Vegetos

Abstract

An efficient organic solvent system was formulated in this study to isolate the cellulose and lignin of Poplar from Hebei. The lignin solvency of ethanol was enhanced by 4-methyl-2-pentanone, dimethyl sulfoxide (DMSO) and formic acid. The holocellulose and α-cellulose contents of the isolated cellulose were tested with the methods of Chinese National Standards GB/T 2677.10–1995 and GB/T 744–2004. Isolated cellulose was characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRD). The chemical structural of the separated lignin was tested by nuclear magnetic resonance (13C-NMR). The holocellulose content of the separated cellulose was 96.07% and the content of α-cellulose was 90.71%. The chemical and crystal structures of isolated cellulose were affected somewhat by the organic solvent system. The condensation of guaiacyl units and the decomposition of β-O-4 units were the main features of the isolated lignin.