Portable extraction instrument
US5549819A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1995 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Jan 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Methods and apparatus for extracting an analyte from a sample using a field-portable extraction instrument. The preferred embodiment of the extraction instrument includes an extraction fluid source, a sample container, a valve element, a nozzle, and a collection trap vessel. The methods of the present invention include the steps of inserting the sample into the sample container, attaching the sample container to the instrument, and providing a quantity of pressurized extraction fluid from the pressurized extraction fluid source into the sample container to initiate the extraction process. Extraction is facilitated by directing the extraction fluid into the sample at a rapid flow rate such that the sample and extraction fluid are vigorously mixed and a sample/solvent mixture is created. The valve element is then operated to isolate the extraction fluid source and to fully close the sample container. As an optional step, heat may be applied to the closed sample container to create conditions for effecting supercritical fluid extraction. The valve element is then operated to direct a fluid/constituent mixture from the sample container section to the collection trap vessel. The analyte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.