An effective fractionation process was sought to produce furfural and cellulose-rich solid from barley straw. Acidified zinc chloride (ZnCl2) was used as a catalyst in order to achieve hemicellulose recovery in the form of liquid hydrolysate. This fractionation process recovered 55.6% of XM (xylan and mannan) in the untreated barley straw under best reaction conditions (10% acidified ZnCl2, 150 ℃, 30 min, and 1/15 of S/L ratio). Hemicellulose hydrolysate was_x000D_ converted into furfural using hydrothermal reaction without additional catalyst. The furfural conversion yield at various reaction temperatures (150, 180, and 210 ℃) was in the range of 59.9-64.5%. The two parameters that affected performance in fractionation processing were reaction temperature and time. Reaction severity (Log R0) was used to evaluate the effects of two processing parameters on hemicellulose recovery. In the ZnCl2 treatment, the data indicated that the proper range of severity was 2.95-3.07 because the XM recovery yield decreased as the reaction condition became more severe beyond that point.

Barley Straw Fractionation Severity Factor ZnCl2 Hemicellulose

Wright JD, Power AJ, Biotechnol. Bioeng. Symp., 15, 511 (1985)
Wright JD, Power AJ, Bergeron PW, Evaluation of concentrated halogen acid hydrolysis processes for alcohol fuel production, SERI/TR-232-2386, Golden, CO, NREL (1985)
Mabee WE, Saddler JN, Bioresour. Technol., 101(13), 4806 (2010)
Pacific Northwest National Laboratory (PNNL)-National Renewable Energy Laboratory (NREL), Top value added chemicals from biomass: results of screening for potential candidates from sugars and synthesis gas, Department of Energy, Oak Ridge, TN (2010)
Ragauskas AJ, Williams CK, Davison BH, Britovsek G, Cairney J, Eckert CA, Sci., 311, 484 (2006)
National Renewable Energy Laboratory (NREL). http://www.nrel.gov.Accessed, July 20 (2012)
Sahoo S, Seydibeyoglu MO, Mohanty AK, Misra M, Biomass Bioenerg., 35(10), 4230 (2011)
Jung TS, Choi CH, Lee JY, Oh KK, Bioresour. Technol., 116, 435 (2012)
Choi CH, Um BH, Kim YS, Oh KK, Appl. Energy., 102, 640 (2013)
Park JY, Kang MS, Kim JS, Lee JP, Choi WI, Lee JS, Bioresour. Technol., 123, 707 (2012)
Nikitin NI, Isr. Program for Sci. Transl., 74 (1966)
Cao NJ, Xu Q, Chen CS, Gong CS, Chen LF, Appl. Biochem.Biotechnol., 45/46, 521 (1994)
Lu Q, Wang Z, Dong CQ, Zhang ZF, Zhang Y, Yang YP, Zhu XF, J. Anal. Appl. Pyrol., 91, 273 (2011)
Cao NJ, Xu Q, Chen LF, Appl. Biochem. Biotechnol., 51/52, 21 (1995)
Sluiter J, Sluiter A, Summative mass closure, NREL/TP-510-48087 (2011)
Sluiter A, Hames B, Ruiz R, Scarlata C, Sluiter J, Templeton D, Crocker D, Determination of structural carbohydrates and lignin in biomass, NREL/TP-510-42618 (2008)
Sluiter A, Hames B, Ruiz R, Scarlata C, Sluiter J, Templeton D, Determination of sugars, byproducts, and degradation products in liquid fraction process samples, NREL/TP-510-42623 (2008)
Overend RP, Chornet E, Philos. Trans. R. Soc., A321, 523 (1987)
Chum HL, Johnson DK, Black SK, Overend RP, Appl.Biochem. Biotechnol., 24/25, 1 (1990)
Yoo CG, Lee CW, Kim TH, Appl. Biochem. Biotechnol., 164(6), 729 (2011)
Kim TH, Lee YY, Appl. Biochem. Biotechnol., 137-140(1-12), 81 (2007)
Weiss ND, Nagle NJ, Tucker MP, Elander RT, Appl. Biochem. Biotechnol., 155(1-3), 418 (2009)
Mabee WE, Saddler JN, Bioresour. Technol., 101(13), 4806 (2010)
Zeitsch KJ, The chemistry and technology of furfural and its many by-products, Elsevier, Koln (2000)
Sangarunlert W, Piumsomboon P, Ngamprasertsith S, Korean J. Chem. Eng., 24(6), 936 (2007)