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The behaviour of fuel-nitrogen during fast pyrolysis of polyamide at high temperature

2000; Elsevier BV; Volume: 55; Issue: 2 Linguagem: Inglês

10.1016/s0165-2370(00)00075-9

1873-250X

Jean-Noël Leichtnam, Dominique Schwartz, Roger Gadiou,

Toxic Organic Pollutants Impact

In order to predict the formation of nitrogen oxides during the incineration of plastic wastes such as nylons, it is important to quantify the nitrogen containing species which are formed during the primary thermal degradation of the fuel. A study of the pyrolysis of 6-6 polyamide was done in an horizontal quartz reactor, with the temperature was ranging between 1073 and 1273 K, and the residence time of the evolved species in the hot zone of the reactor between 0.28 and 1.7 s. The analysis of the volatile products was done with on-line chemi-luminescent, infrared, or FTIR analysers. Light hydrocarbons, carbon oxides, and nitrogen containing species were identified and quantified. Results show that HCN emission increases with temperature and residence time, while NH3 seems to be less influenced by these two parameters. CO and light hydrocarbons follow the evolution of HCN, and CO2 exhibits the same behaviour as ammonia. These differences can be explained by two competing mechanisms, the first taking place at low temperature to yield carboxylic acids and amines, and the second observed at higher temperature and leading to the formation of nitriles.