METHOD FOR PRODUCING SINGLE-RING AROMATIC HYDROCARBONS

摘要

Provided is a method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms, the method including a cracking reforming reaction step of bringing feedstock oil into contact with a catalyst to effect a reaction, thereby obtaining a product containing monocyclic aromatic hydrocarbons; a purification/recovery step of purifying and recovering monocyclic aromatic hydrocarbons separated from the product produced in the cracking reforming reaction step; and (1) a hydrogenation step of hydrogenating a heavy fraction separated from the product produced in the cracking reforming reaction step; a dilution step of returning a portion of the hydrogenation product of the heavy fraction obtained in the hydrogenation step, as a diluent oil to the hydrogenation step; and a recycling step of returning the hydrogenation product of the heavy fraction obtained in the hydrogenation step to the cracking reforming reaction step; or (2) a dilution step of adding a diluent to the heavy fraction separated from the product produced in the cracking reforming reaction step; a hydrogenation step of hydrogenating the mixture; and a recycling step of returning the hydrogenation product of the mixture obtained in the hydrogenation step to the cracking reforming reaction step.