Dortmund Data Bank

The Dortmund Data Bank (short DDB) is a factual data bank for thermodynamic and thermophysical data.

Mixture Properties

 * Phase equilibria data (vapor-liquid, liquid-liquid, solid-liquid), data on azeotropy and zeotropy
 * Mixing enthalpies
 * Gas solubilities
 * Activity coefficients at infinite dilution
 * Heat capacities and excess heat capacities
 * Volumes, densities, and excess volumes (volume effect of mixing)
 * Salt solubilities
 * Octanol-Water partition coefficients
 * Critical data

The mixture data banks contain currently (April 2007) approx. 308,000 data sets with 2,157,000 data points for 10750 components building 84870 different binary, ternary, and higher systems/combinations.

Pure Component Properties

 * Saturated vapor pressures
 * Saturated densities
 * Viscosities
 * Thermal conductivities
 * Critical data (Tc, Pc, Vc)
 * Triple points
 * Melting points
 * Heat capacities
 * Heats of fusion, sublimation and vaporization
 * Heats of formation and combustion
 * Heats and temperatures of transitions for solids
 * Speed of sound
 * P-v-T data including virial coefficients
 * Energy functions
 * Enthalpies and entropies
 * Surface tensions

The pure component properties data bank contains currently (April 2007) approx. 157,000 data sets with 1,080,000 data points for 16700 different components.

Data Sources
The DDB is a collection of experimental data published by the original authors. All data are referenced and a quite large literature data bank is part of the DDB, currently containing more than 92,000 articles, books, private communications, deposited documents from Russia (VINITI), the Ukraine (Ukrniiti) and other former USSR states, company reports (mainly from former GDR companies), theses, patents, and conference contributions.

Secondary sources like data collections are normally neglected and only used as a literature source. Derived data are also not collected with the main exception of the azeotropic data bank which is build partly from evaluated vapor-liquid equilibrium data.

History
The Dortmund Data Bank has been founded in the 1970s at the University of Dortmund in Germany. The original reason for starting a vapor-liquid phase equilibria data collection was the development of the group contribution method UNIFAC which allows to estimate vapor pressures of mixtures.

The DDB has been extended later to many other properties and increased dramatically in size also because of intensive (German) government aid. The funding has ended and the further development and maintenance is performed by DDBST GmbH, a company founded by members of the industrial chemistry chair of the Carl-von-Ossietzky University Oldenburg, Germany.

Additional contributors are the DECHEMA, the FIZ CHEMIE (Berlin), the Technical University in Tallinn, and others.

Availability
The Dortmund Data Bank is distributed by DDBST GmbH as in-house software. Many parts of the Dortmund Data Bank are also distributed as part of the DETHERM data bank which is also available online.