THERMOCHEMICAL PRETREATMENT OF LIGNOCELLULOSE TO ENHANCE METHANE FERMENTATION .1. MONOSACCHARIDE AND FURFURALS HYDROTHERMAL DECOMPOSITION AND PRODUCT FORMATION RATES

被引:104
作者
BAUGH, KD [1 ]
MCCARTY, PL [1 ]
机构
[1] STANFORD UNIV,INST ENVIRONM ENGN & SCI,DEPT CIVIL ENGN,STANFORD,CA 94305
关键词
BIOREACTORS - Fermenters - CHEMICAL REACTIONS - Hydrolysis - FURFURAL - Decomposition - METHANE - Fermentation - SUGARS - Decomposition;
D O I
10.1002/bit.260310109
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Over a pH range 1-4 and temperatures from 170 to 230 degree C, the decomposition rates of xylose, galactose, mannose, glucose, 2-furfural, and 5-hydroxymethyl-2-furfural (5-HMF) were pseudo first order. The effect of temperature and pH on the pseudo first-order decomposition rate constants was modeled using the Arrhenius equation and acid-base catalysis, respectively. Decomposition rates of the monosaccharides were minimum at a pH 2-2. 5. Above pH 2. 5, the monosaccharide decomposition was base catalyzed, with acid catalysis occurring at a pH of less than 2 for glucose. The furfurals were subject to acid calysis at below 2. 5. Above pH 2. 5, the monosaccharide decomposition was base catalyzed, with acid catalysis occurring at a pH of less than 2 for glucose. The furfurals were subject to acid catalysis below ca. pH 3. 5. The hydrothermal conversion of glucose to its decomposition products during thermochemical pretreatment can be modeled as a combination of series and parallel reactions. The formation rates of identified soluble products from glucose decomposition, 5-HMF and levulinic acid, were also functions of temperature and pH. The rate of 5-HMF formation relative to glucose decomposition decreased as the pH increased from 2. 0 to 4. 0, with levulinic acid formation only detected when the pH was 2. 5 or less. For glucose decomposition, humic solids accounted for ca. 20% of the decomposition products.
引用
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页码:50 / 61
页数:12
相关论文
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