Process and equipment for drying a polymeric aerogel in the pres

Details Process and equipment for drying a polymeric aerogel in the pres Process and equipment for drying a polymeric aerogel in the pres

1998-05-06

1999-10-05

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 61, 521 64, 521146, 521149, 521155, 521180, 521186, 521187, C08J 926, C08J 928

Patent

active

059625392

ABSTRACT:
A process for obtaining an aerogel from a polymeric material that is in the form a sol-gel in an organic solvent, by exchanging the organic solvent for a fluid having a critical temperature below a temperature of polymer decomposition, and supercritically drying the fluid/sol-gel. The process is carried out in a semi-continuous mode that includes the steps of contacting the initial sol-gel with a stream of the fluid at different pressures and temperatures through n+1 pressure vessels A.sub.0 to A.sub.n that each have an inlet for fluid VI.sub.i and an outlet for effluent VO.sub.i wherein the n+1 pressure vessels are operated dependently on each other through a joint fluid supply system and a joint effluent treatment system so that the respective product in each of the pressure vessels A.sub.0 to A.sub.n is submitted to the fluid in successive steps with pressure and temperature following a curve that never cuts the vaporization curve in the pressure-temperature diagram of FIG. 1.

REFERENCES:
patent: 5128382 (1992-07-01), Elliott, Jr. et al.
patent: 5484818 (1996-01-01), DeVos et al.

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