No abstract

No abstract

these products formed from the supercritical water oxidation of phenol are also formed from phenol incineration (13)(14)(15)(16)(17)(18). This observation suggests that there may be a relationship between the two thermal oxidation processes, even though supercritical water oxidation operates at much lower temperatures and much higher pressures than does incineration.

No abstract

The results of a preliminary, proof-of-principle investigation of the sonochemical destruction of the chlorofluorocarbons CFC 11 (fluorotrichloromethane) and CFC 113 (trifluorotrichloroethane) in dilute aqueous solution are reported. The chlorofluorocarbon solutions with an initial concentration of approximately 50 mg/L of the CFC were exposed to 20-kHz ultrasound with a power per unit volume of either 4.6 W/mL in a batch reactor or 0.64 W/mL in a circulating reactor. Destruction was fairly rapid with very little, less than 5%, of the CFCs undergoing volatilization. Destruction rates were slightly higher at 5 "C than at 10 "C. This decrease in reaction rate with an increase in solution temperature is common in sonochemistry. The solution pH decreased upon sonication, indicating the acidic species as a final halogen acceptor for at least a portion of the C1 and F.