Hydrocracking types

Hydrocracking Type of catalytic cracking carried out under high pressure and in a hydrogen atmosphere. 

Catalyst (sulfided) Hydrotreating plus ammonia tolerant hydrocracking types. 

Hydrocracking makes very good quality diesel fuels concerning the cetane number, cold behavior, stability, and sulfur content. However this type of stock is only available in limited quantities since the process is still not widely used owing essentially to its high cost. 

Naphtha is also obtained from other refinery processing units such as catalytic cracking, hydrocracking, and coking units. The composition of naphtha, which varies appreciably, depends mainly on the cmde type and whether it is obtained from atmospheric distillation or other processing units. 

Naphthas obtained from cracking units generally contain variable amounts of olefins, higher ratios of aromatics, and branched paraffins. Due to presence of unsaturated compounds, they are less stable than straight-mn naphthas. On the other hand, the absence of olefins increases the stability of naphthas produced by hydrocracking units. In refining operations, however, it is customary to blend one type of naphtha with another to obtain a required product or feedstock. 

Catalytic conversion processes include naphtha catalytic reforming, catalytic cracking, hydrocracking, hydrodealkylation, isomerization, alkylation, and polymerization. In these processes, one or more catalyst is used. A common factor among these processes is that most of the reactions are initiated hy an acid-type catalyst that promotes carhonium ion formation. 

This work is a contribution to the understanding of the effect of spillover hydrogen in a type of catalyst of considerable industrial importance, namely that composed of transition metal sulfides and amorphous acidic solids. This is typically the case of sulfided CoMo supported on silica-alumina used for mild hydrocracking. 

V. Hydrocracker charge exchanger liquid with a small amount of hydrogen C-0.5Mo with Type 410S rolled bond clad. Extensive blistering and Assuring under clad. 

Figure 13.36 Dimethylbutane n-hexane selectivity ratios from hydrocracking of n-hexadecane over various framework types [75].

Figure 16.7 Influence of support type on product distribution in hydrocracking hydrotreated light Arabian gasoil feed hydrocracked over amorphous and high zeolite catalysts differential yields measured in 50°F (10°C) increments.

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