Abstract
A simulation for well-mixed SRC-II coal liquefaction reactors was developed to analyze the observed effects of hydrogen treat rate and hydrogen mass transfer on the rate of liquefaction. The validated simulation shows that the observed enhancement in the rate of liquefaction with increase in the hydrogen treat rate results from a reduction in H/sub 2/S partial pressure in the reactor. The hydrogen partial pressure is relatively insensitive to the hydrogen treat rate, and therefore, its contribution to the change in rate of liquefaction is very small. At very low levels of mixing power in the reactor, the rate of hydrogen mass transfer can have a significant effect on the rate of liquefaction. However, even for the lower range of mixing powers used in the bench-scale bubble column rectors, the effect of hydrogen mass transfer on the rate of reaction is small. High solubility of hydrogen in coal liquids is the basic reason for the small hydrogen mass-transfer effect.
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