Multiple solvent delivery system

Details Multiple solvent delivery system Multiple solvent delivery system

1992-02-27

1994-11-01

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 5, 417 442, 417 53, F04B 4106

Patent

active

053603206

ABSTRACT:
To control a solvent composition in a supercritical fluid system, a first pump pumps a first solvent through a first conduit into a mixer and a second pump pumps a second solvent through a second conduit into the mixer. First and second transducers measure the pressure in the first and second conduits and generate first and second signals proportional to the pressures. Each pressure signal is multiplied by a corresponding programmed concentration signal and compared to the programmed pressure in a feedback system to generate an error signal. The error signal is multiplied by concentration signals from a programmer to control the pumping rate of each pump. The pumps pressurize each fluid one at a time at the start of a run. The pressurization process is also used for producing disturbance-free flow as delivery is changed from one pump to another during prolonged runs.

REFERENCES:
patent: 4714545 (1987-12-01), Bente et al.
patent: 4913624 (1990-04-01), Seki
patent: 4915591 (1990-04-01), Funke

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