Ultrasound enchancement of membrane permeability
US4780212A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Jul 31, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D63/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for enhancing or controlling permeability of large molecular weight molecules in a membrane system wherein molecules in solution are contacted with membranes and the system is exposed to ultrasound at a selected intensity and frequency and for a specific length of time. The method may be designed to insure that only reversible changes in the membrane result from exposure to the ultrasound or to enhance the rate of degradation of the membrane and/or selectivity of passage of molecules through the membrane. The method may include selection of the membrane composition and structure, including the pore size, thickness, crystallinity and molecular arrangement. Selection of the solvent or media in which the molecules are suspended may be used to further enhance or control permeability. The media may be either an aqueous or inorganic solution with the physical and chemical properties may be selected to attenuate sound transmission or to enhance stability of the molecule permeating the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.