Each experiment lasted about 15–30 min at steady state until 10% or 20% by volume of the feed was evaporated as determined from the volume change of the feed in the precalibrated glass boiler. At the end of each experiment, samples from the remaining liquid in the feed glass boiler and from the condensate were taken and stored in a refrigerator for later analysis of the contained aroma compounds. These experiments are reported as absorption–distillation runs.