Altering pore size distributions
US4814083A · kind A · utility
16Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1986 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Oct 28, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D67/0088
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Pores that are smaller than or larger than a predetermined range of pore sizes in a porous membrane barrier are blocked with a controlled porosity blocking agent. The pores are first filled with a liquid so as to remove any air therein and then subjected to a transmembrane gas blow at a pressure which will clear the larger pores of the liquid. The larger gas filled pores or the smaller liquid filled pores are then blocked by a blocking agent using a polymer-forming chemical reaction, a precipitate-forming chemical reaction or the physical deposition of solids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.