title: Comparison of homogeneous and heterogeneous acid promoters in single-step aqueous-organosolv fractionation of eucalyptus wood chips.
abstract: Fractionation of lignocellulosic biomass is a primary step for converting multi-structure biomass to biofuels and other industrial products in integrated biorefinery processes. Here, the effects of homogeneous and heterogeneous acid promoters (HNO3-, HCl-, H2SO4-, and H3PO4-activated carbons) on Clean Fractionation (CF), a single-step aqueous-organosolv fractionation, of eucalyptus wood chips was studied and optimised. The optimised process contained 16.7% w/v biomass in a ternary mixture of methyl isobutyl ketone:methanol:water (25:42:33) with 5% AC-H3PO4 and incubated at 180 °C for 60 min. Under these conditions, 41.2 wt.% cellulose was obtained in enriched solid pulp with the average glucan content of 75.9%. The majority of the hemicelluloses was hydrolysed into the aqueous-methanol phase, which contained 17.8 wt.% monomeric xylose and xylooligomers while 13.7 wt.% lignin was separated into the organic phase. The heterogeneous acid-promoter process is a potent alternative to corrosive homogeneous acids for lignocellulose fractionation in integrated biorefineries.
authors.affiliation: The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand.
authors.forename: Thepparat
authors.initials: T
authors.lastname: Klamrassamee
authors.affiliation: Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand. Electronic address: verawat@biotec.or.th.
authors.forename: Verawat
authors.initials: V
authors.lastname: Champreda
authors.affiliation: SCG Chemicals, Map Ta Phut, Muang District, Rayong 21150, Thailand.
authors.forename: Vasimon
authors.initials: V
authors.lastname: Reunglek
authors.affiliation: The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand. Electronic address: navadol@jgsee.kmutt.ac.th.
authors.forename: Navadol
authors.initials: N
authors.lastname: Laosiripojana
mesh_terms: D000143:Acids / Q000737:chemistry*; D018533:Biomass; D005052:Eucalyptus / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000143:Acids; D012997:Solvents; D014867:Water
keywords: Biorefinery; Eucalyptus; Lignocellulose; Organosolv fractionation; Solid acid promoter