Dortmund Data Bank
The Dortmund Data Bank ( DDB short ) is a collection of thermophysical and thermodynamic properties of pure substances and mixtures.
Content
Contains the Dortmund Data Bank
- Phase equilibrium data ( as vapor - liquid, liquid - liquid, solid -liquid, also data for azeotropic and zeotropic systems )
- Gas solubilities
- Caloric data such as enthalpies (melting, evaporation, sublimation, latent heats ), heat capacities and heats of mixing
- Transportation data, such as viscosities and thermal conductivities
- Densities and volumes, excess volumes
- Surface tensions
- Salt solubilities
- Activity coefficients at infinite dilution
- Octanol - water partition coefficient
- Bibliography
A fairly new component are material data for polymers.
The DDB contains almost exclusively experimentally determined data, which were published by the original authors, or have been made available (so-called private messages or corporate data in which the editors wish to remain anonymous ). The data in the DDB are fully referenced, which means that an indication of the source is available for all records. This principle is not consistently followed in three cases: azeotropes and zeotropic data were often derived from vapor -liquid equilibrium data by means of UNIQUAC or NRTL, so this part of the database contains a significant proportion of calculated values . Another exception is a set of material constants that have been outsourced as so-called recommended values for calculations in a basic database. This basic database but, strictly speaking, not part of the DDB. The third exception is the database for model or equation parameters which have been calculated by nature.
History
The work on the Dortmund Data Bank was in the seventies at the University of Dortmund ( Ulfert Onken, Jürgen Gmehling, Wolfgang Arlt ) started a data base for the development of a predictive method for vapor-liquid equilibria of mixtures of substances called UNIFAC (Universal Quasi- Chemical Functional Group Activity Coefficients, see also to obtain group contribution methods).
Later the scope was greatly expanded by public funding. This public funding has now expired and the remaining structure was to a private company ( GmbH DDBST ) transfer, which is a spin-off of technical chemistry at the Carl von Ossietzky University of Oldenburg. Other contributions come from the DECHEMA, by FIZ CHEMIE Berlin, from Tallinn University of Technology and several other partners.
The Dortmund database is also now provides or the Department of Industrial Chemistry, Carl-von- Ossietzky University and settled there industry consortium to develop the models UNIFAC and PSRK free of charge. The DDB has also become the basis for the development of some models for the estimation of pure component properties, especially of normal boiling points, critical data, including m. Other developments include the development of models of electrolyte, which are also formed by using DDB data.
Availability
The Dortmund database is distributed by the DDBST GmbH and is also, at least partially, through an Internet Service DECHEMA, here as part of DETHERM database available. The DECHEMA receives it once a year by exporting the data of DDB, which is imported into the DETHERM.
Excerpts from DDB have been published as books. This is a series of multi-volume books in the DECHEMA Chemistry Data Series on vapor -liquid equilibria, enthalpies of mixing, liquid-liquid equilibria and activity coefficients as well as a book on azeotropic and zeotropic mixtures.