What is the difference between alkylation, isomerization, and catalytic reforming? What are the differences among the raw materials?

Alkylation generally uses C4 components to produce isooctane as a component for gasoline blending; this blending component has low sulfur content and a high octane rating. By \"isomerization,\" I assume you mean the isomerization of C5 and C6 compounds, with the main goal being to convert straight-chain alkanes into isomers in order to increase their octane rating. The octane rating of the resulting product is usually between 80 and 85, and this product is also used as a component for gasoline blending. Due to its low sulfur content and absence of olefins and aromatics, it is an ideal component for gasoline blending as well. Reformated gasoline typically comes from semi-reforming or continuous reforming processes; in China, there are more continuous reforming units. This type of oil has a high octane rating, but it also contains a high level of aromatics. To meet the national gasoline standards for levels 4 and 5, it is necessary to mix it with oil from other refining processes. In short, your question is about the characteristics of gasoline blending components from different sources, right?