Preparation of high performance ultra filtration hollow fiber membrane
US8104624B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2009 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Feb 11, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/341
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A multipolymeric mixture is provided that includes a hydrophobic polymer, two different grades of a water-soluble polymer, water as non-solvent and a solvent suitable for all polymers involved. The dissolved hydrophobic polymer has the affinity to enmesh the water-soluble polymers to form a clear and viscous dope. Water-soluble polymers contribute to the pore formation process and hydrophilicity of the finally coagulated membrane according to the makeup of their molecular weight distribution.Water as a non-solvent takes the dope very near towards unstable zone, which helps in speeding up the membrane formation process in a diffusion induced phase inversion technique. The dope is then spun through a concentric orifice spinneret and solidified by passing it through a coagulation bath to form hollow fiber asymmetric membranes of ultra filtration grade with superior water permeability and separation characters even at higher feed turbidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.