Renewable diesel production from catalytic pyrolysis feedstock
The present invention provides a catalytic pyrolysis process for the production of renewable diesel fuel. The present invention provides a process for preparing renewable diesel fuel, comprising preparing renewable diesel fuel by a) fractionating a mixture comprising renewable aromatics to produce a first fraction boiling at 180° C. to 350° C. at atmospheric conditions, and a fraction boiling below the boiling point of the first fraction, blending at least a portion of the first fraction with at least one distillate cut having lower aromatic content than the first fraction, and b) hydrogenating a blend of the first fraction and distillate cut having lower aromatic content to produce a hydrogenated fraction comprising a renewable diesel fuel.
1 . A process for preparing renewable diesel fuel, comprising preparing renewable diesel fuel by: a) fractionating a mixture comprising renewable aromatics to produce a first fraction boiling at 180° C. to 350° C. at atmospheric conditions, and a fraction boiling below the boiling point of the first fraction, blending at least a portion of the first fraction with at least one distillate cut having lower aromatic content than the first fraction, and b) hydrogenating a blend of the first fraction and distillate cut having lower aromatic content to produce a hydrogenated fraction comprising a renewable diesel fuel; and wherein the distillate cut is a straight run gasoil, or a mixture of straight run gasoil and light cycle oil.
2 . The process of claim 1 , comprising
a) fractionating a mixture comprising renewable aromatics to produce a first fraction boiling at or above 180° C. at atmospheric conditions, and a fraction boiling below the first fraction, blending at least a portion of the first fraction with at least one distillate cut having lower aromatic content than the first fraction, and
b) hydrogenating a blend of the first fraction and distillate cut.
3 . The process of claim 1 , wherein the mixture comprising renewable aromatics is the product of pyrolysis of biomass.
4 . A process for preparing renewable diesel fuel, comprising:
a) feeding biomass, catalyst composition, and transport fluid to a catalytic pyrolysis process fluidized bed reactor maintained at reaction conditions to manufacture a raw fluid product stream,
b) feeding the raw fluid product stream of a) to a solids separation and stripping system to produce separated solids and a fluid product stream,
c) feeding the fluid product stream of b) to a fractionation system in order to recover a first fraction boiling at or above 180° C. to 350° C.,
d) mixing the first fraction of c) with at least one distillate cut having lower aromatic content than the first fraction in order to dilute the aromatic content of a resultant mixture below 60 wt. %, wherein the at least one distillate cut has a boiling point range compatible with diesel fuel, wherein the distillate cut having lower aromatic content than the first fraction proportion in the blend of step d) is above 40 wt %,
e) hydrogenating at least a portion of a blend generated in d) with hydrogen at hydrogenation conditions to produce a hydrogenated fraction,
f) optionally recovering diesel fuel comprising naphthenes from the hydrogenated fraction of e).
5 . The process of claim 4 , comprising in c) feeding the fluid product stream of b) to a fractionation system in order to recover a first fraction boiling at or above 180° C.
6 . The process of claim 4 , wherein d) comprises mixing the first fraction of c) with at least one distillate cut having lower aromatic content than the first fraction in order to dilute the aromatic content of a resultant mixture below 50 wt. %.
7 . The process of claim 4 , wherein d) comprises mixing the first fraction of c) with at least one distillate cut having lower aromatic content than the first fraction in order to dilute the aromatic content of a resultant mixture below 40 wt. %.
8 . The process of claim 4 , wherein the biomass is wood, forestry waste, corn stover, agricultural solid waste, municipal solid waste, digestate, food waste, animal waste, carbohydrate, lignocellulosic material, xylitol, glucose, cellobiose, hemicellulose, lignin, or combinations thereof.
9 . The process of claim 4 , wherein the distillate cut is a straight run gasoil, or a mixture of straight run gasoil and light cycle oil.
10 . The process of claim 4 , wherein the raw fluid product stream of a) is a naphthalene-rich oil.
11 . The process of claim 4 , wherein hydrogenation converts compounds having aromatic rings to naphthenes.
12 . The process of claim 4 , wherein in a) pyrolysis is conducted with an operating temperature of 300° C. to 1000° C., a pressure of 0.1 to 3.0 MPa, and a solid catalyst/biomass mass ratio of 0.1 to 40.
13 . The process of claim 4 , wherein in a) pyrolysis is conducted with a catalyst that is a crystalline molecular sieve having a silica to alumina ratio greater than 12 and an internal porosity with average pore sizes less than 10 nm.
14 . The process of claim 13 , wherein the catalyst is ZSM-5, ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-50 or a mixture thereof.
15 . The process of claim 4 , wherein in c) the first fraction comprises at least 25 vol. % naphthalene and substituted naphthalenes.
16 . The process of claim 4 , wherein the hydrogenated fraction in e) comprises tetralins, decalins and naphthenes.
17 . The process of claim 4 , further comprising recycling a portion of the hydrogenated fraction from e) to pyrolysis in a).
18 . A diesel fuel containing renewable fuel, produced by a process according to claim 4 .