Apparatus and method for supercritical fluid extraction

US6071408A · kind A · utility

Assignee

• Isco, Inc. · US

Inventors

• Robert W. Allington · Lincoln, US
• Daniel G. Jameson · Roca, US
• Dale A. Davison · Waverly, US
• Dale L. Clay · Lincoln, US
• Robin R. Winter · Lincoln, US
• Yoossef Tehrani · Lincoln, US

Key dates

• Filing date: May 18, 1998
• Grant date: Jun 6, 2000
• Expiry date: May 18, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2035/0441
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To provide performance particularly in handling supercritical extraction systems, a specially designed pump includes a cam-driven, single-plunger with a cam having a profile that enables the pumping system to avoid destructive reverse torque on the cam, gear train and drive motor after the cam passes top dead center. The fluid volume leaving the pump is determined by measuring only pressure or other parameters related to flow and movement of the plunger. Measurement of the fluid volume leaving the pump is useful for recording or indicating the flow rate while the pump is operating.