Abstract
In an extension of our previous work, similar experiments were conducted on the effect of coal nature on change of apparent viscosity of coal/tetralin slurry during liquefaction under 10.1 MPa hydrogen atmosphere and at heating and cooling rates mainly of 10 K /min. So far were employed six different coals with the size of-100 mesh and carbon content ranging from 65.8 to 86.6. For some coals a sharp peak, similar to the previous case for Akabira coal, was observed in the viscosity-time curve during heating. The peak height was well correlated with the weight ratio of quinoline soluble-benzene insoluble (QS-BI) fraction to benzene insoluble (BI) fraction. The peaks were found to appear when the ratio exceeded about 40 wt%. However, for Miike coal/tetralin slurry, no peak was detected despite of its ratio [QS-BI] / [BI] being 73wt% while the peak did appear when tetralin was replaced by indan, suggesting the viscosity change to depend not only on the ratio but also on the solubility of QS-BI fraction to solvent. Thus, the peak height was related to the difference between solubility parameters of QS-BI fraction and solvent. The result showed that the peak ap-pearedfor combinations of coal and solvent with the difference greater than 2 (cal/cm3) 1/2.
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