Controlling Vacuum Distillation

  • Equilibar schematic for vacuum distillation

​​​Vacuum Distillation

Vacuum distillation is used to lower the pressure above a liquid to less than its vapour pressure. This allows the most volatile liquids to be selectively boiled off and distilled. This is particularly useful if the temperatures required for a fluid to boil at atmospheric pressures would be hot enough to damage sensitive molecules through polymerization or by thermal cracking.

Precisely controlling the vacuum pressure is critical in many processes because the mixture being distilled may contain several liquids with close boiling points. Accurately controlling the vacuum allows for much higher selectivity in the distillation process.

Many vacuum regulators simply do not offer the accuracy required to selectively distill fluids with close boiling points. Those regulators that are sensitive enough are so fragile that they cannot stand up to the corrosive chemistries or elevated temperatures often encountered in vacuum distilleries. The Equilibar EVR Series of precision vacuum regulator is able to solve both the accuracy and the durability problems in one complete package.

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vacuum distillation schematic

Accurate Control for Precision Distillation

The Equilibar EVR controls vacuum pressure very accurately and is able to hold the vacuum precisely at the required set point regardless of fluctuations in the system flow rate or variations in the supply vacuum pressure. The EVR can achieve this because it uses innovative direct diaphragm sealing technology. A responsive flexible diaphragm is the only internal moving part. The diaphragm is nearly frictionless in its movement and does not have accuracy robbing hysteresis and “stiction” (static friction) like traditional ball, gate, or butterfly vacuum regulating valves have. The diaphragm has very low mass and will respond to changes in system flow rate within milliseconds.

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Rugged Design Handles Extreme Temperatures and Chemistries

The EVR is body manufactured from bar stock SS316L for maximum durability and chemical compatibility. The flexible diaphragm material is carefully selected to match your applications temperature and media. Temperature ranges to 325 C can be directly controlled with the EVR. The availability of PTFE, Hastelloy, and Polyimide/Kapton diaphragm materials means that almost all media combinations can be regulated with the EVR.

Learn more about Equilibar’s vacuum regulators

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SS316-vacuum-valve

The Equilibar Vacuum Regulator is shown above with a manual set point kit.
Equilibar Vacuum EVR series Brochure
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