What is the difference between hydrocracking and hydroisomerization?
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While reading the literature, it states that the Dalian Institute of Chemical Physics developed a hydrogenation isomerization catalyst (the 219 catalyst) in the 1960s. What is the relationship between hydrogenation isomerization and hydrogenation cracking, and what are the differences between them? I’m an amateur, not someone involved in catalysis, so I would like to ask the experts for their advice. Thank you!
Isomerization is a process or action in which one isomer is converted into another isomer, altering the structure of the compound without changing its composition or molecular weight. It generally refers to a change in the position of atoms or groups within a organic compound molecule. It is often carried out in the presence of a catalyst. Cracking is a reaction process that splits hydrocarbon molecules into several smaller molecules. A simple cracking reaction is an endothermic reaction; if a large amount of catalytic hydrogenation reactions occur simultaneously during the cracking process (such as hydrocracking), it becomes an exothermic reaction. Simple cracking is an irreversible reaction. The primary products of the cracking reaction undergo secondary cracking as well; in addition, a small amount of the feedstock also undergoes condensation reactions during cracking. Therefore, the cracking reaction belongs to the type of parallel sequential reaction.
Thank you very much for your reply. I still don’t quite understand the difference between hydrocracking and hydroisomerization. Does hydrocracking include hydroisomerization as well?
Cracking is a process of fragmentation in which molecules become smaller, while hydrocracking involves a transformation between isomers; the molecular formula remains unchanged, and the molecular weight stays the same, with only the structural formula changing.
Cracking is a process of splitting, during which molecules become smaller