What are the differences in composition and properties of gasoline produced by atmospheric and vacuum distillation, catalytic cracking, catalytic reforming and hydrocracking? How to analyze from the process characteristics? 1, the octane number of straight-run gasoline obtained by atmospheric and vacuum distillation is only about 40 (motor method). The straight-run gasoline distilled by atmospheric and vacuum distillation faces many problems such as extremely high octane number, high distillation temperature and high acidity, which does not meet the requirements of petroleum product standards. Therefore, atmospheric and vacuum straight-run gasoline is usually used as raw material for reforming and ethylene cracking.

Since reforming is mentioned above, let's talk about catalytic reforming first. The definition of catalytic reforming is that naphtha (straight-run gasoline) is used as raw material, and in the presence of hydrogen and catalyst, at a certain temperature and pressure, hydrocarbon molecules are rearranged to convert naphtha into reformed oil rich in aromatic hydrocarbons. The octane number of semi-regenerative reformed gasoline can reach above 90 (research method), and the octane number of continuous reforming research method can reach 100. In addition, the content of olefin and sulfur in reformed gasoline is low, which are the main problems faced by China Refinery in producing clean gasoline, and reforming plays an important role in this contradiction. Note: Catalytic reforming can produce high octane gasoline and aromatics. 70% of the world's reforming produces high octane gasoline, and 30% produces aromatics.

3. FCC raw materials are extensive, including atmospheric residue and vacuum residue, as well as secondary processed coker wax oil, in addition to straight-run gasoline. The products obtained under different reaction conditions and catalysts are also different. The gas yield of FCC products accounts for 10% to 20%, the diesel oil yield accounts for 20% to 40%, and the gasoline yield accounts for 40% to 60%. The gasoline obtained by catalytic cracking has an octane number of about 80, good stability and good service performance.

4. Hydrocracking has two purposes. 1 is to refine oil, improve performance and protect the environment. 2. The downstream raw materials are treated to improve the operation performance of the downstream device. According to different raw materials, it can be divided into distillate hydrocracking and residue hydrocracking. Hydrocracking can process all kinds of heavy and inferior oils, produce all kinds of high-quality fuel oil and various chemical raw materials.

Note: In the composition table of gasoline blending components, straight-run gasoline accounts for 9%, catalytic cracking gasoline accounts for 34%, catalytic reforming gasoline accounts for 33%, hydrocracking gasoline accounts for 2%, alkylated gasoline accounts for 8%, isomerized gasoline accounts for 6%, and other percentages are MTBE, ETBE, methanol and other blending agents.

I wonder if the above answer has solved your problem.