Kentucky 9/14 coal, pressure

Data on Illinois No. 6 and Kentucky No. 9 coals were used by Wen and Han (Prepi Pap.—Am. Chem. Soc., Div. Fuel Chem. 20(1) 216-233, 1975) to obtain a rate equation for coal dissolution under hydrogen pressure. These data included a temperature range of 648 to 773 K (705 to 930°F) and pressures up to 13.8 MPa (2000 psia). An empirical rate expression was proposed as... 

West-Kentucky, and Itmann coals of three different ranks were sufficiently liquefied with hydropyrene under atmospheric pressure at 370°C regardless of their fusibility. The analyses of hydropyrene and the coal before and after the liquefaction clearly indicate the hydrogen transfer from the solvent to the coal substance. Lower rank coals look to show rather higher reactivity in such liquefaction, probably because their constituent molecule may have smaller condensed ring. 

The coal liquid is obtained by reacting Kentucky 9/14 coal-LRO slurry for 60 minutes at 410°C in an autoclave reactor under 2000 psig (13.9 MPa) hydrogen pressure. The product from the autoclave is collected and filtered using Watman 51 filter paper to remove the mineral matter and undissolved coal. The liquid product is saved and used for further hydrotreating studies. The analysis of the filtered product from the coal dissolution step is given in Table I. 

Effect of Hydrogen Partial Pressure on Hydrotreating of Kentucky 9/14 Coal Liquid... 

Three different types of material were used to study the pressure-filtration method. Those were 1) Kentucky 9/14 coal, 2) slurries from low-temperature reactions (low conversion to soluble products, high solids content), and 3) slurries from high-temperature reactions (high conversion to soluble products, low solids content). These particular types were chosen because the first represents a material that is difficult to extract the second, a material that was difficult to extract with some solvents and more easily extracted with others and the third, a material that can be extracted with most solvents. 

Guin et al. (49) studied the HDS of creosote oil and Kentucky No. 9/14 coal mixture at 683 K and 6.8 MPa and 17 MPa initial hydrogen pressures in the presence of C0M0/AI2O3 catalyst and other mineral matter. The results indicated that C0M0/AI2O3 was the best catalyst (removing almost all the sulfur) and ankerite was the worst. 

Garg et al. (58) studied the effects of haematite on HDS of Western Kentucky No. 9/14 coal at 658-693 K for 15-20 min at hydrogen partial pressures varying from 7.0 to 20,8 MPa. They found that after 15 minutes of reaction time in the presence of haematite,the same amount of sulfur was removed as is removed in 120 mins without haematite. Haematite was found to be very active during short reaction times however, it was not very effective at the large reaction times. They also concluded that the desulfurization rate was independent ot catalyst particle size but it depended upon the surface area. 

Reconciled operation data is given from the pilot imit in Des Plains, Illinois, for a Western Kentucky No. 9 (WKY 9) bituminous coal in Table 6.20. The moderate pressure of approximately 4 bar, the very high steam feeding, and the special gasifying agent (enriched air, 87.6 vol% O2) shovdd be considered looking at the data [161,165]. 

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