Process for drying water-wet membranes
US4430807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1982 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | May 17, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B7/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved process for drying water-wet, cellulose ester membranes is described. It has been found that by contacting one side of the membrane with a liquid mixture of a water-miscible, volatile C.sub.1 to C.sub.6 hydrocarbon and a water-immiscible organic compound, while an inert gas stream or vacuum is maintained on the other surface of the membrane, water can be displaced from the membrane economically, rapidly and without adversely affecting the structure of the membrane. A 1 to 1 volume mixture of isopropanol and isooctane is particularly preferred in this step. The essentially water-free membrane is then dried by applying reduced pressure or an inert gas stream to produce a membrane having exceptional separation characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.