Pretreatment Technologies JeanLuc Wertz and Prof Michel Paquot
- Slides: 41
Pre-treatment Technologies Jean-Luc Wertz and Prof. Michel Paquot Lignofuels 2011 - 29 September 2011
PLAN 1. Introduction 2. Physical pre-treatments 3. Chemical pre-treatments (e. g. organosolv) 4. Physicochemical pre-treatments (e. g. steam explosion; AFEX) 5. Biological pre-treatments 6. Economic analysis (OPEX, CAPEX) 7. Performance summary
Average composition of lignocellulosic biomass
Cellulose: molecular structure • Glucose units linked by β 1 -4 glycosidic bonds • One reducing end and one non-reducing end • Linear straight polysaccharide
Hemicelluloses • High structural diversity • Monomers: pentoses and hexoses • Branched polysaccharides • Example: xyloglucans as shown below
Lignin • Monomers : 3 different monolignols (H, hydroxyphenyl; G, guaïacyl; S, syringyl) H G S
Lignin Cross-linked polymers of monolignols
Schematic of the role of pre-treatment Source: P. Kumar et al. , 2009
Liquid hot water (LHW) Biomass pretreatment with water at high temperature and pressure
Inbicon’s hydrothermal pre-treatment pilot plant
Weak and strong acid hydrolysis 1 Weak acid: -High-temperature (>160°C), continuous-flow process for low solids loadings -Low-temperature (<160°C) batch process for high solids loadings 2. Strong acid: Powerful agents for cellulose hydrolysis and no enzymes are needed after the concentrated acid process
Alkaline hydrolysis Well known in the pulp and paper industry as kraft pulping
Extraction of lignin from Kraft pulp mill black liquor by the Ligno. Boost process Source: Metso, Ligno. Boost
Schematic of the Mix. Alco® process (Terrabon, Inc. ) Source: Holtzapple et al. , Terrabon
Organosolv processes Solvolytic cleavage of an alpha-aryl ether linkage by nucleophilic substitution; R=H or CH 3; B=OH, OCH 3
Some important organosolv processes Process Name Solvent / Additive Asam Water + sodium carbonate + hydroxide + sulfide + methanol / Anthraquinone Organocell Water + sodium hydroxide + methanol Alcell (APR) Water+ low aliphatic alcohol Milox Water + formic acid + hydrogen peroxide (forming peroxyformic acid) Acetosolv Water + acetic acid/Hydrochloric acid Acetocell Water + acetic acid Formacell Water + acetic acid + formic acid Formosolv Water + formic acid + hydrochloric acid
Lignol’s process based on water/ethanol pre-treatment Source: Lignol
lignocellulosic materials heating Formic Ac. /Acetic Ac. /Water CIMV process: formic acid / acetic acid / H 2 O filtration black liquors pulp rinsing Formic Ac. /Acetic Ac. /Water black liquors water precipitation Water pulp washing Water centrifugation Water solubles pulp lignins washing Acidified water Source: C. Vanderghem et al. , ULg-Gx. ABT lignins
CIMV process using acetic acid/formic acid/water Source: C. Vanderghem et al. , ULg-Gx. ABT , Time: 1 h (-1), 2 h (0), 3 h(1). Temperature: 80°C (-1), 90°C (0), 107°C (1)
CIMV process using acetic acid/formic acid/water Source: C. Vanderghem et al. , ULg-Gx. ABT Temperature: 80°C (-1), 90°C (0), 107°C (1). FA/AA/W: 20/60/20 (-1) 30/50/20(0); 40/40/20 (1)
CIMV process using acetic acid/formic acid/water Source: C. Vanderghem et al. , ULg-Gx. ABT Time: 1 h (-1), 2 h (0), 3 h(1). Temperature: 80°C (-1), 90°C (0), 107°C (1)
CIMV process using acetic acid/formic acid/water Source: C. Vanderghem et al. , ULg-Gx. ABT Temperature: 80°C (-1), 90°C (0), 107°C (1). FA/AA/W: 20/60/20 (-1) 30/50/20(0); 40/40/20 (1)
Oxidative delignification 1. Hydrogen peroxide treatment 2. Ozone treatment 3. Wet oxidation: treatment with oxygen or air in combination with water at high temperature and pressure
