Supercritical fluids are neither gas nor liquid, but can be compressed
gradually from low to high density and they are therefore interesting
and important as tunable solvents and reaction media in the chemical
process industry. By adjusting the density the properties of these
fluids can be customised and manipulated for a given process - physical
or chemical transformation. Separation and processing using
supercritical solvents such as CO2 are currently on-line
commercially in the food, essential oils and polymer industries. Many
agencies and industries are considering the use of supercritical water
for waste remediation. Supercritical fluid chromatography represents
another, major analytical application. Significant advances have
recently been made in materials processing, ranging from particle
formation to the creation of porous materials.
The chapters in this book provide tutorial accounts of topical areas
centred around: (1) phase equilibria, thermodynamics and equations of
state; (2) critical behaviour, crossover effects; (3) transport and
interfacial properties; (4) molecular modelling, computer simulation;
(5) reactions, spectroscopy; (6) phase separation kinetics; (7)
extractions; (8) applications to polymers, pharmaceuticals, natural
materials and chromatography; (9) process scale-up.