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Ludwig's Applied Process Design for Chemical and Petrochemical Plants, 4th Edition by A. Kayode Coker, PhD

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8 EJECTORS AND MECHANICAL VACUUM SYSTEMS

8.1 EJECTORS

Industry has grouped pressures below atmospheric level into [1]:

  Range of Pressure
Rough vacuum 760–1 torr
Medium vacuum 1–0.001 torr
High vacuum 0.001–10−7 torr
Ultra-high vacuum 10−7 torr and below

Rough vacuum is used in about 90% of the chemical, petrochemical, and other processing industries. This range generally includes vacuum distillation, filtration, crystallization, drying, reaction, and others. Medium vacuum is most applicable to molten metals degassing, molecules distillation, freeze drying, and others. High and ultra-high ranges are most useful for thin films, research, and space simulation.

For reference, note that the unit of vacuum measurement is torr.

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