Method and apparatus for enhanced size reduction of...

Details Method and apparatus for enhanced size reduction of... Method and apparatus for enhanced size reduction of...

2006-01-17

2006-01-17

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C264S005000, C366S102000, C366S341000, C366S348000, C424S489000

Reexamination Certificate

active

06986846

ABSTRACT:
The present invention provides a method and an apparatus for forming particles using supercritical fluid. The method includes the steps of mixing a load material with a first flow of a supercritical fluid in a first mixing chamber having a primary mixing device disposed therein to form a melt, transferring the melt from the first mixing chamber to a second mixing chamber having a secondary mixing device disposed therein, mixing the melt with a second flow of the supercritical fluid in the second mixing chamber to form a lower viscosity melt, expanding the lower viscosity melt across a pressure drop into an expansion chamber that is at a pressure below the critical pressure of the supercritical fluid to convert the supercritical fluid to a gas and thereby precipitate the load material in the form of particles.

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patent: 6056791 (2000-05-01), Weidner et al.
patent: 6372260 (2002-04-01), Andersson et al.

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