A comparison of aqueous and dilute-acid single-temperature pretreatment of yellow poplar sawdust

被引:67
作者
Allen, SG [1 ]
Schulman, D
Lichwa, J
Antal, MJ
Jennings, E
Elander, R
机构
[1] Univ Hawaii Manoa, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA
[2] Natl Renewable Energy Lab, Golden, CO 80401 USA
关键词
D O I
10.1021/ie000579+
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Pretreatment of fresh yellow poplar sawdust (< 6 mm, 25-30 wt % moisture) with hot: liquid water (190-220 degreesC, 2.0-7.5 min, 2-7 wt % solids loading) or steam (220 degreesC, 2.0 min) was compared with dilute acid pretreatment (0.8% w/v sulfuric acid, 175 degreesC, 10 min, 20-25 wt % solids loading). The most favorable conditions for hot liquid water pretreatment (220 degreesC, 2.0 min, 5 wt % solids loading) performed as well as the dilute acid pretreatment (175 degreesC, 10.0 min, 0.8% sulfuric acid, 20 wt % solids loading) for fermentation of the cellulosic fraction of the pretreated fibers by simultaneous saccharification and fermentation (SSF), using Saccharomyces cerevisiae and 25 IFPU cellulase/g of cellulose. Ethanol yields of 97 and 92 wt % of the theoretical yield and xylan recoveries of 85 and 70 wt % (92 and 96 wt % solubilization) were achieved with the hot liquid water and dilute acid pretreatments, respectively. Steam pretreatment (220 degreesC, 2 min) was not as effective as the dilute acid pretreatment, resulting in an ethanol yield of 70 wt % of the theoretical yield, with 88 wt % xylan recovery (54 wt % solubilization). A positive correlation was found between xylan removal and the ethanol yield obtained by SSF. Xylan recovery, however, was inversely proportional to xylan solubilization. Removal of up to 57 wt % of the acid-insoluble lignin in yellow poplar was also possible with hot liquid water pretreatment, with 75 wt % of this acid-insoluble lignin recoverable by simple filtration of the liquid pretreatment products.
引用
收藏
页码:2352 / 2361
页数:10
相关论文
共 55 条
[1]   DILUTE ACID-HYDROLYSIS OF LIGNOCELLULOSICS - AN APPLICATION TO MEDIUM CONSISTENCY SUSPENSIONS OF HARDWOODS USING A PLUG FLOW REACTOR [J].
ABATZOGLOU, N ;
KOEBERLE, PG ;
CHORNET, E ;
OVEREND, RP ;
KOUKIOS, EG .
CANADIAN JOURNAL OF CHEMICAL ENGINEERING, 1990, 68 (04) :627-638
[2]  
Adney B., 1996, MEASUREMENT CELLULAS
[3]   Fractionation of sugar cane with hot, compressed, liquid water [J].
Allen, SG ;
Kam, LC ;
Zemann, AJ ;
Antal, MJ .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1996, 35 (08) :2709-2715
[4]  
ALLEN SG, 1997, DEV THERMOCHEMICAL B, P765
[5]  
ALLEN SG, 2001, UNPUB IND ENG CHEM R
[6]   FRACTIONATION AND BIOCONVERSION OF STEAM-EXPLODED WHEAT STRAW [J].
BELTRAME, PL ;
CARNITI, P ;
VISCIGLIO, A ;
FOCHER, B ;
MARZETTI, A .
BIORESOURCE TECHNOLOGY, 1992, 39 (02) :165-171
[7]   HYDROTHERMAL DEGRADATION OF POLYMERS DERIVED FROM PLANTS [J].
BOBLETER, O .
PROGRESS IN POLYMER SCIENCE, 1994, 19 (05) :797-841
[8]   DYNAMIC HYDROTHERMAL DEGRADATION OF WOOD [J].
BOBLETER, O ;
BINDER, H .
HOLZFORSCHUNG, 1980, 34 (02) :48-51
[9]  
Bobleter O., 1979, CELLUL CHEM TECHNOL, V13, P583
[10]  
BOBLETER O, 1968, Patent No. 263661