Cyclic membrane separation process
US6887300B2 · kind B2 · utility
6Cited by
32References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 16, 2004 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Jan 16, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- 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 the first part 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 second part, the membrane is inoperative while gas pressure rises in the ullage. In one aspect of this invention, a vacuum is drawn in the membrane separation unit thus reducing overall VOC emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.