Study of pyrolysis performance of sulfur compounds in residual oil by pyrolysis-gas chromatography

High temperature pyrolysis gas chromatography(PY-GC) has been used to investigate the pyrolysis performance of sulfur compounds in residual oil.On the basis of optimization of a series of(PY-GC) experiment conditions,the pyrolysis chromatograms which could reflect the composition and structure of sulfides in residue were obtained.Then the pyrolysates were characterized by comparing to a series of standard sulfur compounds and referring to literature.It was found that the sulfur compounds in pyrolysates mainly consisted of H2S,thiophene,benzothiophene and dibenzothiophene species of compounds.According to the(PY-GC) analysis result of model compounds,it was estimated that H2S was not only from the sulfide structure,but also from thiophene,benzothiophene and dibenzothiophene structures.In addition,thiophene,BT and DBT series of compounds in the pyrolysates were mainly from the large molecules of thiophene,BT and DBT compounds of the heavy oil.