To study the efficiency of the removal of vapors of volatile organic compounds from air flows when processed by a plasma of pulsed discharges, a method of competing reactions is proposed. Using a compound with known parameters in the model mixture, it is possible to estimate similar parameters of other compounds using a chromatographic method of analysis that does not have a high temporal resolution. By the example of styrene and methyl methacrylate vapors, it was shown that for unsaturated compounds their relative reactivity in the discharge plasma correlates well with the ratio of the rate constants of their reactions with ozone.
Based on the method of competing reactions, a method for determining the relative reactivity of aromatic vapors in relation to the plasma components of a pulsed corona discharge is developed. The parameters of the relative reactivity of aromatic compounds in the air and nitrogen stream were obtained using model mixtures based on benzene, toluene, and xylene with a content of 250-500 ppm. The effect of water vapor on the process is shown. The obtained data will be useful for optimizing the processes of plasma-chemical air purification from the vapors of toxic aromatic compounds.
The article discusses ways to increase the efficiency of ozone production in a coaxial chamber using a pulsed corona discharge. The effect of the discharge gap and the diameter of the potential electrode on the energy efficiency of ozone production using a pulsed corona discharge of negative polarity with a duration of 40 ns and a voltage of about 100 kV was investigated. It is shown that with an increase in the discharge gap, the productivity of the installation decreases, and the energy efficiency increases. The optimal diameter of the potential electrode has a value of about 0.64 mm. This information will be useful in the development of highly efficient ozonators and in optimizing the parameters of plasma chemical reactors for air purification by electro-discharge methods
A study was made of the relative reactivity of vapors of a number of acetic acid esters (alkyl acetates) with respect to plasma components of a pulsed corona discharge with a voltage of 100 kV and a duration of 40 ns. On model mixtures based on methyl-, ethyl-, propyl-, isopropyl, isobutyl-, butyl-, and vinyl acetate with a content of 250–500 ppm in air and nitrogen, the relative reactivity parameters were obtained. The reactivity of acetic acid esters increases with an increase in the hydrocarbon substituent. The high reactivity of vinyl acetate is due to the double bond reaction with ozone.
The effect of the target material and the size of the irradiated volume on the efficiency of ozone synthesis in air under the action of a pulsed electron beam is investigated. Graphite and lead targets were used. The highest concentration of ozone was observed in a chamber without a target, and the highest specific ozone yield without consideration of electron reflection (230 g(kWh)–1) was observed in a chamber with a lead target at a minimum air gap (3 cm). The results are explained by the processes of multiple reflection of electrons from elements with a high atomic number at small air gaps compared to the size of the target.
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.