VACUUM PUMPS IN CHEMICAL-ENGINEERING

After a general systematization of the working principles of vacuum pumps, the most important types - liquid ring vacuum pumps, sliding vane vacuum pumps, and ejectors - are discussed with regard to their development and their working principle. Attention is focused on aspects which allow a comparison of the advantages and disadvantages of vacuum pumps. A systematic survey of the criteria leading to the selection of a certain type of pump shows that these criteria may be based on the process as a whole or on environmental and safety considerations as well as economic aspects.