ThermoData Engine (TDE) is the first full-scale software
implementation of the dynamic data evaluation concept, as reported
in this journal. The present paper describes the first application
of this concept to the evaluation of thermophysical properties for
material streams involving any number of chemical components with
assessment of uncertainties. The method involves construction of Redlich–Kister
type equations for individual properties (excess volume, thermal conductivity,
viscosity, surface tension, and excess enthalpy) and activity-coefficient
models for phase equilibrium properties (vapor–liquid equilibrium).
Multicomponent models are based on those for the pure-components and
all binary subsystems evaluated on demand through the TDE software
algorithms. Models are described in detail, and extensions to the
class structure of the program are provided. Novel program features,
such as ready identification of key measurements for subsystems that
can reduce the combined uncertainty for a particular stream property,
are described. In addition, new product-design features are described
for selection of solvents for optimized crystal dissolution, separation
of binary crystal mixtures, and solute extraction from a single-component
solvent. Planned future developments are summarized.