Single stage renewable jet production
Systems and methods are provided for production of renewable jet fuel and/or jet fuel blending component fractions using a single stage reaction system. Although only a single separation stage is used, the systems and methods can reduce or minimize the volume of feedstock that is exposed to hydrocracking conditions while still producing a jet boiling range fraction having beneficial cold flow properties.
1 . A method for producing a renewable jet boiling range fraction, comprising: contacting a bio-derived feedstock and a hydrocracked, dewaxed co-feed with a hydrotreatment catalyst under effective hydrotreatment conditions to produce a deoxygenated effluent comprising a deoxygenated liquid fraction; separating the deoxygenated liquid fraction to form at least i) a jet boiling range fraction having a T90 distillation point of 230° C. or lower and a freeze point of −40° C. or lower and ii) a second fraction having a final boiling point of 300° C. or higher; contacting at least a portion of the second fraction with a hydrocracking catalyst under hydrocracking conditions to produce a hydrocracked effluent; and cascading at least a portion of the hydrocracked effluent into a reactor containing a dewaxing catalyst under dewaxing conditions to produce an effluent comprising a portion of the hydrocracked, dewaxed co-feed.
2 . The method of claim 1 , wherein the jet boiling range fraction comprises a flash point of 38° C. or higher.
3 . The method of claim 1 , wherein the jet boiling range fraction comprises 1.0 wppm or less of oxygen.
4 . The method of claim 1 , wherein a yield of the jet boiling range fraction is 25 wt % to 45 wt % relative to a weight of the bio-derived feedstock.
5 . The method of claim 1 , wherein the hydrocracking catalyst comprises a zeotype framework structure having a largest pore channel comprising a 12-member ring and wherein the dewaxing catalyst comprises a zeotype framework structure having a largest pore channel comprising a 10-member ring.
6 . The method of claim 1 , wherein the jet boiling range fraction comprises 10 wt % or more of n-paraffins, relative to a weight of the jet boiling range fraction.
7 . The method of claim 1 , the method further comprising: separating at least a portion of the deoxygenated effluent to form a fraction comprising hydrogen and the deoxygenated liquid fraction; and separating at least a portion of the fraction comprising hydrogen to form a recycle fraction containing hydrogen, wherein contacting the bio-derived feedstock and the hydrocracked, dewaxed co-feed with a hydrotreatment catalyst under effective hydrotreatment conditions contacting the bio-derived feedstock and the hydrocracked, dewaxed co-feed in the presence of at least a portion of the recycle fraction.
8 . A method for producing a renewable jet boiling range fraction, comprising: contacting a bio-derived feedstock and a hydrocracked, dewaxed co-feed with a hydrotreatment catalyst under effective hydrotreatment conditions to produce a deoxygenated effluent comprising a deoxygenated liquid fraction; separating, in a separation stage, the deoxygenated liquid fraction to form at least i) a jet boiling range fraction having a T90 distillation point of 230° C. or lower and a freeze point of −40° C. or lower and ii) a second fraction having a final boiling point of 300° C. or higher; contacting at least a portion of the second fraction with a hydrocracking catalyst under hydrocracking conditions to produce a hydrocracked effluent; and cascading at least a portion of the hydrocracked effluent into a reactor containing a dewaxing catalyst under dewaxing conditions to produce an effluent comprising a portion of the hydrocracked, dewaxed co-feed, wherein the separation stage is the is the only separation stage used to produce the renewable jet boiling range fuel from the bio-derived feedstock.
9 . The method of claim 8 , wherein the jet boiling range fraction comprises a flash point of 38° C. or higher.
10 . The method of claim 8 , wherein the jet boiling range fraction comprises 1.0 wppm or less of oxygen.
11 . The method of claim 8 , wherein a yield of the jet boiling range fraction is 25 wt % to 45 wt % relative to a weight of the bio-derived feedstock.
12 . The method of claim 8 , wherein the hydrocracking catalyst comprises a zeotype framework structure having a largest pore channel comprising a 12-member ring and wherein the dewaxing catalyst comprises a zeotype framework structure having a largest pore channel comprising a 10-member ring.
13 . The method of claim 8 , wherein the jet boiling range fraction comprises 10 wt % or more of n-paraffins, relative to a weight of the jet boiling range fraction.
14 . The method of claim 8 , wherein the dewaxing catalyst comprises a binder having a binder surface area of 100 m 2 /g or less, or wherein the dewaxing catalyst comprises a non-noble hydrogenation metal, or a combination thereof.
15 . A method for producing a renewable jet boiling range fraction, comprising: contacting a bio-derived feedstock and a hydrocracked, dewaxed co-feed with a hydrotreatment catalyst under effective hydrotreatment conditions to produce a deoxygenated effluent comprising a deoxygenated liquid fraction; separating the deoxygenated liquid fraction to form at least i) a jet boiling range fraction having a T90 distillation point of 230° C. or lower and a freeze point of −40° C. or lower and ii) a second fraction having a final boiling point of 300° C. or higher; contacting at least a portion of the second fraction with a hydrocracking catalyst under hydrocracking conditions to produce a hydrocracked effluent; and cascading at least a portion of the hydrocracked effluent into a reactor containing a dewaxing catalyst under dewaxing conditions to produce an effluent comprising a portion of the hydrocracked, dewaxed co-feed, wherein the hydrocracking catalyst comprises a noble hydrogenation metal.
16 . The method of claim 15 , wherein the deoxygenated effluent comprises 0.5 wt % or more of H 2 O.
17 . The method of claim 15 , wherein a yield of the jet boiling range fraction is 35 wt % or more relative to a weight of the bio-derived feedstock.
18 . The method of claim 15 , wherein the jet boiling range fraction comprises 5.0 wt % or more of n-paraffins, relative to a weight of the jet boiling range fraction.
19 . The method of claim 15 , the method further comprising: separating at least a portion of the deoxygenated effluent to form a fraction comprising hydrogen and the deoxygenated liquid fraction; and separating at least a portion of the fraction comprising hydrogen to form a recycle fraction containing hydrogen, wherein contacting the bio-derived feedstock and the hydrocracked, dewaxed co-feed with a hydrotreatment catalyst under effective hydrotreatment conditions contacting the bio-derived feedstock and the hydrocracked, dewaxed co-feed in the presence of at least a portion of the recycle fraction.