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Method and apparatus for the formation of particles

  • US 20030047824A1
  • Filed: 08/22/2002
  • Published: 03/13/2003
  • Est. Priority Date: 02/21/1997
  • Status: Abandoned Application
First Claim
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1. A method for forming particles of a substance, the method comprising (a) introducing into a particle formation chamber, the temperature and pressure in which are controlled, a first supercritical fluid and a solution or suspension of the substance in a vehicle;

  • (b) simultaneously introducing, into the particle formation chamber, an impinging flow of a second supercritical fluid, at an angle to, and directed at, the direction of flow of the first supercritical fluid; and

    (c) using either or both of the first and second supercritical fluids to disperse the solution or suspension, and to extract the vehicle from it, substantially simultaneously and substantially immediately on introduction of the fluids into the particle formation chamber.

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