Pressure swing adsorption process
US4650501A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1986 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Mar 19, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2259/404
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In air separation and other gas separations employing pressure swing adsorption technology, reduced cycle times are achieved by an advantageous combination of simultaneous processing steps. The repressurization step in which the upper adsorption pressure is reached in each adsorbent bed is carried out while simultaneously withdrawing product gas from that bed. Following cocurrent depressurization steps in which released void space gas is used for pressure equalization and provide purge gas purposes, each bed, in turn, is further cocurrently depressurized, and the released gas is used for pressure equalization purposes, while the bed is simultaneously being countercurrently depressurized. This latter countercurrent depressurization is then continued to a lower desorption pressure is reached, after which the bed is partially repressurized by pressure equalization, before being further repressurized to upper adsorption pressure with simultaneous withdrawal of product as the next processing cycle is begun.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.