Thermogravimetric kinetic model of the combustion of a varnish waste basedon polyurethane

A kinetic study of the combustion of a varnish waste based on polyurethane was carried out by thermogravimetric analysis (TGA). Different runs were pe rformed at heating rates between 5 and 20 degreesC min(-1) and oxidizing at mospheres with a percentage of oxygen between 10 and 33.3% (v/v). A correla tion model that considers four reactions: pyrolysis of solid, oxidation of the solid, and combustion of the residues generated in both previous reacti ons was applied to simulate the process. The model proposed satisfactorily fits the available experimental data.