Hydrocracking process and process for producing hyrocarbon oil

摘要

Disclosed is a method for hydrocracking a wax fraction, the method comprising: a wax fraction hydrocracking step in which a wax fraction which was contained in liquid hydrocarbons synthesized by a Fischer-Tropsch synthesis reaction is hydrocracked to obtain a hydrocracking product; a fractionation step in which the hydrocracking product is supplied to a rectifier having a bottoms cut temperature set at a constant value, and at least an intermediate fraction and a bottoms are obtained from the rectifier; a recycling step in which the whole of the bottoms is resupplied to the wax fraction hydrocracking step; and a hydrocracking control step in which the wax fraction hydrocracking step is controlled using the flow rate of the bottoms as an index.