The difference between catalytic cracking unit and catalytic cracking:

The difference between catalytic cracking unit and catalytic cracking To a certain extent, catalytic cracking is developed on the basis of catalytic cracking, but there are obvious differences between the two, as follows:

① The purpose is different. Catalytic cracking aims to produce light oil products such as gasoline, kerosene and diesel, while catalytic cracking aims to produce basic chemical raw materials such as ethylene, propylene, butene and butadiene.

② The raw materials are different. The raw materials of catalytic cracking are generally vacuum distillate oil, coking wax oil, atmospheric residual oil, and vacuum distillate oil mixed with vacuum residual oil; and the range of raw materials for catalytic cracking is relatively wide, which can be the raw materials of catalytic cracking, or Naphtha, diesel and C4, C5 light hydrocarbons, etc.

③ The catalysts are different. The catalysts for catalytic cracking are generally zeolite molecular sieve catalysts and aluminum silicate catalysts, while the catalysts for catalytic cracking are generally zeolite molecular sieve catalysts and metal oxide catalysts.

④ The operating conditions are different. Compared with catalytic cracking, catalytic cracking has higher reaction temperature, larger catalyst oil ratio, more steam consumption, shorter oil and gas residence time, and more serious secondary reactions.

⑤ The reaction mechanism is different. The reaction mechanism of catalytic cracking is generally considered to be the carbocation mechanism, and the reaction mechanism of catalytic cracking includes both the carbocation mechanism and the free radical mechanism.