Method of producing synthetic fuel

Abstract

An object of the invention is to provide a method of producing synthetic fuel from Fischer-Tropsch synthetic crude oil obtained by a Fischer-Tropsch synthesis method, the method comprising the steps of: (a) fractionating, in a fractionator, Fischer-Tropsch synthetic crude oil obtained by a Fischer-Tropsch synthesis method into at least two fractions of a middle fraction containing a component having a boiling range corresponding to diesel fuel oil, and a wax fraction containing a wax component heavier than the middle fraction; (b) separating and removing a magnetic particle contained in the wax fraction obtained in the step (a) at 100° C. to 450° C. by using a high gradient magnetic separator; and (c) hydrocracking the wax fraction obtained in the step (b) from which the magnetic particle is separated and removed.

1 . A method of producing synthetic fuel from Fischer-Tropsch synthetic crude oil obtained by a Fischer-Tropsch synthesis method, the method comprising the steps of:
 (a) fractionating, in a fractionator, Fischer-Tropsch synthetic crude oil obtained by a Fischer-Tropsch synthesis method into at least two fractions of a middle fraction containing a component having a boiling range corresponding to diesel fuel oil, and a wax fraction containing a wax component heavier than the middle fraction;   (b) separating and removing a magnetic particle contained in the wax fraction obtained in the step (a) at 100° C. to 450° C. by using a high gradient magnetic separator; and   (c) hydrocracking the wax fraction obtained in the step (b) from which the magnetic particle is separated and removed.   
     
     
         2 . The method of producing synthetic fuel according to  claim 1 , wherein, in the step (b), a ferromagnetic filling material is disposed in a space where a magnetic field is generated inside the high gradient magnetic separator, the wax fraction obtained in the step (a) is introduced into the magnetic field space in the state where the magnetic field is generated to capture the magnetic particle to the ferromagnetic filling material, and then washing liquid is introduced into the space where the ferromagnetic filling material is disposed while eliminating the magnetic field to discharge the magnetic particle to the outside of the high gradient magnetic separator. 
     
     
         3 . The method of producing synthetic fuel according to  claim 1  or  2 , wherein, in the step (b) of separating and removing the magnetic particle using the high gradient magnetic separator is carried out in conditions where the magnetic field intensity is 1,500 Gauss or more and the liquid residence time is three seconds or more.