Structural study of hexane-soluble products from hydroliquefaction of three Yallourn brown coal lithotypes over molten salt catalysts
✍ Scribed by Masakatsu Nomura; Takeshi Yoshida; Paul Philp; Trevor Gilbert
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 664 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
The hexane-soluble fractions of hydroliquefied products from three Yallourn brown coal lithotypes have been separated into five fractions by combined silicaalumina packed column chromatography. Analyses of various fractions by g.c.-m.s. permitted the identification of ~50 components in the saturate fraction and 40 components in the diaromatic fraction, together with 30 components in the monoaromatics. The components identified were quite similar among hexane-soluble portions of all three lithotypes. A marked predominance of even carbon number alkane (C23-C29) was observed in the hydrocarbon fractions from pale lithotype over ZnCI,/KCI, and medium light lithotype over both pure ZnCI, and ZnCI,/KCI. However, medium dark lithotype over both melt catalysts produced a saturate fraction with an odd carbon number(C+C& preference. Based on spectral methods, Soxhlet extracts obtained from untreated lithotypes (hexane and benzene solubles) were characterized as complex mixtures of higher molecular weight(300-1000) aliphatic hydrocarbons, which were supposed to be a precursor of the saturates produced from the corresponding lithotype in the catalytic hydroliquefaction.