A method for producing renewable gas, renewable naphtha, and renewable jet fuel

A method for producing renewable gas, renewable naphtha, and renewable jet fuel or components thereto from a renewable feedstock, 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 alkali metals 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 0.25 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 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 comprising
• i. a temperature in the range from 270° C. to 340° C.,
• ii. a pressure in the range from 10 bar to 100 bar,
• iii. a hydroisomerization catalyst comprising a metal impregnated ZSM-23 zeolite on a support, wherein
• a. the metal is selected from noble metals and Ni and any combinations thereof, and metal content of the catalyst is from 0.1 wt-% to 5.0 wt-%,
• b. the ZSM-23 zeolite comprising one or more of the following features:
• SiO2/Al2O3 molar ratio is from 10 to 85, preferably from 15 to 85 such as from 40 to 80,
• crystallinity is from 40% to 95%, measured by X-ray diffraction (XRD) according to ASTM D5758-01 (2021),
• BET surface area is from 180 m2/g to 350 m2/g, such as from 200 m2/g to 300 m2/g, determined by nitrogen physisorption,
• acidity is from 250 μmol/g to 500 μmol/g, measured with NH3-TPD method, wherein acidity is calculated from the amount of NH3 adsorbed at 200° C. and desorbed between 100° C. and 500° C.,
• ratio of Brønsted acid sites to Lewis acid sites is from 10 to 20, measured by the pyridine FTIR, and
• crystalline zeolite particles are needle-like particles of a size below 2 μm along the needle, and
• c. the support comprising alumina, silica, or alumina-silica,
• in the presence of hydrogen flow to produce a hydroisomerized stream,
• f) optionally subjecting the hydroisomerized stream to stabilization, to obtain a stabilized hydroisomerized stream, and
• g) separating the hydroisomerized stream, or optionally the stabilized hydroisomerized stream at least to
• i) a fraction rich in C1-C4 hydrocarbons thereby producing the renewable gas,
• ii) a fraction rich in C5-C9 hydrocarbons thereby producing the renewable naphtha or components thereto, and
• iii) a fraction rich in C10-C16 hydrocarbons thereby producing the renewable jet fuel or components thereto.