METHOD FOR PRODUCING LOWER OLEFIN AND C6-8 MONOCYCLIC AROMATIC HYDROCARBON AND APPARATUS FOR PRODUCING LOWER OLEFIN AND C6-8 MONOCYCLIC AROMATIC HYDROCARBON

摘要

A method of producing a lower olefin and BTX from stock oils selected from at least two or more kinds of oils, the method including: a first catalytic cracking step of bringing one stock oil A among the stock oils into contact with a catalytic cracking catalyst; a second catalytic cracking step of bringing one stock oil B, having an aromatic component content smaller than that of the stock oil A, among the stock oils into contact with the catalytic cracking catalyst; and a separation and collection step of collecting the lower olefins and BTX from a product generated in the first and second catalytic cracking steps, in which a contact time A during which the stock oil A is in contact with the catalytic cracking catalyst in the first catalytic cracking step is longer than a contact time B during which the stock oil B is in contact with the catalytic cracking catalyst in the second catalytic cracking step.