Vapor Pressures
For the determination of vapor pressures (T, Ps data) of pure components or defined mixtures set-ups with different designs (static or dynamic) and measurement ranges are available.
- Small glass ebulliometer (about 1 mbar to 1 bar, 253 K to 573 K)
- Static cells of different metal materials: stainless steel Hastelloy, titanium, special alloy, gold plated etc. (about 50 mbar to 400 bar, 213 K to 870 K)
Ranges are approximate values and may vary for different combinations of cell material and systems to measure.
Small glass ebulliometer
Vapor pressures can be measured by means of a dynamic method with an ebulliometer like the small glass ebulliometer (similar to the Scott ebulliometer, see following figure). With this equipment, vapor pressures of pure components can be experimentally determined in a temperature range from approx. 250 to 573 K and at pressures from about 2 mbar up to 1 bar. At a given pressure (regulated by an electronic pressure control), the boiling temperatures of a component are measured. Due to the volume of the equipment only small amounts of the substances (about 20 ml) are needed.
With the small glass ebulliometer (or with our Scott ebulliometer) also isoplethic vapor-liquid equilibrium measurements can be performed.
