Physical Properties Research Facility--Vapor Pressure Detemination Research

Twin ebulliometer measures vapor pressures up to 2036 mm Hg

Twin ebulliometer measures vapor pressure of liquid-phase samples for pure compounds and components of narrow boiling point mixtures at high pressures:

Pressure range: 10 - 2036 mm Hg
Temp range: Ambient - 675 K
Accuracy: +/-0.02% pressure; +/-0.002 K
temp

The equipment is capable of measuring the bubble point and condensation temperatures of both the sample and standard.

The Physical Properties Research Facility provides precision vapor pressure measurements of pure components and components of narrow boiling point mixtures over an extremely wide range of pressures and temperatures (15 to 2036 mm Hg, ambient to 650 K).

Torsion-effusion equipment precisely measures vapor pressure of solid- and liquid-phase samples for pure compounds at low pressures:

Pressure range: 0.001 - 0.1 mm Hg
Temp range: Ambient - 400 K
Accuracy: +/-0.02% pressure; +/-0.001 K temp

Compounds can be purified in house to a minimum purity level of 99.9 mol % to meet rigid sample quality for high precision vapor pressure analysis.

Torsion effluent equipment
Torsion effusion equipment measures vapor pressure at very low pressures.

Inclined-piston equipment determines vapor pressure of solid- and liquid-phase samples for pure compounds at intermediate pressures:

Pressure range: 0.1 - 30 mm Hg
Temp range: Ambient - 675 K
Accuracy: +/-0.02% pressure; +/-0.002 K temp

This typically compares to +/- 5% for most commercially available equipment.

Derived information

Vapor pressure equations
Enthalpies of vaporization
Acentric factors
Activity coefficients
Solubility parameters
Reference states for vapor-liquid equilibrium

Applications

Data for safety evaluations and Material Safety Data Sheets (MSDS)
Predict regulatory compliance
Size equipment during plant design
- Containment vessel thickness
Optimize plant operating conditions

Contact Bill Steele, PPRF Director
Sponsored by DOE National Petroleum Technology Office
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This page updated 02/27/02
Oak Ridge National Laboratory (ORNL) is operated by UT-Battelle, LLC, for the U.S. Department of Energy.