Treatment of 2-chlorophenol aqueous solutions by wet oxidation.
In the present work, the wet oxidation (WO) of 2-chlorophenol (2-CP) was studied in aqueous solutions, in a high-pressure agitated autoclave reactor. Specifically, the effect of temperature (160-190 degrees C), oxygen partial pressure (5-40 bar) and 2-CP initial concentration (250-1500 mg L(-1)) was examined. The process was attended via total organic carbon (TOC), 2-CP, chloride ion, acetic acid, formic acid and pH measurements. Significant rates of 2-CP disappearance and TOC removal were achieved above 170 degrees C. A decrease in 2-CP initial concentration below 1000 mg L(-1) resulted in a dramatic decrease in the TOC removal achieved, whereas an increase in oxygen partial pressure enhanced greatly the decontamination of the 2-CP aqueous solution, especially from 10 to 20 bar. Much attention was given on the chloride ion removal from the phenolic ring in order to attend the dechlorination of 2-CP during WO. In the WO process, the majority of chloride ions were detached from organic compounds. Finally, a parallel and in series reaction scheme has been proposed for the interpretation of the experimental results.
Poulopoulos
S G
SG
Chemical Process Engineering Laboratory, School of Chemical Engineering, National Technical University of Athens, Heroon Politechniou 9, Zographou Campus, 157 80 Athens, Greece.
Korologos
C A
CA
Boulamanti
A
A
Philippopoulos
C J
CJ
D002733:Chlorophenols / Q000737:chemistry*; D006358:Hot Temperature; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010313:Partial Pressure; D012996:Solutions / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D002733:Chlorophenols; D012996:Solutions; C030683:2-chlorophenol; D010100:Oxygen