Resumen de Incineración mejorada de compuestos orgánicos volátiles mediante peróxido de hidrogeno: Modelamiento cinético
The addition of hydrogen peroxide (H202) into a stream of heated oír containing volatile organic compounds (VOCs), such as heptane and chlorobe nzene, has been found to increase the destruction of !hose VOCs. Detaile_d kinetic models for the enhonced incineration of heptane (44 chemical species, 144 reactions), and chlorobenzene (62 species, 212 reactions) were developed. The computer code CHEMKlN was used for the model simulations, and sensitivity anofyses were performed using the SENKIN code. Ádditional thermodynamic data needed for the model were colculated using the group addition method of Benson, and the computer code THERM. lt was concluded that the H202 enhancement effect in the oxidation of heptane occurs by the thermal dissociation of the peroxide molecule, providing two OH• radicals, followed by hydrogen abstraction of the heptane molecule by the OH• radicals. In the un enhanced case, the key reaction is the thermal dissociation of the heptone molecule into two radicals. For chlorobenzene, the major VOC destruction pathway seems to be the attack of an H02• to generaie the phenoxy radical. The H02• radicals are indirectly supplied by the peroxide through OH• radical attack on other H202 molecules, and by other downstream reactions. This is a plaus i ble explonation for the experimental obsevation of the need of much higher concentrations of H202 with chlorobenzene than with heptane, ond for the apparent deloy in the destruction of chlorobenzene.
