The slow gas-phase oxidation of tetrahydrofuran was studied under static conditions at 220°C. The relative amounts of each product, if extrapolated to zero reaction time, show which are the primary reaction products, and the reaction stoichiometry was thus established. Rate constants for hydroperoxides production and consumption were calculated; these hydroperoxides are responsible for chain branching. Carbon monoxide and carbon dioxide have been shown to be formed in the early stages of the reaction and not simply as end products of oxidative degradation processes. It has been found that at reaction times close to zero one tetrahydrofuran molecule may be attacked in one or several carbon atoms. 65.9% of tetrahydrofuran consumed in the first stages of the reaction forms succinic acid through a mechanism in which one molecule of fuel is attacked by two molecules of oxygen. More than 20% of the tetrahydrofuran molecules are attacked at least by three molecules of oxygen.
The gas-phase oxidation of 1.3-dioxolan was investigated over the temperature range 240-340 "C below atmospheric pressure by the static method. Explosion and cool-flame limits were determined and the kinetic constants of the slow reaction were measured. Gas chromatography was used for analysis of all products except peroxides.These were investigated by means of spectrophotometry and thin-layer chromatography. A mechanism is suggested in which I ,3-dioxolan 2-hydroperoxide and 4-hydroperoxide are degenerate branching agents below 300 "C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.