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K ADDITIONAL DATA AND MATERIAL BALANCES FOR WET AIR OXIDATION, SUPERCRITICAL WATER 279 OXIDATION, AND THE SYNTHETICA DETOXIFIER K Additional Data and Material Balances for Wet Air Oxidation, Supercritical Water Oxidation, and the Synthetica Detoxifier WET AIR OXIDATION An approximate material balance has been calculated with estimates for the size of equipment and the product streams. The numbers are based on the following: ⢠feed: 1,000 kg of GB; ⢠oxygen: 25 percent excess over theoretical; ⢠enriched air: O2/N2 = 1/1; ⢠NaOH added to produce a 3 M solution after reaction (this large an excess of NaOH may not be needed.); ⢠20 percent of C-H in the feed is left as sodium acetate; and ⢠the CO2 content of the gas is an estimate and is not based on equilibrium with liquid. Feed: ⢠GB: 1,000 kg (7.14 kg mol) ⢠Water: 19,000 (1056 kg mol) ⢠NaOH: 4,770 (119.2 kg mol) ⢠O2: 50.7 kg mol ⢠N2: 50.7 kg mol Gas phase: ⢠O2: 16.0 percent by volume (dry basis) ⢠N2: 81.7 percent by volume ⢠CO2: 2.3 percent by volume ⢠CO: 500 ppm
K ADDITIONAL DATA AND MATERIAL BALANCES FOR WET AIR OXIDATION, SUPERCRITICAL WATER 280 OXIDATION, AND THE SYNTHETICA DETOXIFIER ⢠Hydrocarbons: 500 ppm ⢠Volume (dry basis): 62.1 kg tool = 1.52 à 103 m3 @ P = 1 bar and T = 25°C ⢠H2O in gas phase at reactor conditions kg mol Liquid phase: ⢠H2O: 19,118 kg ⢠NaF: 300 kg ⢠Na3PO4: 1,171 kg ⢠Na2CO3: 2,271 kg ⢠CH3COONa: 234 kg ⢠NaOH: 1.799 kg 24,893 kg Reactor volume (assuming feed = 1,000 kg GB/day, 0.5 V/h/V): ⢠2.6 m3 ⢠(i.e., length = 7 m; diameter = 0.68 m) The calculations demonstrate that the volumes of material to be handled and the inorganic residue are many times greater than the volume of original agent to be destroyed. The calculations also demonstrate that it would be quite practical to operate as a closed system with material released from the process only after analysis. For example: ⢠basis: 1,000 kg GB/day; ⢠liquid holdup for 8 hours retention time = 8,300 kg (approximately 8 m3); and ⢠gas holdup for 8 hours retention, at 25°C and 60 bars (typical pressure): 8.4 m3 (dry basis). Holdup volumes of both liquid and gas for 8-hour retention times are modest. The compositions shown above will change under upset conditions. ⢠A low inlet temperature will quench the reaction, leading to little oxygen consumption and little organic destruction. ⢠A high inlet temperature will yield more complete oxidation to CO2 and H2O and possibly an undesirable temperature excursion.
