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Decoupled flow and pressure setpoints in an extraction instrument using compressible fluids

  • US 5,240,603 A
  • Filed: 12/06/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 03/02/1990
  • Status: Expired due to Fees
First Claim
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1. Apparatus for the extraction of components from a sample comprising:

  • a pump for pumping a supercritical fluid comprising a pump motor and a pump motor speed control;

    means for regulating the pressure of the output of said pump to a setpoint pressure;

    a flow system for connecting a flow of supercritical fluid from the pump to an extraction section for retaining a sample;

    an expansion nozzle connected to the extraction section and having an orifice of a variable predetermined opening size thereby achieving a degree of decoupling flow and pressure; and

    a static trap subassembly connected directly to the expansion nozzle,whereby the pressure drop across said nozzle permits the recovery of dissolved material precipitating from the expanding fluid.

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