Cyclic membrane separation process
US6719824B1 · kind B1 · utility
16Cited by
27References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 2003 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Mar 18, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/708
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cyclic process for controlling environmental emissions of volatile organic compounds (VOC) from vapor recovery in storage and dispensing operations of liquids maintains a vacuum in the storage tank ullage. In one of a two-part cyclic process ullage vapor is discharged through a vapor recovery system in which VOC are stripped from vented gas with a selectively gas permeable membrane. In the other part, the membrane is inoperative while gas pressure rises in the ullage. Ambient air is charged to the membrane separation unit during the latter part of the cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.