Thermal and time regularities during oilseed rape straw liquefaction process to produce bio-polyol

摘要

Thermal and time regularities of oilseed rape straw (OS) liquefaction to produce bio-polyol were investigated by changing reaction temperature and time. When liquefying OS at 150 degrees C for 40 min, 98.4% of bio-polyol and 0.8% of residue are obtained. Liquefied products were analyzed by Fourier Transform Infrared Spectroscopy (FT-IR), Two dimensional correlate spectroscopy (2D-COS) IR, Thermogravimetric Analysis (TGA) and Gel Permeation Chromatography (GPC) to explore underlying regularities. OS degradation is promoted from 100 to 150 degrees C or from 10 to 40 min, but re-polymerization becomes more active when increased temperature or time continuously. OS components containing potential reactive groups are transformed into bio-polyol while ash is concentrated in residue. Conversion of C=O and C=C groups needs lower temperature or short time than transforming of CeH and OeH groups. C-C and aromatic ring (-Ar-) are most active towards temperature and time as external perturbation respectively. Bio-polyol degrades or evaporates in five regions between 30 and 600 degrees C and is composed of four parts of components with different molecular weight (Mw). This research is valuable to guide biomass conversion and bio-polyol application, which gives insight to use biomass efficiently and environmentally. (C) 2020 Elsevier Ltd. All rights reserved.