Separation of organic liquid from mixture employing porous polymeric ultrafiltration membrane
US4770786A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1985 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Mar 15, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/0283
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for separating and condensing at least one selected organic liquid from a feed comprising a mixture thereof in the state of one phase or two phases which comprises conducting ultrafiltration by using a polymeric porous membrane having a mean pore size(2ra ) of at least 10.sup.-6 cm and a porosity (Pr) of at least 50% under the conditions that the effective pressure gradient (.DELTA.P/d) loaded on the polymeric porous membrane satisfies the following equations: EQU .DELTA.P/d<1000 (cmHg/cm) (1) and EQU .DELTA.P/d.ltoreq.1.times.10.sup.-1 d.eta./[(ra).sup.2 .multidot.Pr](cmHg/cm) (2) wherein PA1 .DELTA.P (cmHg) is the effective pressure difference between one and the other surfaces of the membrane, PA1 d(cm) is a thickness of the membrane, PA1 ra(cm) is a mean pore radius of the membrane, PA1 Pr(%) is a porosity of the membrane and PA1 .eta.(centipoise) is a viscosity of the selected organic liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.