introduction to biorefining
TRANSCRIPT
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Introduction to Biorefining
Daniel Hayes
DIBANET Networking Day13/12/10
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• Combustion (e.g. wood chip boilers, incineration)
• Liquid Biofuels (1st Generation)
Ethanol Biodiesel
Sugar beet RapeseedWheat SoybeanCorn SunflowerSugarcane
• First generation biofuels come from food or oil crops.
Current Biomass Uses
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Foods Are Ideal Chemically
Sucrose
Amylose
STARCH
Amylopectin
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Fats/Oils are Also Easy!
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Problems with 1st Gen Feedstocks
• High establishment, maintenance costs (esp. EU).
• Poor energy ratios.• High CO2 emissions.• Food versus fuel.• Most of crop is not utilised.• Sugarcane ethanol is the exception but
there only a portion of the crop is used.
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• Lower cost:– waste/residues– Sustainable energy crops, marginal land.
• Biomass where most of crop can be utilised.
• Such biomass tends to be lignocellulosic(cellulose, hemicellulose, lignin).
• Typical grasses/woods 45% cellulose, 25% hemicellulose, 25%
lignin
Use Different Feedstocks!
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Biorefineries
• Analogous to oil refineries.• Obtain different saleable products from
the different chemical constituents of biomass.
• A range of potential products are possible ranging from low volume and high value (specialty chemicals) to high volume and lower value (biofuels)
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Cellulose
8
http://www.generalbiomass.com/cellethanol1.htm
Hemicellulose
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HEMICELLULOSE
n
O
O
OHO
O
O
OOHO
O
O
OH
O
OHO HOOH
O
OH
OHMeO
OHO
OOH
O
OH
OH
OH
Hemicellulose
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http://en.wikipedia.org/wiki/File:Lignin_structure.svg
Lignin
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Challenges in Processing Lignocellulosics
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Lignocellulosic BiorefineryTechnologies
• Polysaccharide Hydrolysis to monosaccharides:– Dilute acid hydrolysis– Concentrated acid hydrolysis– Enzymatic hydrolysis– Steam Auto-hydrolysis� conversion to saleable products e.g. ethanol,
furfural • Thermochemical - Gasification and pyrolysis.
Produce liquid product, biochar and combustible/reformable gas.
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Biomass
Size Reduction
Pre-treatment
Steam Explosion
Liquid Hot Water
Dilute Acid
Alkaline
Other Solvents
Size Reduction
Washing
Drying
Torrefaction
PyrolysisBio-oil
Biochar
Diesel
Gasification
Acid Hydrolysis
Dilute
Concentrated
Hydrolysis Processes PRODUCTS
Sugars
Enzymatic Hydrolysis
SHF
Ethanol
SSF SSCF CBP
Butanol
LevulinicAcid
Lignin Residue
DIBANET
UpgradingHydrogen
Electricity
Fermentation
Pre-treatment
Syngas
ThermochemicalProcesses
Soil Enhancement
Biorefining Pathways
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Hydrolysis Techniques• Hydrolysis can occur with concentrated or dilute acids,
enzymes, or thermochemical procedures.• Acid hydrolysis:
– Catalyst to break glycosidic bonds at low/high temperatures.– Possible for many feedstocks.– Non-selective action, can produce undesirable byproducts.
• Enzymatic hydrolysis:– Theoretically highly selective, high monomer yields.– Current costs are high, enzyme loss, pretreatment.– Treatment of waste materials may be more difficult.– Massive research underway � holy grail is a single organism that
can hydrolyse biomass and produce the final product (e.g. ethanol) in a single reactor – CBP.
– Current techniques focus on multiple reactors, SHF, and on a variety of microorganisms/enzymes for hydrolysis/fermentation.
• Thermal hydrolysis (e.g. steam auto hydrolysis):– Only suitable for hemicelluloses.
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Ethanol or Something Else?
• Many hydrolysis technologies focus on ethanol production.
• Yields from glucose not optimised.• May not allow efficient utilisation of C5
sugars.• Maximum theoretical yields of ethanol is
approximately 50% of mass of carbohydrate.• Fermentation may result in saleable mass
halving.• The production of value-added products
without biotic activity (e.g. DIBANET) is another option.
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Chemical conversions
BIO-OIL
GAS
FEEDSTOCK PRE-TREATMENT
SOIL AMENDMENT
GasificationPyrolysis
THERMAL CONVERSION
Catalytical gasification
BIO SYNGAS-
Chemical industry
FEEDSTOCK
BIOCHAR
ANALYSIS ANALYSIS
Thermochemical Conversion of Biomass
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Pyrolysis
PYROLYSIS400 - 600ºC
no O2
CONDENSATION
CATALYTIC CONVERSIONTO HYDROGEN (Optional)
Vapors
GasesH , CO, CH , C H2 4 2 4
Biochar Heat
Biomass LiquidsPOWERGENERATION
CHEMICALSEPARATION
or
COMBUSTION
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Gasification
GASIFICATION>750ºC1/3 O2
Gases
, H , CO, , O, CO
2
2
N2
CH H4 2
Char, Ash & Tar
Air/Oxygen/Steam
Biomass POWER GENERATIONorCATALYTIC CONVERSION
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Yields in Thermochemical Processes
Table: Typical product yields (dry wood basis) obtained by different modes of pyrolysis of wood
Mode Conditions Liquid Gas Char
Fast pyrolysis moderate temperature, around 500°C, short hot vapour residence time ~1 s
75 % 13 % 12 %
Intermediate pyrolysis
moderate temperature, around 500°C, moderate hot vapour residence time ~10-20 s
50 % 30 % 20 %
Slow pyrolysis (carbonisation)
low temperature, around 400°C, very long solids residence time
30 % 35 % 35 %
Gasification high temperature, around 800°C, long vapour residence time 5 % 85 % 10 %
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Bio-Oil – Needs Upgrading
• Improve some of Unfavourable Properties:– High water content– High oxygen content– Low heating value– Instability– High viscosity– Low pH– High particle content– Inhomogenity
• Produce a diesel miscible bio-oil
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Biochar Potential
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22
Locking up Carbon with Biochar
Source: Lehmann et al., 2006
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Summary
• There are numerous technological options for the processing of lignocellulosic materials.
• Which technology is used depends on the properties of the feedstock (carbohyrdatecontent, moisture content etc.) and what the desired end products are.
• The DIBANET concept involves a linking of the hydrolysis and thermochemical platforms to allow maximal utilisation of a material and afford feedstock flexibility…..