Atmospheric pressure liquefaction of dried distillers grains (DDG) and making polyurethane foams from liquefied DDG.
In this study, dried distillers grains (DDG) was liquefied in acidic conditions at atmospheric pressure, and polyurethane foams were subsequently prepared from the liquefied DDG. Liquefaction was examined over a range of conditions including liquefaction time of 1-3 h, temperature of 150-170 degrees C, sulfuric acid (as catalyst) concentration of 1.0-3.0 wt%, and liquefaction solvent (ethylene carbonate) to DDG ratio of 3:1-5:1. The bio-polyols in the liquefied DDG were rich in hydroxyl groups, which can react with methylene diphenyl diisocyanate (MDI) to form cross-linked polyurethane networks. The biodegradability of the prepared polyurethane foams was also evaluated. This study strives to broaden the application of DDG as a feedstock for bio-polyurethane preparation.
Yu
Fei
F
Department of Forest Products, Mississippi State University, Box 9820, Mississippi State, MS, 39762, USA.
Le
Zhiping
Z
Chen
Paul
P
Liu
Yuhuan
Y
Lin
Xiangyang
X
Ruan
Roger
R
D001274:Atmospheric Pressure; D005591:Chemical Fractionation / Q000379:methods*; D002523:Edible Grain / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D012996:Solutions
D005740:Gases; D011140:Polyurethanes; D012996:Solutions