Multiple solvent delivery system
US5360320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1992 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Feb 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D11/131
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.