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 for producing a lower olefin and BTX from stock oils selected from at least two varieties, wherein the method is characterized by comprising: a first catalytic cracking step for bringing, among the stock oils, a stock oil A into contact with a catalytic cracking catalyst; a second catalytic cracking step for bringing, among the stock oils, a stock oil B having a lower aromatic component content than the stock oil A into contact with a catalytic cracking catalyst; and a separation and collection step for collecting a lower olefin and BTX from products obtained by the first and second catalytic cracking steps; a time A over which the stock oil A and the catalytic cracking catalyst are in contact in the first catalytic cracking step being longer than a time B over which the stock oil B and the catalytic cracking catalyst are in contact in the second catalytic cracking step.