Method for producing renewable aviation fuel

A method for producing renewable aviation fuel or components thereto, the method comprising the following steps:

• 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 wherein the pre-treating is selected from treating with mineral acids, degumming, treating with hydrogen, liquefying, heat treating, deodorizing, and bleaching;
• to produce a pre-treated feedstock,
• c) subjecting the pre-treated feedstock to hydrodeoxygenation reaction conditions to produce a hydrodeoxygenated stream, wherein the hydrodeoxygenation reaction conditions comprise 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 0.25 h−1 to 3 h−1,
• d. a H2 flow of 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 hydrodeoxygenated stream,
• d) subjecting the hydrodeoxygenated stream to a gas-liquid separation thereby producing a gaseous stream and a hydrodeoxygenated liquid stream,
• e) subjecting the hydrodeoxygenated liquid stream to hydroisomerization reaction in a presence of a hydroisomerisation catalyst, comprising a noble metal, a 12-member ring zeolite with pore size below 0.7 nm and acidity from 180 μmol/g to 500 μmol/g measured with NH3-TPD method, on a support, and hydrogen in a pressure in the range from 30 bar to 40 bar, at a temperature in a range from 270° C. to 310° C. to produce a hydroisomerized stream,
• f) optionally subjecting the hydroisomerized stream to stabilization, to produce a stabilized hydroisomerized stream, and
• g) separating from the hydroisomerized stream, or the stabilized hydroisomerized stream, the renewable aviation fuel, or components thereto, wherein the renewable aviation fuel or components thereto comprises renewable C5-C9 hydrocarbons suitable for aviation gasoline or components thereto, and renewable C10-C16 hydrocarbons suitable for jet fuel or components thereto.