribution in the first treatment stage takes place into a first container (12) having packed column. The distribution in the first container takes place in a countercurrent process. An inert gas is supplied in the first processing stage. The heat transfer medium containing low-boiling fractions are supplied to the first capacitor (22) in the first treatment stage, in which low-boiling fractions of the low-boiling fractions containing heat transfer medium are separated before the low-boiling fractions containing heat transfer medium are supplied to the second treatment stage. The separation of low-boiling fractions of the heat carrier medium takes place in a second container (32) having a packed column during the second treatment stage. The separation in the second container takes place in a countercurrent process. The separated boiling fractions of a second capacitor (46) are supplied in to the second container in the second treatment stage, in which the low-boiling fractions containing radicals of heat transfer medium are separated and the second container are fed back and/or in which the liquid phase convertible boiling fraction is separated and supplied to a waste disposal. The separation of high boiling fractions and particles from the heat transfer medium takes place in the third container (56) having a packed column in the third treatment stage. The separated heat transfer medium with a third capacitor is supplied into the third container in the third treatment stage, in which the heat transfer medium containing residues of low-boiling fractions are separated. The separated residues of low-boiling components and/or leakage air of the first processing stage are supplied into the third capacitor. The first arrangement comprises a first container having a packed column and/or the second arrangement comprises a second container having packed column and/or the third arrangement comprises a third container having packed column. In the first treatment stage, a first capacitor is arranged downstream to the first container and/or in the second treatment stage, a second capacitor is arranged downstream to the second container and/or in the third processing stage, a third capacitor is arranged downstream to the third container.