Gas phase reactions of unsaturated esters with Cl atoms

Abstract

Product analysis should be necessary in order to evaluate the real environmental impact of these reactions. OH and ozone reactions of most of the considered compounds have already been studied and products determined, but kinetic and products information for NO(3) radical reactions is especially scarce.

FTIR gas-phase kinetic study of the reactions of Cl atoms with (CH3)2CCHC(O)H and CH3CHCHC(O)OCH3

“…The value obtained in this study for the reaction of Cl atoms with methyl crotonate of k 2 = (2.04 ± 0.56) Â 10 À10 cm 3 molecule À1 s À1 is in good agreement, within the experimental error, with that recently reported by Martín et al [8] of k 2 = (2.21 ± 0.17) Â 10 À10 cm 3 molecule À1 s À1 determined relative to the reactions of Cl with cyclohexane and n-pentane in (708 ± 8) Torr of N 2 at (298 ± 2) by CG-FID analysis.…”

“…In this work, we report room temperature relative kinetic determinations of the rate coefficients for the reactions of Cl atoms with b,b-dimethylacrolein and methyl crotonate performed in a photoreactor at atmospheric pressure of air: The reaction of methyl crotonate with Cl atoms has only been studied previously by Martín et al [8] in a collapsible Teflon chamber with gas chromatography detection of the organics at atmospheric pressure and room temperature.…”

Tropospheric Photo-oxidation of Ethyl Methacrylate Initiated by Cl Atoms in the Gas Phase: Kinetic and Mechanistic Investigations

“…Both the rate coefficients show reasonable agreement with each other within the experimental uncertainty. They also show a good degree of agreement with the rate coefficient reported by Porrero et al [(2.71 ± 0.21) × 10 –10 cm 3 molecule –1 s –1 ], given the experimental uncertainty. The maximum difference between the obtained and reported rate coefficients is calculated to be 3%.…”

“…Several studies have been performed to investigate the rate coefficients of EMA with OH and NO 3 radicals, O 3 molecules and Cl atoms. − The rate coefficients for the reaction of EMA with OH radicals were measured by Ren et al in the temperature range of 257 to 376 K. They employed PLP-LIF to obtain the rate coefficients and reported as (4.25 ± 0.54) × 10 –12 exp[(726 ± 39)/ T ] cm 3 molecule –1 s –1 . They also measured the rate coefficient for the reaction of EMA with O 3 molecule at room temperature (298 K) using an atmospheric simulation chamber and reported it as (7.74 ± 0.41) × 10 –18 cm 3 molecule –1 s –1 .…”

“…The weighted average rate coefficients were reported as (4.67 ± 0.49) × 10 –15 cm 3 molecule –1 s –1 at 298 K. Salgado et al used RR method to find out the rate coefficient for the reaction of NO 3 radical with EMA at 298 K and reported as (5.42 ± 1.90) × 10 –15 cm 3 molecule –1 s –1 . Porrero et al measured the rate coefficient for the reaction of Cl atom with EMA at 298 K. They used the RR method and reported the rate coefficient as (2.71 ± 0.21) × 10 –10 cm 3 molecule –1 s –1 relative to n -heptane and cyclohexane. Blanco et al .…”