Mm. Esperanza et al., Toxic byproducts from the combustion of varnish wastes based on polyurethane in a laboratory furnace, J HAZARD M, 77(1-3), 2000, pp. 107-121
Varnish wastes based on polyurethane were burnt in a laboratory scale furna
ce at different residence time of gases and temperatures and with a fuel-ri
ch atmosphere and with an excess of oxygen. The yields of CO, CO2, six ligh
t hydrocarbons (methane, ethylene, etc.) and 31 semivolatile + volatile com
pounds (benzene, toluene, naphthalene, dibezofuran, etc,) were determined w
ith stoichiometric: factors of the oxygen between 0.6 and 0.9, nominal temp
eratures of the reactor between 750-1050 degrees C and residence times of t
he volatiles evolved and formed between 2 and 6 s. The collection of the vo
latiles evolved was carried out with a Tedlar bag and by XAD-4 resin, compa
ring the data obtained in both cases. The maximum emission factors or yield
s of volatiles + semivolatiles were obtained at 850-950 degrees C, with val
ues above 0.5% for benzene, naphthalene, acenaphthylene, phenantrene and fl
uoranthene. The thermal behaviour of different compounds was analysed. Naph
thalene, benzene and toluene were also detected in the excess oxygen runs.
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