Lime pretreatment of switchgrass

  • Vincent S. Chang
  • Barry Burr
  • Mark T. Holtzapple
Session 1 Thermal, Chemical, and Biological Processing

DOI: 10.1007/BF02920408

Cite this article as:
Chang, V.S., Burr, B. & Holtzapple, M.T. Appl Biochem Biotechnol (1997) 63: 3. doi:10.1007/BF02920408

Abstract

Lime (calcium hydroxide) was used as a pretreatment agent to enhance the enzymatic digestibility of switchgrass. After studying many conditions, the recommended pretreatment conditions are: time = 2 h, temperature = 100°C and 120°C, lime loading = 0.1 g Ca(OH)2/g dry biomass, water loading = 9 mL/g dry biomass. Studies on the effect of particle size indicate that there was little benefit of grinding below 20 mesh; even coarse particles (4–10 mesh) digested well. Using the recommended pretreatment conditions, the 3-d reducing sugar yield was five times that of untreated switchgrass, the 3-d total sugar (glucose + xylose) yield was seven times, the 3-d glucose yield was five times, and the 3-d xylose yield was 21 times. A material balance study showed that little glucan (approx 10%) was solubilized as a result of the lime pretreatment, whereas about 26% of xylan and 29% of lignin became solubilized.

Index Entries

Lignocellulose pretreatment lime cellulase sugar 

Copyright information

© Humana Press Inc. 1997

Authors and Affiliations

  • Vincent S. Chang
    • 1
  • Barry Burr
    • 1
  • Mark T. Holtzapple
    • 1
  1. 1.Department of Chemical EngineeringTexas A&M University

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