Monitoring coal-tar pitch composition changes during air-blowing by gas chromatography.
A series of air-blown coal-tar pitches was studied by GC and GC-MS in order to achieve a deeper understanding of the behaviour of the different pitch components during air-blowing. Compounds present in the parent pitch were identified and quantified and then compared to those present in the air-blown pitches. The compounds observed were identical before and after the treatments, but the concentration of each compound changed with the treatment to a different extent depending on its molecular structure and consequently its reactivity to oxygen. The most reactive compounds were those with a mehylene-bridge in a five member ring, followed by those with a methyl group in their structure.
Domínguez
A
A
Instituto Nacional del Carbón, CSIC, Apartado 73, 33080 Oviedo, Spain. padilla@incar.csic.es
Blanco
C
C
Santamaría
R
R
Granda
M
M
Blanco
C G
CG
Menéndez
R
R
D000388:Air; D003033:Coal Tar / Q000032:analysis / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D015394:Molecular Structure; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry
D011084:Polycyclic Aromatic Hydrocarbons; D003033:Coal Tar