Fractionation of liquefaction products
The gas products were analyzed by Algien 7890 A gas chromatograph. The solid and liquid products were extracted by hexane,
benzene and tetrahydrofuran (THF), here the reagents (bought from
Guangfu Fine Chemical Research Institute of Tianjin, China) are
all analytically pure agents. After extraction, the products were
separated into oils (hexane soluble), asphaltene (hexane insoluble but benzene soluble), preasphaltene (benzene insoluble but
tetrahydrofuran soluble), and residues (tetrahydrofuran insoluble)
as shown in