Two stage vapor recovery system
US4878931A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Aug 29, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/80
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a system for recovering vapor from an air/vapor process stream. The system is operated in two stages, a high temperature stage and a low temperature stage. The high temperature stage may be referred to as a condenser column. The low temperature stage is referred to as the stripper column. The air/solvent vapor stream is conducted first through the condenser column and then through the stripper column. A countercurrent flow of liquid solvent is provided to both the condenser column and the stripper column. In the low temperature stage (condenser column), the countercurrent flow of liquid solvent is at a temperature near but above the freezing point of water. This results in the removal of most of the solvent vapor and water vapor from the air/solvent vapor mixture. The process stream next flows through the stripper column which has a countercurrent flow of liquid solvent below the freezing point of water which serves to remove the remaining solvent vapor and water vapor contained in the process stream. The system may be operated on a once through basis although better overall recovery will be accomplished if the system is operated in a recirculation mode. Because it is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.