WOOD RESEARCH Volume 61, Number 1, 2016
Haiyan Yang, Zhengjun Shi, Liming Xiong, Kun Wang, and Run-Cang Sun

Ionic liquids assisted alkaline fractionation enhanced triploid poplar bioconversion for bioethanol production

In this case, [Amim]Cl, [Bmim]Cl and [Emim]Ac were used to dissolve ball-milled triploid poplar, and the cellulose-rich preparations were subsequently recovered via incubation in 5 % NaOH aqueous solution and filtration. After the stepwise pretreatments, the carbohydrate content in the cellulosic residues increased to 73.3, 73.6 and 79.0 %, respectively, from 66.1 % in that with sole alkali fractionation. In comparison, the treatment with [Emim]Ac incurred transformation of cellulose I to II, which was favorable to enhance the alkaline fractionation for lignin extraction and disruption of biomass intact structure. After reconstitution, the digestibility of the three cellulosic preparations was all improved, yielding 1.3-fold higher fermentable sugars than that without IL pretreatment (67.2 %). These results indicated that the stepwise pretreatment with ionic liquid and alkali was effective for disrupting the intact structure of plant cell wall, and improving the productivity of bioethanol from lignocellulose biomass.

WOOD RESEARCH Volume 62, Number 4, 2017
Mehmet Akgül, Birol Uner, Osman Çamlibel, and Ümit Ayata

Manufacture of medium density fiberboard (MDF) panels from agribased lignocellulosic biomass

Lignocellulosics fibers and commercially-manufactured-chip (Pinus sylvestris L., Fagus orientalis and Quercus robur L.) with 11% moisture conten twere used for the experiment. The mixingratios of lignocellulosics fibers was 20% which is from okra and tobaccos talks, hazelnut and walnuts hell, and pinecone for each mixture in preformed panel and commercially-manufactured-chip was 100 % for the control sample. A commercial ureaformaldehyde (UF) adhesive was used as a binder. The physical and mechanical properties such as density, thickness swelling (TS), bending strength (BS), modulus elasticity (MOE), internalbond (IB), screw holding ability (SHA) perpendicular to the plane of panel, Janka hardness perpendicular to the plane of panel properties of MDF were measured.The results indicated that all the panels met the general purpose-use requirements of TS-EN. Thus, our results suggest that biomass from different sources can be an alternative raw material for MDF manufacturing process.