Devdopment of the Monolith Froth Reactor for Catalytic Wet Oxidation of CELSS Mo_
The aqueous phase oxidation of acetic acid, used as a model compound for the treatment of CELSS (Controlled Ecological Life Support System) waste, was carried out in the monolith froth reactor which utilizes two-phase flow in the monolith channels. The catalytic oxidation of acetic acid was carried out over a Pt/AI.,O_ catalyst, prepared at The University of Tulsa, at temperatures and pressures below the critical point of water. The effect of ex'temally controllable parameters (temperature, liquid flow rate, distributor plate orifice size, pitch, and catalyst distance from the distributor plate) on the rate of acetic acid oxidation was investigated. Results indicate reaction rate increased with increasing temperature and exhibited a maximum with respect to liquid flow rate. The apparent activation energy calculated from reaction rate data ,,,,,as 99.7 kJ/mol. This value is similar to values reported for the oxidation of acetic acid in other systems and is comparable to intrinsic values calculated for oxidation reactions. The "kinetic data were modeled using simple power law kinetics.
Oxidation of sewage with air at elevated temperatures
Abstract The possibility of oxidizing sewage with air at elevated temperatures has been investigated in the laboratory using rocking autoclaves. Most of the carbon compounds present were oxidized quite rapidly at 300°–400°C; this was confirmed in experiments with solutions of the individual compounds. Acetate was rather refractory to oxidation and constituted an important fraction of carbonaceous matter remaining after autoclaving sewage with excess air. Organic nitrogen present was converted to ammonia which was completely resistant to oxidation with air at 300°–400°C.
Selective hydrogenation and mass transfer in a fixed‐bed catalytic reactor with gas‐liquid concurrent upflow
Reaction rates of selective hydrogenation of phenylacetylene (PA) and styrene were studied in a packed-bed reactor with concurrent gas and liquid upflow. The surface reaction rates were expressed by the reaction between adsorbed PA or styrene and dissociated hydrogen atoms competing for the same active sites. The contributions of mass transfer rate were determined, and better selectivity conditions were discussed.