Title:
SELECTIVE SEPARATION AND CONCENTRATION OF TOXIC NERVE AGENTS
Document Type and Number:
WIPO Patent Application WO2003039701
Kind Code:
A3
Abstract:
The invention relates to methods of increasing the relative concentration of a target molecule in a gas stream, typically organophosphonates like DMMP or nerve agents like sarin, tabun or soman in air, so that it can be more easily detected, e.g. by a semiconducting metal oxide based sensor. The gas stream is passed through an adsorbent, typically silica. Either both the target molecules and the non-target molecules are adsorbed or only one type of these molecules are adsorbed. Desorption is performed using a chemical displacer. When both target molecules and non-target molecules are adsorbed, the chemical displacer is chosen so that it displaces only either the target molecules or the non-target molecules.
Inventors:
TRIPP CARL P
KANAN SOFIAN M
KANAN SOFIAN M
Application Number:
PCT/US2002/033748
Publication Date:
August 21, 2003
Filing Date:
October 22, 2002
Export Citation:
Assignee:
UNIV MAINE (US)
International Classes:
B01D53/04; B01J20/10; B01J20/283; G01N27/12; G01N1/22; G01N1/34; G01N1/40; G01N30/08; G01N30/26; G01N30/88; (IPC1-7): B01D53/04; G01N1/40; G01N1/34
Domestic Patent References:
| WO1999058225A1 | 1999-11-18 |
Foreign References:
| US3457704A | 1969-07-29 | |||
| US4054430A | 1977-10-18 | |||
| US4368347A | 1983-01-11 | |||
| GB1265036A | 1972-03-01 | |||
| EP0350992A1 | 1990-01-17 |
Other References:
KANAN SOFIAN M., TRIPP CARL P., LANGMUIR, vol. 17, no. 7, 3 April 2001 (2001-04-03), pages 2213 - 2218, XP001147515
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