Oxidative lime pretreatment of high-lignin biomass View Full Text


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Article Info

DATE

2001-04

AUTHORS

Vincent S. Chang, Murlidhar Nagwani, Chul-Ho Kim, Mark T. Holtzapple

ABSTRACT

Lime (Ca[OH]2) and oxygen (O2) were used to enhance the enzymatic digestibility of two kinds of high-lignin biomass: poplar wood and newspaper. The recommended pretreatment conditions for poplar wood are 150 degrees C, 6 h, 0.1 g of Ca(OH)2/g of dry biomass, 9 mL of water/g of dry biomass, 14.0 bar absolute oxygen, and a particle size of -10 mesh. Under these conditions, the 3-d reducing sugar yield of poplar wood using a cellulase loading of 5 filter paper units (FPU)/g of raw dry biomass increased from 62 to 565 mg of eq. glucose/g of raw dry biomass, and the 3-d total sugar (glucose + xylose) conversion increased from 6 to 77% of raw total sugars. At high cellulase loadings (e.g., 75 FPU/g of raw dry biomass), the 3-d total sugar conversion reached 97%. In a trial run with newspaper, using conditions of 140 degrees C, 3 h, 0.3 g of Ca(OH)2/g of dry biomass, 16 mL of water/g of dry biomass, and 7.1 bar absolute oxygen, the 3-d reducing sugar yield using a cellulase loading of 5 FPU/g of raw dry biomass increased from 240 to 565 mg of eq. glucose/g of raw dry biomass. A material balance study on poplar wood shows that oxidative lime pretreatment solubilized 38% of total biomass, including 78% of lignin and 49% of xylan; no glucan was removed. Ash increased because calcium was incorporated into biomass during the pretreatment. After oxidative lime pretreatment, about 21% of added lime could be recovered by CO2 carbonation. More... »

PAGES

1-28

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1385/abab:94:1:01

    DOI

    http://dx.doi.org/10.1385/abab:94:1:01

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1030519216

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/11393353


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