Vapor Liquid Equilibrium

Static total pressure apparatus

Temperature range          10 °C - 90 °C
Pressure range                2 - 2000 kPa

The apparatus can also be used for pure component vapor pressure measurements.
Hastelloy C-276 or stainless steel cells (volume appr. 110 ml) available.

Recirculation still made of glass

Temperature range          20 °C - 250 °C
Pressure range                2 - 101 kPa

The compositions of the samples are analyzed by gas chromatograph (GC), refractive index or titration. Also pure component vapor pressure can be measured.


Sapphire tube apparatus

Temperature range:       -40 °C - 150 °C, Rolsi
Temperature range:        25 °C - 150 °C, DB Robinson
Pressure range:               0 - 15 000 kPa

The sapphire tube is attached to two flanges made of stainless steel. The fluid in the tube can be mixed with a magnetic mixer. Circulation of sample to a GC-liquid sampling valve for analysis is possible. By changing flanges and inserting a piston into the tube bubble point measurements can be made. Other uses are pure component and mixture critical point measurements, vapor pressure determinations, density measurements, tubular reactor with visual observation possibility.

Two sapphire tube apparatus designs:
One with two Rolsi samplers
One JEFRI originating the D B Robinson design




Head Space sampler + GC with FID and TCD

Agilent Techlologies head space sampler 7697A with 111 vial tray and Agilent Techlologies gas chromatograph 6890 N with flame ionization detector (FID) and thermal conductivity detector (TCD).


Continuous flow apparatus

Temperature range:        25 °C - 400 °C
Pressure range:               0 - 12 000 kPa

The continuous flow apparatus is designed for phase equilibrium measurements at high pressure and temperature. The measurement method is based on observing visually the phase change.

The apparatus is suitable for determination of:

  • Vapor pressure of pure component
  • Bubble point pressures of mixtures
  • Gas solubility

In particular, the apparatus can be applied for heat sensitive materials due to the short residence time in the heated zone. Measurements can be made for systems containing "heavy components" for which GC-analysis is challenging.



Page content by: | Last updated: 03.01.2017.