| US 7,491,334 B2 | ||
| Method of treating reverse osmosis membranes for boron rejection enhancement | ||
| Daniel L. Comstock, San Diego, Calif. (US) | ||
| Assigned to North Pacific Research, LLC, San Marcos, Calif. (US) | ||
| Filed on Jul. 20, 2005, as Appl. No. 11/185,104. | ||
| Claims priority of provisional application 60/614500, filed on Sep. 29, 2004. | ||
| Prior Publication US 2006/0065598 A1, Mar. 30, 2006 | ||
| Int. Cl. B01D 61/02 (2006.01); B01D 61/12 (2006.01); B01D 63/10 (2006.01); B01D 63/12 (2006.01) | ||
| U.S. Cl. 210—652 [210/650; 210/651; 210/653; 210/321.69; 210/501] | 11 Claims |
| 1. A method for treating a polyamide reverse osmosis membrane for boron rejection enhancement, comprising:
contacting the reverse osmosis membrane with a chemical coating applied by recirculating the chemical through the membrane
at 50 ppm concentration and about 100 psig for about one hour to obtain a reverse osmosis membrane having a boron rejection
of greater than 97.6% from seawater in a single pass,
wherein the chemical coating comprises poly(hexmethylenebiguanide)hydrochloride.
|