Liquefaction thermal conductivity

A Perkin-Elmer Auto-system gas chromatograph (GC), which houses a 30-m, 0.53-mm (ID) fused silica capillary column (Carboxen 1010 Plot, Supelco), was used to analyze the gaseous samples from the liquefaction process. Temperature programmed step heating was performed as follows 40°C for 1.7 min, increase by 40°C/min imtil 220°C, and leave at 220°C for 1.8 min. Argon was the carrier gas at a flow rate of 20 ml/min. Two detectors were used for gas analysis a flame ionization detector (FID) for carbon-bearing species and a thermal conductivity detector (TCD) for H2. Uncertainties in reported concentrations are estimated to be within 5% [8]. 

A number of basic studies in the area of donor solvent liquefaction have been reported (2 -9). Franz (10J reported on the interaction of a subbituminous coal with deuterium-labelled tetra-lin, Cronauer, et al. (11) examined the interaction of deuterium-labelled Tetralin with coal model compounds and Benjamin, et al. (12) examined the pyrolysis of Tetralin-l-13C and the formation of tetralin from naphthalene with and without vitrinite and hydrogen. Other related studies have been conducted on the thermal stability of Tetralin, 1,2-dihydronaphthalene, cis-oecalin and 2-methylin-dene (13,14). 

Both liquefaction residues were studied by DSC in both inert (dynamic N2) and oxidizing (dynamic air) atmospheres. A computerized DSC system (Perkin-Elmer DSC-2C/TADS) was used in these studies, A flow-thru cover was used with the DSC sample holder asjsembly in all of these studies. Standard gold sample pans were employed for the oxidative profiles obtained in dynamic air atmosphere. For the lower temperature studies conducted in dynamic N2 atmosphere, experiments showed that the results obtained were the same regardless of whether standard aluminum or standard gold DSC pans were employed. All figures given here are hard copy printouts from the Perkin-Elmer Thermal Analysis Data Station. 

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