Composite polyamide reverse osmosis membrane and method of producing the same
US6368507B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1998 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Oct 14, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/125
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite polyamide reverse osmosis membrane and method of producing same. In one embodiment, the membrane is made by coating a porous polysulfone support for about 40 seconds with an aqueous solution containing (i) a polyfunctional amine in the form of 2 wt % of meta-phenylenediamine (MPD), (ii) a polar solvent in the form of 0.3 wt % 2-ethyl-1,3-hexanediol (EHD), and (iii) an amine salt-forming combination of 2.3 wt % camphorsulfonic acid (CSA) and 1.1 wt % triethylamine (TEA). Next, the excess aqueous solution is removed, and the coated support is dipped for about 1 minute in a 0.1 wt % organic solvent solution of trimesoyl chloride (TMC) in a mixture of alkanes having from 8 to 12 carbon atoms. After draining the organic solvent solution off, the resulting composite membrane is heated at 90° C. for about 3.5 minutes and then rinsed in a 0.2% Na2CO3 aqueous solution at room temperature. The resultant membrane exhibits a flux of 47.9 gfd and a salt rejection of 97.6% when used at 225 psi for an aqueous solution containing 2000 ppm of NaCl. In another embodiment, the aqueous solution contains (i) a polyfunctional amine in the form of 2 wt % of MPD, (ii) a combination of pola…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.