Dual Pretreatment Strategy for Enhanced Biomass Hydrolysis
G. Brodeur, S. Ramakrishnan and J.C. Telotte
Department of Chemical and Biomedical EngineeringFAMU – FSU College of Engineering
1
DA Treatment
0
20
40
60
80
100
Um
, B.H
. et a
l., 2
003
Um
, B.H
. et a
l., 2
003
Sch
ell,
D.J
., et
al.,
200
3
Our
Wor
k
Silv
erst
ein,
R.A
., et
al.,
200
7
Jens
en, J
.R.,
et a
l., 2
010
Tian
, S.,
et a
l., 2
011
Wym
an, C
.E.,
et a
l., 2
011
Li, C
., et
al.,
201
0
Roc
ha, G
.M.,
et a
l., 2
011
Yoo
n, L
.W.,
et a
l., 2
011
Ged
des,
C.C
., et
al.,
201
0
Our
Wor
k
Zhan
g, J
., et
al.,
201
1
Glu
can
Con
vers
ion
(%)
Cor
n St
over
Cot
ton
Stal
k
Asp
en
Suga
rcan
e B
agas
se
Swee
t Sor
ghum
Bag
asse
Cor
n St
over
Cor
n St
over
Cor
n St
over
Asp
en
Switc
hgra
ss
Switc
hgra
ss
Suga
rcan
e B
agas
se
Suga
rcan
e B
agas
se
Suga
rcan
e B
agas
se
72
72
72
72
72
72
72
72
72
168
48
60
7296
Hydrolysis Time (hr)
Even at the highest conversion there is still >15% of the material that is left inaccessible
Dilute Acid Treatment (Pilot Plant) National Renewable Energy
Laboratory (NREL) Corn Stover: 190ᵒC; 1 min; 50
mg H2SO4/g dry biomass Florida Center for Renewable
Chemicals and Fuels (UF) Sugarcane Bagasse: 190ᵒC; 5
min; 0.5% w/w H3PO4
Pretreatment
Hemicellulose
Lignin
Cellulose
DA Treatment
2
N-methyl morpholine N-oxide (NMMO) monohydrate
Treatment Conditions Moderate temperatures (100ᵒC) Short dissolution times (<3 hours) High solids loadings (up to 20% w/w)
Petrovan et al., J. Appl. Polym. Sci. 2001 This work reports data for 3-5% (w/w)
Regeneration with anti-solvent (water) Benefits:
Highly effective cellulose treatment Reported ability to recycle over 99% of solvent Biodegradable
Raw feedstock will not completely dissolve
Amine Oxide Dissolution (NMMO)
N
O
H3C O
Cell OH
+
-
CellH
0
20
40
60
80
100
0 20 40 60 80 100
Glu
can
Con
vers
ion
(%)
Time (hr)
NMMO Treated alpha-celluloseuntreated alpha-cellulose
3
0
20
40
60
80
100
0 10 20 30 40 50 60 70 80
Glu
can
Con
vers
ion
(%)
Time (hr)
DAWNT-CS
DATCS
NTCS
CS
0
20
40
60
80
100
0 10 20 30 40 50 60 70 80G
luca
n C
onve
rsio
n (%
)
Time (hr)
DAWNT-SB
DATSB
NTSB
SB
Pretreatment Comparison
Corn Stover Sugarcane Bagasse
--Reaches maximum conversion of DATCS 48 hours faster!!
~98% Conversion ~91% Conversion
--Nearly complete conversion after 72 hours4
Increased Loadings & NMMO Recycle
Corn Stover Sugarcane Bagasse
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20
40
60
80
100
0 10 20 30 40 50 60 70 80
Glu
can
Con
vers
ion
(%)
Time (hr)
DAWNT-CS 1 % (w/w) hydrolysis solids loadingDAWNT-CS 5 % (w/w) hydrolysis solids loading
0
20
40
60
80
100
0 10 20 30 40 50 60 70 80
Glu
can
Con
vers
ion
(%)
Time (hr)
DAWNT-SB 1 % (w/w) hydrolysis solids loading DAWNT-SB 5 % (w/w) hydrolysis solids loading
50
20
40
60
80
100
0 10 20 30 40 50 60 70 80
Glu
can
Con
vers
ion
(%)
Time (hr)
Fresh NMMO1st Recycle NMMO2nd Recycle NMMO3rd Recycle NMMO