Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors

Anand G. Chakinala, Parag R. Gogate, Rashmi Chand, David H. Bremner, Raul Molina, Arthur E. Burgess

Research output: Contribution to journalArticle

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Abstract

The effect of the presence and absence of the chloroalkanes, dichloromethane (CH2Cl2), chloroform (CHCl3) and carbon tetrachloride (CCl4) on the extent of oxidation of aqueous I- to I3- has been investigated in (a) a liquid whistle reactor (LWR) generating hydrodynamic cavitation and (b) an ultrasonic probe, which produces acoustic cavitation. The aim has been to examine the intensification achieved in the extent of oxidation due to the generation of additional free radicals/oxidants in the reactor as a result of the presence of chloroalkanes. It has been observed that the extent of increase in the oxidation reaction is strongly dependent on the applied pressure in the case of the LWR. Also, higher volumes of the chloroalkanes favour the intensification and the order of effectiveness is CCl4> CHCl3 > CH2Cl2. However, the results with the ultrasonic probe suggest that an optimum concentration of CH2Cl2 or CHCl3 exists beyond which there is little increase in the extent of observed intensification. For CCl4, however, no such optimum concentration was observed and the extent of increase in the rates of oxidation reaction rose with the amount of CCl4 added. Stage wise addition of the chloroalkanes was found to give marginally better results in the case of the ultrasonic probe as compared to bulk addition at the start of the run. Although CCl4 is the most effective, its toxicity and carcinogenicity may mean that CH2Cl2 and CHCl3 offer a safer viable alternative and the present work should be useful in establishing the amount of chloroalkanes required for obtaining a suitable degree of intensification.
Original languageEnglish
Pages (from-to)164-170
Number of pages7
JournalUltrasonics Sonochemistry
Volume15
Issue number3
DOIs
StatePublished - Mar 2008

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Chakinala, A. G., Gogate, P. R., Chand, R., Bremner, D. H., Molina, R., & Burgess, A. E. (2008). Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors. Ultrasonics Sonochemistry, 15(3), 164-170. DOI: 10.1016/j.ultsonch.2007.02.008

Chakinala, Anand G.; Gogate, Parag R.; Chand, Rashmi; Bremner, David H.; Molina, Raul; Burgess, Arthur E. / Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors.

In: Ultrasonics Sonochemistry, Vol. 15, No. 3, 03.2008, p. 164-170.

Research output: Contribution to journalArticle

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Chakinala, AG, Gogate, PR, Chand, R, Bremner, DH, Molina, R & Burgess, AE 2008, 'Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors' Ultrasonics Sonochemistry, vol 15, no. 3, pp. 164-170. DOI: 10.1016/j.ultsonch.2007.02.008

Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors. / Chakinala, Anand G.; Gogate, Parag R.; Chand, Rashmi; Bremner, David H.; Molina, Raul; Burgess, Arthur E.

In: Ultrasonics Sonochemistry, Vol. 15, No. 3, 03.2008, p. 164-170.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors

AU - Chakinala,Anand G.

AU - Gogate,Parag R.

AU - Chand,Rashmi

AU - Bremner,David H.

AU - Molina,Raul

AU - Burgess,Arthur E.

PY - 2008/3

Y1 - 2008/3

N2 - The effect of the presence and absence of the chloroalkanes, dichloromethane (CH2Cl2), chloroform (CHCl3) and carbon tetrachloride (CCl4) on the extent of oxidation of aqueous I- to I3- has been investigated in (a) a liquid whistle reactor (LWR) generating hydrodynamic cavitation and (b) an ultrasonic probe, which produces acoustic cavitation. The aim has been to examine the intensification achieved in the extent of oxidation due to the generation of additional free radicals/oxidants in the reactor as a result of the presence of chloroalkanes. It has been observed that the extent of increase in the oxidation reaction is strongly dependent on the applied pressure in the case of the LWR. Also, higher volumes of the chloroalkanes favour the intensification and the order of effectiveness is CCl4> CHCl3 > CH2Cl2. However, the results with the ultrasonic probe suggest that an optimum concentration of CH2Cl2 or CHCl3 exists beyond which there is little increase in the extent of observed intensification. For CCl4, however, no such optimum concentration was observed and the extent of increase in the rates of oxidation reaction rose with the amount of CCl4 added. Stage wise addition of the chloroalkanes was found to give marginally better results in the case of the ultrasonic probe as compared to bulk addition at the start of the run. Although CCl4 is the most effective, its toxicity and carcinogenicity may mean that CH2Cl2 and CHCl3 offer a safer viable alternative and the present work should be useful in establishing the amount of chloroalkanes required for obtaining a suitable degree of intensification.

AB - The effect of the presence and absence of the chloroalkanes, dichloromethane (CH2Cl2), chloroform (CHCl3) and carbon tetrachloride (CCl4) on the extent of oxidation of aqueous I- to I3- has been investigated in (a) a liquid whistle reactor (LWR) generating hydrodynamic cavitation and (b) an ultrasonic probe, which produces acoustic cavitation. The aim has been to examine the intensification achieved in the extent of oxidation due to the generation of additional free radicals/oxidants in the reactor as a result of the presence of chloroalkanes. It has been observed that the extent of increase in the oxidation reaction is strongly dependent on the applied pressure in the case of the LWR. Also, higher volumes of the chloroalkanes favour the intensification and the order of effectiveness is CCl4> CHCl3 > CH2Cl2. However, the results with the ultrasonic probe suggest that an optimum concentration of CH2Cl2 or CHCl3 exists beyond which there is little increase in the extent of observed intensification. For CCl4, however, no such optimum concentration was observed and the extent of increase in the rates of oxidation reaction rose with the amount of CCl4 added. Stage wise addition of the chloroalkanes was found to give marginally better results in the case of the ultrasonic probe as compared to bulk addition at the start of the run. Although CCl4 is the most effective, its toxicity and carcinogenicity may mean that CH2Cl2 and CHCl3 offer a safer viable alternative and the present work should be useful in establishing the amount of chloroalkanes required for obtaining a suitable degree of intensification.

U2 - 10.1016/j.ultsonch.2007.02.008

DO - 10.1016/j.ultsonch.2007.02.008

M3 - Article

VL - 15

SP - 164

EP - 170

JO - Ultrasonics Sonochemistry

T2 - Ultrasonics Sonochemistry

JF - Ultrasonics Sonochemistry

SN - 1350-4177

IS - 3

ER -

Chakinala AG, Gogate PR, Chand R, Bremner DH, Molina R, Burgess AE. Intensification of oxidation capacity using chloroalkanes as additives in hydrodynamic and acoustic cavitation reactors. Ultrasonics Sonochemistry. 2008 Mar;15(3):164-170. Available from, DOI: 10.1016/j.ultsonch.2007.02.008