Composition of nitrogen-containing compounds in oil obtained from acrylonitrile-butadiene-styrene thermal degradation

The thermal degradation of the acrylonitrile-butadiene-styrene copolymer (A BS) was carried out at different temperatures from 360 to 440 degrees C in static and dynamic atmospheres of nitrogen, using semibatch operation. Nitr ogen-containing compounds were found in all three degradation fractions: ga ses (as NH3 and HCN), oil, and residue. The percentage of the oil fraction increases with the increase of the degradation temperature. At 440 degrees C 63 wt % of the initial ABS feed was recovered in the oil fraction. The ni trogen (N) concentration of the oil fraction was in the range of 29-40 mg/m L. 4-Phenylbutyronitrile is the main N-containing degradation product (16-1 9 wt % in oil). N-compounds were also found as aliphatic and aromatic nitri les, amino derivatives, and heterocyclic compounds containing one or two N atoms such as pyridine, pyrimidine, and quinoline. Dynamic atmospheres of n itrogen and the residence time of the products in the reactor affects the o il recovery rate and the distribution of N in the degradation products.