Extraction At Room Temperature And Fractionated Thermal Dissolution Of Zaozhuang Bitumite And Xinghe Lignites

The Zaozhuang bituminous coal(ZBC) and Xinghe lignite(XL) were selected as the coal sample. Firstly, two coal samples were extracted with petroleum ether, carbon disulfide, methanol, acetone and isometric acetone/carbon disulfide mixture at room temperature; Secondly, thermal dissolution(TD) of the residues with cyclohexane at 200 oC, 230 oC, 260 oC, 290 oC and 320 oC. Finally, Cyclohexane insoluble residues were fractionated thermal dissolved with benzene, methanol, ethanol and isopropanol at 320 oC, respectively. Anthracene was chosen as an acceptor of active hydrogen to prove whether there is a hygrogen transfer existing in TDP.The yield of extraction of ZBC was 15.59%, much higher than that of XL at room temperature. Straight chain was dissolve by the winding of petroleum ether embedded in the network structure of the coal, and ????were damaged by carbon disulfide and acetone between aromatic hydrocarbons.With the increase of temperature, the yield of TDPs with cyclohexane decreased at first and then increased, which may be due to the first process was thermal extraction, following the small molecular compounds was completely dissolved, thermal dissolution yield decreased gradually, while the temperature continue to rise, thermal dissolution yield increased with the pyrolysis of the coal.The formation of phenols could be attributed to the interaction between methanol and Caryl-O bonds. Compared to the phenomenon above, a series of normal ethyl alkanoates were found in SPZBC-E. The interaction between ehanol and oxygen bridge bond is stronger than that between methanol and oxygen bridge bond. The oxygen atom in ethanol could attact Cacyl, resulting ethyl esters and another alcohol.HT is relatively weak in benzene thermal dissolution process and the activated hydrogen may derived from pyrolysis. While, HT in alcohols at 320 oC is effective. Transesterification and the interaction between alkyloxybenzene with alcohols may be the major source of the activated hydrogen.