The concept of catalytic cracking unit

Macromolecular hydrocarbons crack and condense under the action of heat. Using synthetic aluminum silicate catalyst: one is amorphous aluminum silicate type, and the other is zeolite type. Usually fixed bed catalytic cracking is used with low activity.

It is one of the main methods of secondary processing of petroleum. Under the action of high temperature and catalyst, the heavy oil is cracked and converted into cracked gas, gasoline and diesel. The main reactions are decomposition, isomerization, hydrogen transfer, aromatization, condensation, coke and so on. Compared with thermal cracking, it has high yield of light oil, high octane number of gasoline, better diesel stability, and by-produces liquefied gas rich in olefins. In recent years, the molecular sieve cracking catalyst uses a binder such as silica sol or aluminum sol to bond the molecular sieve and kaolin together to make a new generation of high-density and high-strength semi-synthetic molecular sieve catalysts. , and ultra-stable hydrogen-y molecular sieves. The reaction is instead carried out in a tubular reactor called riser catalytic cracking.