Yilan oil shale organic matter was depolymerized by sequential thermal dissolution in tetralin.The soluble portions (SP) were analyzed by GC-MS and classified into different components

and the residues were analyzed by FT-IR and 13C NMR.Based on the above information

Yilan oil shale organic molecular structure was revealed at a molecular level.The results indicated that Yilan oil shale organic matter could be depolymerized by sequential thermal dissolution from 200℃ to 400℃

the yields of soluble portions at 200

300

350

375 and 400℃ were 8.8%

9.9%

18.5%

19.2% and 23.4%

respectively

and the total yield was 79.8%.In the total soluble fraction

aliphatic hydrocarbon compounds accounted for more than 36.9%(including 27.4%n-alkanes and 8.7% branched alkanes)

alcohols/phenol 5.5%

aromatic hydrocarbon 32.0%

ketones 12.7%

ether/ester 5.4%

and the other compounds 7.5%.The order of yield of compounds is as follow:aliphatic hydrocarbons > aromatic compounds > ketones > phenols > alcohols/esters.The identified n-alkanes in soluble portions have a distribution range from C14 to C30 with two maximum values at C16 and C26.