Obiettivo Problems to be solvedPartially fluorinated alcohols, FAs, and hydrofluoroethers, HFEs, have been suggested as alter-natives for CFCs and HCFCs. To determine the environmental impact of FAs and HFEs released into the troposphere, the atmospheric lifetimes and the nature and fate of their resulting oxidation products are needed. This, in turn, requires kinetic data for their atmospheric oxidation processes, information on their degradation mechanisms, information on their infrared, ultraviolet and visible absorption cross-sections, and information on their partitioning between the vapour and the aqueous phases. The existing data for these quantities are inade-quate.Scientific objectives and approachThe main objective of the project is to provide quality controlled laboratory data and modelling results of global warming potentials for an integrated analysis of new CFC and HCFC alternatives. To achieve the scientific objectives, the laboratory work includes measurements of OH and Cl reaction rate constants with a series of FAs and HFEs, and of selected primary oxidation products from these. The product distribution is investigated and several reaction chambers are employed in order to eliminate artefacts. The kinetics of the subsequent formation of peroxy radicals and their reactions with other peroxy radicals and NOx are also studied. An experimental set-up for measuring Henry Law constants and uptake coefficients is constructed and selected FAs, HFEs, and FA and HFE oxidation products are investigated. This provides information of their interaction with aerosols and clouds. Spectroscopic measurements in the infrared, ultraviolet and visible spectral regions provide absorption cross-sections from which estimates of the direct photo degradation process under sunlight irradiation is made. The spectroscopic data are also used for calculating radiative forcing and global warming potentials employing 2-D and 3-D chemical transport models for evaluating the atmospheric residence time of the compounds. Additional experiments using the EUPHORE reactor give "pseudo" realistic information on the tropospheric degradation mechanisms. Theoretical calculations of bond energies combined with the experimental reaction rate constants provide a structure-reactivity relationship for the FA and HFE classes of compounds. On the basis of the laboratory data and the EUPHORE experiments a general degradation scheme is developed.Expected impactsThe project provides essential kinetic, mechanistic, physico-chemical properties and spectroscopic data for a complete analysis of the environmental fate of possible replacement compounds and thereby makes an important contribution to the integrated analysis for selection of new alternatives to CFCs and HCFCs. Campo scientifico natural scienceschemical scienceselectrochemistryelectrolysisnatural scienceschemical sciencesorganic chemistryalcoholsnatural sciencesearth and related environmental sciencesatmospheric sciencesmeteorologytropospheresocial scienceslawnatural sciencesmathematicsapplied mathematicsmathematical model Programma(i) FP5-EESD - Programme for research, technological development and demonstration on "Energy, environment and sustainable development, 1998-2002" Argomento(i) 1.1.4.-2. - Key action Global Change, Climate and Biodiversity Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore UNIVERSITY OF OSLO Contributo UE Nessun dato Indirizzo Blindern 0315 OSLO Norvegia Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto INSTITUTE OF CHEMICAL PHYSICS - RUSSIAN ACADEMY OF SCIENCES Russia Contributo UE Nessun dato Indirizzo 4,Kosygin Street 4 117334 MOSCOW Mostra sulla mappa Costo totale Nessun dato UNIVERSITY OF CRETE Grecia Contributo UE Nessun dato Indirizzo Knossos Avenue 71409 IRAKLION Mostra sulla mappa Costo totale Nessun dato
