WOOD PULPING USING IONIC LIQUIDS
With the inevitable depletion of petroleum-based resources, there has been an increasing worldwide interest in finding alternative resources, particularly from renewable resources including lignocellulosic biomass. Clean separation of the three major components of biomass (cellulose, lignin, and hemicellulose) becomes important and challenging for producing reproducible feedstocks for further chemical processing. This has been recognized by the United States Department of Energy as a Grand Challenge.1 One reason for the current limited biological and chemical approaches being taken to utilize biomass is the difficulty in processing lignocellulosic materials and the energy needed for separation of the components.1,2 Lignin, a three-dimensional amorphous polymer based on methoxylated phenylpropanoid units, is covalently bonded to carbohydrates in the plant, and therefore crosslinks to different polysaccharides, conferring mechanical strength to the cell wall. 3 Dissolution and further separation is difficult because of this complex matrix in the plant cell walls. In 2002, our group4 reported that cellulose can be completely dissolved in Ils and more recently that wood chips can be completely dissolved in Ils..5 It has also been shown that Ils can dissolve a large number of other biomacromolecules, such as silk fibroin,6 lignin,7 starch and zein protein, 8 chitin/chitosan, 9 , 10 wool keratin,11 etc., with high efficiency. Interestingly, after IL processing: dissolution and reconstitution, the crystallinity of cellulose can be efficiently reduced, which facilitates enzymatic hydrolysis.12 This paper will describe our current project on biomass processing and discuss how Ils provide new opportunities for not only processing, but utilization of biomass for chemicals, fuels, and new materials.
ionic liquid wood pulping biomass dissol ution/regeneration biorefinery
Sun Ning Jiang Xinyu Li Weiying Lu Xingmei Robin D. Rogers
Center for Green Manufacturing and Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487 USA
国际会议
广州
英文
6-9
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）