Unfortunately, the word “vacuum” has been bandied about so much that the technology it stands for has been degraded to mere marketing hype, ignoring its very real process and cost benefits. We would therefore like to make one thing clear from the beginning: whenever the use of vacuum makes technical sense and the costs involved are acceptable, we employ it. An example of sensible use of vacuum is for rapidly conveying solvent between tanks and a plant’s individual modules. By comparison, using vacuum to dry complex parts poses much greater requirements because it means designing a reinforced working chamber. This, in turn, can quickly raise the associated costs to unacceptable levels. In such cases, we generally succeed in finding cost-effective and often comparable or superior alternatives to vacuum technology by employing appropriate modules based on sophisticated process technology. The use of vacuum for solvent distillation is also reflected in the costs, but this time in a good way, since it generates enormous savings. Under atmospheric conditions, the best that can be achieved with an oil-solvent mix is a distillation ratio of 50:50 – in other words, a whole litre of solvent is lost with every litre of residual oil that is pumped out into the disposal drum.