PROPERTIES AND MOLECULAR STRUCTURE OF PITCHES FROM COPYROLYSIS PRODUCTS OF GOYNUK OIL SHALE AND AVGAMASYA ASPHALTITE

摘要

Pitch is a complex material comprised of thousands of components, mainly polyaromatic hydrocarbons and their heterocyclic analogs. Due to the complexity of pitch, very few analytical techniques provide much information about composition. However, size exclusion chromatography (SEC) is a valuable analytical technique for the analysis of complex materials such as pitches. SEC separates molecules based on size, but with appropriate calibration procedures, can be used to provide molecular weight distribution data for pitch materials [2].1-methyl-2-pyrrolidinone (NMP) offers a number of advantages as a mobile phase. Much more material is dissolved in NMP and solute-column packing interactions common with SEC solvents such as tetrahyrdofuran (THF) are much reduced. In this study, the molecular structure of pitches produced by air-blowing, N_2-blowing, and vacuum distillation of tars derived from copyrolysis of Goynuk oil shale (GOS) and Avgamasya asphaltite (AA) are characterised by different analytical techniques.