Patent ID: 9376352
Filing Date: 2016-06-28
CPC Classification: C07C,C10G

Claim Text:
1. A start-up method of a bubble column slurry bed reactor for producing hydrocarbons by the Fischer-Tropsch synthesis reaction, the method comprising: a first step of filling a reactor with a slurry, in which Fischer-Tropsch synthesis reaction catalyst particles are suspended in a slurry preparation oil, which is a hydrocarbon oil in which a sulfur content and an aromatic content are respectively 1 mass ppm or lower, the 5% distillation point is 120 to 270° C., and the 95% distillation point is 330 to 650° C., wherein the filling is performed such that a volume of a heavy oil component comprising components with a boiling point of 300° C. or more in the hydrocarbon oil within the slurry is 50% or more with respect to a volume of a void space in the reactor below a lowest end of a lowest part heat removal line installed in the reactor, and such that a height of a liquid surface of the slurry in the reactor is lower than a height at which airborne droplets of liquid in the reactor begin to be carried by gas flowing out from an outlet of the reactor upper part; and a second step of, in a state where synthesis gas that is primarily hydrogen and carbon monoxide is introduced into the slurry filled reactor, increasing a reaction temperature of the reactor, and starting the Fischer-Tropsch synthesis reaction; wherein the slurry preparation oil of the first step further comprises a light oil component comprising components with a boiling point of less than 300° C., such that when a carbon monoxide conversion rate of the Fischer-Tropsch synthesis reaction has reached 20 volume % in the second step, the light oil component is present as a liquid in the reactor at 1 volume % or more with respect to the hydrocarbon oil.