PPDS Physical Property Data

PPDS (Physical Property Data Service) was originally developed in the United Kingdom by the Institution of Chemical Engineers and the National Physical Laboratory. It is now available as a Microsoft Windows version from NEL, a division of the TUV Sudde-untschland Group (www.nel.uk). PPDS is made available to universities at a discount. 

Hali, ., VVichterle, I., Polak. J., and Boublfk, T., Vapour-Liquid Equilibrium Data at Normal Pressure, Pefgamon Press, London 1969 [106a] The Institution of Chemical Engineers, London, runs a data service, PPDS (Physical Property Data. Service), which covers also liquid-vapour equilibrium data Kortiim, G., and Freier, H.-J., Chemie-Ing.-Techn. 26 (19M), 670— 675 Weber. U. von, Z. phys. Chem, N.F. 38 (1963) 3/4, 129-139 Gelbin, D., Chem. Techn. 16 (1963) 1, 6—9... 

RBDOPT is coded in an object oriented environment using (C++) and uses distributed computing techniques to speed up the calculations. The thermophysical properties are estimated using Physical Property Data Service (PPDS). PPDS supports over 900 components and 36 physical property routes including NRTL, SRK, UNIFAC and UNIQUAC. The general structure of RBDOPT is shown in Figure 9.13. RBDOPT defines a batch distillation column as an object. Procedures... 

The Physical Properties Data Service (PPDS) system is a combination of calculadonal software and associated databases which has been produced to satisfy these common engineering calculation requirements outlined above. The databanks and associated software have been developed over many years by the NEL Executive Agency, based at East Kilbride, Scotland. The complete PPDS system covers the full set of thermodynamic properties and contains some safety information in addition to the transport properties. The following sections of this chapter describe the main elements of the system and their operation. 

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