Corona-discharge reactor

Figure 4. Most studied electrode geometry in liquid corona discharge reactors (A) point-to-plane and (B) plate-to-plane.

Based on data from a laboratory-scale study, preliminary costs for capital and operating and maintenance (O M) expenses were estimated for a corona discharge reactor that could treat water containing 4200 parts per billion (ppb) of carbon tetrachloride (with a flow rate of 25 gpm). The liquid corona technology s O M costs were 50% lower than those of the air-stripping/granular activated carbon (GAC) process and were 74% lower than those of the ultraviolet(UV)/oxidation process (D11866L, pp. 1030-1031). 

Marafee, A., C.-J. Liu, G. Xu, R.G. Mallinson, L. Lobban. (1997). An experimental study on the oxidative coupling of methane in a direct current corona discharge reactor over Sr/La203 catalyst. Industrial Engineering Chemistry Research 36 632-637. 

Separation via ionization in gas/vapor phase laser excitation of isotopes, electron attachment in a corona-discharge reactor... 

Figure 7.3.7. (a) Exploded view of the AVUS device for uranium isotope separation, (b) Electron attachment based gas purification in a corona-discharge reactor (see equations (7.3.30a, b)). (After Tamon et al. (1995).)... 

Corona discharge is the simplest type of plasma generator. A feature of the corona discharge, which differentiates it from the other discharges, is that no dielectric is involved. Instead, an electron avalanche is initiated from a sharp metallic surface where the radius of curvature is small. The electric field has to be pulsed in order to prevent the plasma from going into the thermal mode and forming an arc. The electric field in corona reactors is about 50 kV/cm. 

Kim, Y.-H. and Hong, S.H. (2002) Two-dimensional simulation images of pulsed corona discharges in a wire-plate reactor, IEEE Trans. PI. Sci. 30, 168-9. 

Kanazawa, S., Sumi, T., Shimamoto, S. et al. (2004) Diagnostics of NO oxidation process in a nonthermal plasma reactor Features of DC streamer-corona discharge and NO LIF profile, IEEE Trans. PI. Sci. 32, 25-31. 

Electrosynthesis gives a good concentration for pulp bleaching but the scale-up of electrosynthesis reactors to the range of 1 ton/day of ozone is problematic. The capital and operating costs probably make electrosynthesis uncompetitive with the corona discharge process [129],... 

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