Long-contact-time thermal processes

Long contact time thermal processes have the intrinsic disadvantage of poor selectivity for light hydrocarbon gas formation relative to heteroatom removal (see Figure 3). 

In long contact time thermal processes, essentially no net hydrogen is introduced into the heavy liquid products and the major product (SRC) continually dehydrogenates with increasing time (4,11). These last two points are illustrated in Table I and Figure 4. 

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