Process for producing high quality pyrolysis oil from biomass

a technology of biomass and pyrolysis oil, which is applied in the field of conversion of biomass, can solve the problems of large consumption of hydrogen, large cost, and general low quality, and achieve the effects of improving the quality of pyrolysis oil, reducing acidity, and high quality

Inactive Publication Date: 2012-05-03
PHILLIPS 66 CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]Generally speaking, this invention discloses a process for producing high quality pyrolysis oil from biomass by utilizing a torrefaction pretreatment step for biomass pyrolysis process wherein the pretreatment step improves the quality of the pyrolysis oil by reducing acidity.

Problems solved by technology

However, pyrolysis oil obtained from biomass fast pyrolysis process is chemical complex compounds comprising generally a mixture of water, light volatiles, and non-volatiles.
They are in general of relatively low quality.
Since pyrolysis liquids typically contain between 30 to 50 wt % of oxygen, complete removal of oxygen requires a substantial consumption of hydrogen which represents a major and prohibitive cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032]The comparison study of the process of torrefaction prior to pyrolysis has been performed in a micropyrolysis unit. The reactions were carried out at torrefaction temperatures ranging from 179° C. to 321° C. and pyrolysis temperatures ranging from 379° C. to 521° C. with no catalyst loading. In addition, a wide variety of biomass was tested including red oak, switchgrass, miscanthus, and corn stover pellets. Comparative pyrolysis tests were run without the torrefaction pretreatment at the same pyrolysis temperatures.

Results:

[0033]The experimental results indicating the reduction of acetic acid in the pyrolysis product due to torrefaction are shown as follows:

TABLE IAverage Acetic Acid Yield.Torrefaction-PyrolysisPyrolysisReduction3Yield1,Yield1,Conc.2,Yield1,Conc.2,Biomasswt-%Conc.2, %wt-%%wt-%%Oak8.765.386.294.4028.218.1Switchgrass4.644.793.073.9634.017.3Miscanthus3.756.252.354.4137.229.4Corn Stover1.895.410.743.2960.739.31Mass of acetic acid over mass of biomass2Acetic acid ...

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Abstract

This invention relates to a process to utilize a torrefaction pretreatment step for biomass pyrolysis process. This pretreatment improves the quality of the pyrolysis oil by reducing acidity. The inventive process shows that as a pretreatment to pyrolysis, resulting pyrolysis oil obtained from torrefied biomass has approximately 25% lower acetic acid than that from untorrefied biomass pyrolysis oil.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]None.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]None.FIELD OF THE INVENTION[0003]The present invention relates generally to the conversion of biomass to fuel range hydrocarbons.BACKGROUND OF THE INVENTION[0004]Due to governmental legislation as mandated in the Renewable Fuels Standards (RFS), the use of renewable energy sources is becoming increasingly necessary to reduce emissions of carbon based fuels and provide alternatives to petroleum based energy and feedstock. One of the alternatives being explored is the use of biomass. Biomass is any carbon containing material derived from living or formerly living organisms, such as wood, wood waste, crops, crop waste, waste, and animal waste.[0005]Pyrolysis is the chemical decomposition of organic materials by heating in the absence of oxygen or other reagents. Pyrolysis can be used to convert biomass (such as lignocellulosic biomass) into pyrolysis oil or so-called b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/04
CPCC10B53/02C10B57/02C10B57/08C10C5/00C10G2300/203C10L1/02C10L9/083Y02E50/14Y02E50/15C10G2300/1014C10G2300/1018Y02P20/145Y02P30/20Y02E50/10C07C29/04
Inventor DAUGAARD, DAREN EINARGONG, KENINGPLATON, ALEXANDRUJONES, SAMUEL T.
Owner PHILLIPS 66 CO
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