| 发明名称 |
Liquid filtration media |
| 摘要 |
A liquid filter with a composite medium that has a nanoweb adjacent to and optionally bonded to a microporous membrane. The membrane is characterized by an LRV value of 3.7 at a rated particle size, and the nanoweb has a fractional filtration efficiency of greater than 0.1 at the rated particle size of the membrane. The nanoweb also has a thickness efficiency ratio of greater than 0.0002 at that efficiency. The nanoweb acts to provide depth filtration to the membrane, prefilters particles and extends the lifetime of the membrane. |
| 申请公布号 |
US9180393(B2) |
申请公布日期 |
2015.11.10 |
| 申请号 |
US201012940312 |
申请日期 |
2010.11.05 |
| 申请人 |
E I DU PONT DE NEMOURS AND COMPANY |
发明人 |
Chen Guanghui;Gommeren Henricus Jacobus Cornelis;Knorr Lawrence Mark |
| 分类号 |
B01D61/00;B01D39/00;B01D29/46;B01D24/00;B01D39/16;B01D61/14;B01D61/16;B01D61/18;B01D69/12;D04H1/42 |
主分类号 |
B01D61/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A filter system for filtering particles from liquid comprising at least one nanoweb layer of polymeric nanofibers upstream of, and in fluid contact with, a microfiltration membrane, wherein the nanoweb layer has a filtration efficiency rating of at least 10% to 30% for a particle size at which the membrane is rated with an LRV of 3.7 or greater, and a thickness efficiency ratio of greater than about 0.0002, and wherein the pressure drop across the nanoweb is less than or equal to 60% of that across the filter system for a given fluid flow rate. |
| 地址 |
Wilmington DE US |
