Method of hydrocracking and process for producing hydrocarbon oil

摘要

Disclosed is a method of hydrocracking which comprises: a wax-fraction hydrocracking step in which a wax fraction separated from a Fischer-Tropsch synthesis oil is hydrocracked to obtain a hydrocracking product; a gas-liquid separation step in which the hydrocracking product is separated with a multistage gas-liquid separator into gaseous matter, heavy-oil matter, and light-oil matter; a step for estimating the content of specific components in which the ratio of the flow rate of the heavy-oil matter to the flow rate of the light-oil matter is determined, and the content of specific hydrocarbon components in the hydrocracking product is estimated from the flow-rate ratio; and a control step in which the operation for the wax-fraction hydrocracking step is controlled on the basis of the estimated value so that the content of the specific hydrocarbon components is in a given range.