A method for producing renewable aviation fuel
AssigneeNeste Oyj
InventorsSylvia ALBERSBERGER, Eveliina MÄKELÄ, Marja TIITTA
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Abstract
The present invention relates to a method for producing renewable aviation fuel D or components thereto from renewable feedstock A comprising separate hydrodeoxygenation (20) hydroisomerization step (40), wherein the hydroisomerization is catalysed by metal impregnated hierarchical zeolite catalyst.
Claims18
A method for producing renewable aviation fuel or components thereto from a renewable feedstock, the method comprising
- a) providing the renewable feedstock,
- b) pre-treating the renewable feedstock by reducing the amount of impurities therein not to include:
- more than 10 w-ppm alkali metal and alkaline earth metal impurities, calculated as elemental alkaline and alkaline earth metals;
- more than 10 w-ppm other metals, calculated as elemental metals;
- more than 1000 w-ppm nitrogen containing impurities, calculated as elemental nitrogen;
- more than 30 w-ppm phosphorus containing impurities, calculated as elemental phosphorus;
- more than 5 w-ppm silicon containing impurities, calculated as elemental silicon, to produce a pre-treated feedstock,
- c) subjecting the pre-treated feedstock to hydrodeoxygenation reaction to produce a hydrodeoxygenated stream, wherein the hydrodeoxygenation reaction comprises one or more of:
- a. a temperature in the range from 250° C. to 400° C.,
- b. a pressure in the range from 10 bar to 200 bar,
- c. a WHSV in the range from 0.5 h′1 to 3 h′1,
- d. a H2 flow from 350 to 1500 N-L H2/L feed, and
- e. a hydrodeoxygenation catalyst selected from Pd, Pt, Ni, Co, Mo, Ru, Rh, and W or any combination thereof, on a support to produce a hydrodeoxygenated stream,
- d) subjecting the hydrodeoxygenated stream to a gas-liquid separation to produce a gaseous stream and a hydrodeoxygenated liquid stream, e) subjecting the hydrodeoxygenated liquid stream to hydroisomerization reaction conditions, in the presence of a metal impregnated hierarchical ZSM-23 catalyst, wherein the metal is selected from platinum, palladium, nickel and iridium, and any combinations thereof, at a temperature from 250° C. to 340° C., and in the presence of added hydrogen, to produce a hydroisomerized stream,
- f) optionally subjecting the hydroisomerized stream to stabilization, to produce a stabilized hydroisomerized stream, and
- g) separating the renewable aviation fuel or components thereto from the hydroisomerized stream, or from the stabilized hydroisomerized stream wherein the renewable aviation fuel or components thereto comprises C5-C9 hydrocarbons suitable for aviation gasoline or components thereto, and C10-C18 hydrocarbons, preferably C10-C16 hydrocarbons suitable for jet fuel or components thereto.
Use of a metal impregnated hierarchical ZSM-23 catalyst, wherein the metal is selected from platinum, palladium, nickel and iridium, and any combinations thereof for producing renewable aviation fuel or components thereto from a renewable paraffinic feed by hydroisomerization at a temperature from 250° C. to 340° C., and in the presence of added hydrogen flow.
Dependencies are inferred from the claim text.