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Process for producing a refinery stream-compatible bio-oil from a lignocellulosic feedstock

a technology of lignocellulosic feedstock and bio-oil, which is applied in the field of compositions and methods for preparing bio-oil, can solve the problems of unnecessary addition of solvents, and achieve the effect of reducing oxygen content and reducing molecular weigh

Inactive Publication Date: 2013-08-22
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a process for producing a bio-oil that can be used in a refinery process. The process involves combining a coarse bio-oil with a previously treated bio-oil to remove oxygen and water. This results in a high oxygen content bio-oil that can be used in the refinery process. The process also produces a low oxygen content hybrid bio-oil intermediate that can be combined with the high oxygen content bio-oil or used in the refinery process. The system for producing the bio-oil includes a mixing unit, a hydrotreater, and a separator. The whole process helps to efficiently produce a low oxygen content bio-oil that can be used in a refinery process.

Problems solved by technology

Addition of a solvent may be unnecessary.

Method used

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  • Process for producing a refinery stream-compatible bio-oil from a lignocellulosic feedstock
  • Process for producing a refinery stream-compatible bio-oil from a lignocellulosic feedstock

Examples

Experimental program
Comparison scheme
Effect test

example 1

Pyrolysis Oil

[0071]A pyrolysis oil was produced from pine sawdust by a fast pyrolysis method. Chemical analysis of the pyrolysis oil showed 21% water content, and elemental analyses of 48.72% carbon, 5.97% hydrogen, <0.05% nitrogen, and 44.64% oxygen (by difference) on a moisture and ash free basis (MAF). The total acid number (TAN) of the Pyrolysis Oil was 331 mg KOH / g.

[0072]This resulting Py-Oil was immiscible with n-dodecane. The low solubility of the Py-Oil in an aromatic solvent was demonstrated using toluene as a solvent. The Py-Oil was mixed with five-to-ten times the volume of toluene. The mixture was heated to boiling and the water removed by azeotropic distillation (Dean Stark method). The resulting Py-Oil / toluene mixture was allowed to cool and two phases resulted: a thin, light colored toluene rich phase and a thick, viscous Py-Oil phase immiscible in toluene. The toluene-insoluble Py-Oil accounted for 38% of the original Py-Oil.

[0073]The elemental composition of the tol...

example 2

Lignin Bio-Oil

[0074]A lignin bio-oil was produced by hydrotreating a purified pine Kraft lignin with hydrogen at 2000 psig and 420° C. and a suspended iron based catalyst. The chemical analysis of the resultant lignin oil showed <0.34% water content, and an elemental analyses of 83.47% carbon, 9.23% hydrogen, 1.19% nitrogen, 0.40% sulfur, and 5.71% oxygen (by difference). The TAN of lignin bio-oil was 7 mg KOH / g. The number average molecular weight of the lignin bio-oil was 229 g / mol.

[0075]The solubility of the lignin bio-oil in toluene was determined. The bio-oil was mixed with nine times the volume of toluene. The mixture was heated to reflux, and then allowed to cool to room temperature. A single organic phase resulted, with the lignin bio-oil being miscible with the toluene. The lignin bio-oil was miscible with the toluene due to its low oxygen content, molecular weight, and TAN value, as compared to the toluene-insoluble Py-Oil in Example 1.

example 3

Mild Hydrotreating of Py-Oil+Lignin Oil

[0076]A Py-Oil, as described in Example 1, was blended in line with a lignin bio-oil, described in Example 2, to yield a 1:3 mixture and directly fed into a hydrotreating, down flow reactor containing a sulfided NiO / MoO3 supported catalyst (ICR181). The process pressure was 800 psig of hydrogen. A temperature gradient was applied across the catalyst bed, with the inlet temperature at 140° C., and an outlet temperature of 245° C. The product bio-oil was homogeneous and the water phase could be separated. Chemical analysis of the bio-oil product was 80.93% carbon, 9.90% hydrogen, 1.11% nitrogen, and 8.07% oxygen (by difference). The TAN of the product bio-oil was 17 mg KOH / g. Simple dilution of the Py-Oil by the lignin oil produced a TAN value of 88 mg KOH / g.

[0077]The product bio-oil was mixed with about ten times the volume of toluene. The mixture was heated to boiling and residual water entrained in the oil was removed by azeotropic distillatio...

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Abstract

In one aspect, a method for rendering biomass-derived pyrolysis oil miscible with refinery hydrocarbons comprises mixing a high oxygen content bio-oil having an oxygen content of at least about 10 wt. % with a low oxygen content bio-oil having an oxygen content of less than about 8 wt. % to produce a blended oil. The blended oil may be hydrotreated to produce a deoxygenated hydrotreated mixture from which water is removed using a separator, resulting in a low oxygen content hybrid bio-oil intermediate miscible in refinery process streams. A portion of the low oxygen content hybrid bio-oil intermediate may be recycled with the high oxygen content bio-oil or removed for use in a refinery process stream for further hydroprocessing.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to U.S. Application Ser. No. 61 / 542,083, filed Sep. 30, 2011, and which is included by reference in its entirety herein.FIELD[0002]The invention relates generally to compositions and methods for preparing biofuels, including lignocellulose-derived bio-oils compatible with refinery process streams.BACKGROUND[0003]A bio-oil produced from a lignocellulosic feedstock, typically has a high oxygen content, in the range of 10-25% O, or higher. In order for a bio-oil to be processed with a conventional refinery stream, the bio-oil needs to be miscible, or soluble, with the refinery stream. Incompatible liquids frequently will have flow or phase separation problems in flow lines, vessels or reactors.[0004]Biomass liquefaction processes, such as wood pyrolysis or wood liquefaction with a donor solvent, are coarse transformations with minimal control on the chemical makeup of the product bio-o...

Claims

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Application Information

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IPC IPC(8): C10L1/02
CPCC10B53/02C10G3/40C10G3/50C10G2300/1011C10L1/02C10G2300/202C10G2300/203Y02E50/14C10C5/00Y02P20/145Y02P30/20Y02E50/10
Inventor NAAE, DOUGLAS G.HICKS, JASON C.MAYER, JEROME F.TREVINO, HORACIOVILLEGAS, JOSE I.
Owner CHEVROU USA INC
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