Distillation pressure control
US4769056A · kind A · utility
1Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1987 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Mar 16, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/19
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a fractional distillation column wherein a split-range controller alternately manipulates a valve for flaring gas to decrease pressure and a valve for importing gas to increase pressure as required to maintain a desired distillation pressure, both flare gas and import gas are minimized by providing a valve position controller that slowly drives both of the control valves manipulated by the split-range controller toward a closed position while maintaining the desired distillation pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.