IDENTIFICATION OF BURNT SMELL COMPOUNDS AND GENERAL REACTION PRODUCTS AFTER THERMAL DECOMPOSITION PROCESS OF DEFINED COMBINED MATERIALS

Fajar Inggit Pambudi, Dwi Siswanta

2014 | Disertasi | PROGRAM STUDI S2 ILMU KIMIA

The eleven burnt smell compounds and general reaction products after thermal decomposition processes of defined combined materials have been investigated. The identification of the thermolysis products was based on three defined parameters that were the proportion of the materials, the gaseous environment, and the residence time in the furnace. The mixture of polypropylene and polyethylene terephthalate (PP : PET) as well as polypropylene and pine wood (PP : pine wood) was used as the input materials in defined combination. The experiments were done by using laboratory-scale combustion device. Synthetic air and pure nitrogen were used as the gaseous environment and they were applied to differentiate between combustion and pyrolysis experiments. The gases released from the thermolysis experiments were sampled by using headspace-SPME method to identify the burnt smell compounds. Subsequently, the SPME fiber was injected into the GC/MS system in selected ion monitoring mode. The general reaction products were determined by injecting acetone which contained the trapped gases in GC/MS in scan mode. The results showed that the different proportion of the mixed materials affected the distribution as well as the proportion of the burnt smell compounds and the general reaction products. In different gaseous environment, the proportion of naphthalene became the main difference between combustion and pyrolysis experiments, while the other burnt smell compounds remained relatively the same in proportion. The effect of different residence time by combustion and pyrolysis could be observed in several general reaction compounds. In a short residence time, several compounds such as PAH, alkanes, alkenes, oxygen carrying hydrocarbons, and BTEX were influenced. In case of the burnt smell compounds, the different of residence time did not likely affect their distribution.

Kata Kunci : Thermal decomposition, combined materials, burnt smell compounds, general reaction products, headspace-SPME, GC/MS