by Al Kaziunas
RESS is a technique using supercritical fluids to make small or nano -particles.
RESS is a technique using supercritical fluids to make small or nano -particles.
RESS is an acronym for Rapid Expansion of a Supercritical Solution and compounds that are soluble in supercritical CO2 can be discharged through a nozzle to atmospheric pressure. As the supercritical solution depressurizes, the dissolved compounds are no longer soluble in gaseous CO2 and they precipitate as fine particles.
A serious shortcoming with the RESS technique is the collection of the small particles. Typically, the particles precipitate on the surface of a collection vessel or separator and must be scraped off the surface of the vessel. This is a tedious task and it is very difficult to collect most of the particles. Applied Separations, a supercritical CO2 company, has addressed this problem by discharging the RESS particles into a specially designed bag filter inserted into the RESS collector making the collection and recovery of RESS particles a much easier task.
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