Room temperature ionic liquids Main cations and anions in ionic liquids
Room temperature ionic liquids Different types of interaction present in imidazolinium-based ionic liquids
Room temperature ionic liquids Proposed mechanism for cellulose dissolution in Emim. Ac
Room temperature ionic liquids Hydrolysis of cellulose in a mixture of cellulases and an ionic liquid (HEMA) +
Steam explosion Schematic of the steam explosion process. 1, sample charging valve; 2, steam supply valve; 3, discharge valve; 4, condensate drain valve
ULg-Gembloux Agro-Bio Tech steam explosion pilot plant (Source: N. Jacquet et al. )
ULg-Gembloux Agro-Bio Tech steam explosion pilot plant (Source: N. Jacquet et al. )
Ulg-Gx. ABT steam explosion pilot plant (Source: N. Jacquet et al. )
Ammonia pre-treatments 1. Ammonia fiber explosion (AFEX™): biomass is exposed to liquid ammonia at high temperature and pressure and then pressure is reduced 2. Ammonia recycle percolation (ARP): aqueous ammonia passes through biomass at high temperature, after which ammonia is recovered
What is AFEX™? Recovered Ammonia Recovery Ammonia vapor Heat Biomass Reactor Expansion Explosion Treated Biomass Ammonia Fiber Expansion Process – Moist biomass is contacted with ammonia – Temperature and pressure are increased – Contents soak for specified time at temperature and ammonia load – Pressure is released – Ammonia is recovered and reused AFEX™ is a trademark of MBI
Biomass Conversion for Different Feedstocks Before and After AFEX Glucan conversion for various AFEX treated Feed stocks Switchgrass Corn stover Sugarcane Bagasse Rice straw Miscanthus DDGS Glucan conversion after enzymatic hydrolysis UT=No Pretreatment AFEX=Ammonia Pretreatment Excellent Biomass Conversion After AFEX Pretreatment
Carbon dioxide explosion High pressure carbon dioxide, and particularly supercritical carbon dioxide is injected into the reactor and then liberated by an explosive decompression
Mechanical/alkaline pre-treatment Continuous mechanical pre-treatment with the aid of an alkali
Biological pre-treatments White-rot fungi are the most efficient in causing lignin degradation Source: L. Goodeve, 2003 Source: R. A. Blanchette, 2006
Performance summary Pretreatment Decrystallization of cellulose Removal of hemicelluloses Removal of lignin Inhibitor formation Liquid hot water 1) XX XX Weak acid 1) XX XX Alkaline X XX Organosolv X 3 XX X XX Wet oxidation XX Steam explosion* 1) XX Ammonia fiber explosion (AFEX) XX X CO 2 explosion XX XX XX Mechanical/alkaline X XX Biological XX XX XX: Major effect; X: Minor effect; ; *: increases crystallinity; 1) alters lignin structure Inhibitors: furfural from hemicelluloses and hydroxymethylfurfural from cellulose and hemicelluloses
Performance summary 1. All pretreatments partially or totally remove hemicelluloses 2. Wet oxidation, AFEX and CO 2 explosion reduce cellulose crystallinity 3. Alkaline, organosolv, wet oxidation, mechanical/alkaline and biological partially or totally remove lignin 4. High amounts of fermentation inhibitors are formed with liquid hot water, weak acid and steam explosion
ECONOMIC ANALYSIS: OPEX (Minimum Ethanol Selling Price), CAPEX Pretreatment OPEX ($/gal Et. OH) CAPEX ($/gal annual capacity) Liquid hot water 1. 65 4. 57 Weak acid 1. 35 3. 72 Alkaline 1. 60 3. 35 Ammonia fiber explosion (AFEX) 1. 40 3. 72 Ammonia recycle percolation (ARP) 1. 65 4. 56 Ideal 1. 00 2. 51 Organosolv Wet oxidation Steam explosion NB Enzyme cost: EUR 3/kg of produced cellobiose Source: Eggeman et al. , 2005
Thank you for your attention
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