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

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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

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60

80

100

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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