Air Ejectors for Process Vacuum

Process Vacuum is an essential requirement in the Chemical Industry & the Pharmaceutical Industry and is required for following purposes
• Carrying out chemical reactions under vacuum
• Evacuating gases
• Evacuation of Reactors and Vessels.

But at the same time the vacuum equipment working in the Chemical & Pharmaceutical Industry also faces the below challenges
• Corrosion due to corrosive vapours coming from the Chemical media
• Liquid droplets & Solid particles carryover
• Less tolerance for shutdown as vacuum is essential for production.

Air Ejectors are simple devices that operate on the basis of the jet Venturi principle.
Air Ejectors utilize the energy in compressed air for their operation and can be put to use to create vacuum conditions at their suction inlets.

The capacity of the air ejector in terms of suction flow and max vacuum depends upon the internal design of the ejector and the operating compressed air pressure.
A single stage ejector can develop vacuum upto 125 Torr i.e 166 mbar.
Multiple Air Ejectors can be connected in series to obtain even higher vacuum.

Air ejectors are suited for the process vacuum demands in the Chemical & Pharmaceutical sector because of their inherent characteristics
• Can be manufactured in a large range of materials (Plastics, Stainless Steels, Exotic Materials)– it helps to select the best possible material compatible with the involved chemicals and reduces the risk of corrosion
• Air ejectors do not contain any moving parts and have large internal passage areas, hence are not vulnerable to liquid entry or clogging by solid particles.
• As they have no moving parts, maintenance requirements are very less. Also it reduces largely the risk of abrupt breakdowns, helps in maintaining the regular production schedule
• Compressed air is a commonly available utility and hence no additional infrastructure is typically required.