Method for producing monocyclic aromatic hydrocarbons

摘要

A method for producing monocyclic aromatic hydrocarbons includes a cracking reforming reaction step of bringing an oil feedstock into contact with a catalyst for monocyclic aromatic hydrocarbon production containing a crystalline aluminosilicate, and causing the oil feedstock to react, thereby obtaining a product containing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms, a hydrogenation reaction step of hydrogenating a product produced in the cracking reforming reaction step, a monocyclic aromatic hydrocarbon recovery step of recovering monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms separated from a hydrogenation product obtained in the hydrogenation reaction step and a recycling step of returning a heavy fraction having 9 or more carbon atoms separated from the hydrogenation product obtained in the hydrogenation reaction step to the cracking reforming reaction step.

主权项

1. A method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms from an oil feedstock having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, the method comprising:
a cracking reforming reaction step of bringing the oil feedstock into contact with a catalyst for monocyclic aromatic hydrocarbon production containing a crystalline aluminosilicate, and causing the oil feedstock to react, thereby obtaining a product containing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms, a heavy fraction having 9 or more carbon atoms including polycyclic aromatic hydrocarbons, hydrogen, methane, ethane, ethylene and LPG; a hydrogenation reaction step of hydrogenating the product produced in the cracking reforming reaction step; a monocyclic aromatic hydrocarbon recovery step of recovering monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms separated from a hydrogenation product obtained in the hydrogenation reaction step; and a recycling step of returning a heavy fraction having 9 or more carbon atoms separated from the hydrogenation product obtained in the hydrogenation reaction step to the cracking reforming reaction step,
wherein, in the hydrogenation reaction step, the product produced in the cracking reforming reaction step is subjected to hydrogenation without separating the monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms from the product, such that a concentration of the polycyclic aromatic hydrocarbons decreases and heat generation is suppressed in the hydrogenation reaction step.