Emission of Polycyclic Aromatic Hydrocarbons on the Combustion of Liquid Crystal Display Components

This study investigated the kinetics and emission factor for 16 USEPA priority polycyclic aromatic hydrocarbons (PAHs) on the combustion of liquid crystal display components. In addition, chemical characteristics and structure of the liquid crystal sample were also investigated. The evaporation and gas diffusion of liquid crystals occur in the early stage of the combustion process (at <545 K). Continuously, the liquid crystal molecules may be oxidized to form CO2, CO, CH4, C2H6, and PAHs. The activation energy (18.9 Kcal/mol), preexponential constant (10^13.9 L/min) and reaction order (3.1) of the combustion of liquid crystal display components were also determined. On the other hand, the analytic results indicated that the emission factor for 16 USEPA priority PAHs in particulate and gas phase is not determined (n.d.)-25.19 and n.d.-31.48 (mu)g/g, respectively. The emission factor is approximately 390 and 1,520 times higher, respectively, than that of waste terephthalic acid and biological sludge combustion. Results of this work suggest that the combustion of liquid crystal display components should emphasize the air pollution control.