Method for Producing Hydrocarbon Fuel Oil
To efficiently obtain a liquid fuel containing no sulfur and having good cold flow properties by hydrotreating heavy wax generated by the Fischer-Tropsch (FT) synthesis to perform cracking with the gasification rate restrained and also increase an isomerization reaction which occurs at the same time. A method for producing a hydrocarbon fuel oil, in which heavy wax generated by the FT synthesis is hydrotreated with a catalyst of the platinum group using zeolite or silica-alumina as a support under specific reaction conditions corresponding to the kind of the support, thereby performing cracking and an isomerization reaction.
1 . A method for producing a hydrocarbon fuel oil, wherein wax generated by the Fischer-Tropsch synthesis and containing 50% or more by mass of normal paraffin having 7 to 100 carbon number is cracked and isomerized at a gasification rate of less than 10% by mass to an isoparaffin ratio in a fraction with 9 to 21 carbon number of 70% or more by mass, using a catalyst in which at least one kind of platinum group metal is contained on a support comprising zeolite as a main component in an amount of 0.01 to 10% by mass, in terms of metal, on a catalyst basis, at a hydrogen partial pressure of 2 to 20 MPa, at a temperature of 200 to 320° C., at a liquid hourly space velocity of 0.1 to 2 h −1 and at a hydrogen/oil ratio of 100 to 2000 L/L.
2 . A method for producing a hydrocarbon fuel oil, wherein wax generated by the Fischer-Tropsch synthesis and containing 50% or more by mass of normal paraffin having 7 to 100 carbon number is cracked and isomerized at a gasification rate of less than 10% by mass to an isoparaffin ratio in a fraction with 9 to 21 carbon number of 70% or more by mass, using a catalyst in which at least one kind of platinum group metal is contained on a support comprising silica-alumina as a main component in an amount of 0.01 to 10% by mass in terms of metal on a catalyst basis, at a hydrogen partial pressure of 2 to 20 MPa, at a temperature of 350 to 400° C., at a liquid hourly space velocity of 0.1 to 2 h −1 and at a hydrogen/oil ratio of 100 to 2000 L/L.