Formation of Oxygenated Compounds (Aldehydes,Alcohols,Organic Acids) from Propane Flames

Abstract

The formation of three families of oxygenated compounds (carbonyl compounds, alcohols, and organic acids) was studied in the case of propane combustion. Stoichiometric, lean and rich conditions are studied at different distances from a flat burner. Fifteen hydrocarbons, eight carbonyl compounds, three alcohols, and three organic acids are found in the combustion products under the experimental conditions used. Generally, these oxygenated compounds are formed very quickly, their concentrations increase in the first 2–3 mm and then fall to zero. The influence of λ is also presented: some oxygenated compounds have a maximum concentration at stoichiometry, while others are under lean conditions. This influence is generally the same as in the case of a spark ignition engine. Hydrocarbons represent the major part of the intermediate products (propane excepted), but the percentage of oxygenated compounds is quite important to be neglected.