Solvent extraction method and apparatus for recovering analytes
US5384023A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Jun 7, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/0419
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved liquid/liquid solvent extraction method and apparatus utilizes an external electrode for creating an electric field within an extraction cell to shatter aqueous sample droplets flowing within a non-conductive solvent. The external electrode is in intimate contact with the exterior surface of the insulative cell wall so as to preclude direct electrical contact between the electrode and the internal liquids. A sample interface detector permits the interface between the two liquids to be detected when the liquids sequentially flow out from the cell, thereby facilitating separate collection of the liquid. Interface detection is achieved by coupling electrical pulses into the flowing liquid to cause ionization charge/discharge cycles in the conductive aqueous sample but not in the non-conductive solvent. Downstream detection of the charge/discharge cycle in the liquid identifies the interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.