Effect of Different Solvents on Cypress Liquefaction to Fuels and Characterization of Products

Abstract

This study investigated the effects of various solvents on cypress liquefaction in the range of 180 to 300 °C. The solid residues and bio-oils obtained from cypress liquefaction were characterized to investigate the mechanism of the liquefaction process. Results obtained using FT-IR, sugar analysis, and elemental analysis showed that the solvent could affect both the formation of various compounds in the bio-oil and the product distribution during the cypress liquefaction process. Considering the bio-oil yield, the solvent efficiency in cypress liquefaction was as follows: water > methanol > ethanol. The decomposition velocities of cellulose, hemicelluloses, and lignin were different in the solvents, and hemicellulose decomposition preceded cellulose and lignin in all solvents. Water had the most pronounced effect on the higher heating value (HHV) of residues among the three tested solvents; the highest HHV was 26.3 MJ/Kg. This study suggests that characterization of products provides a promising approach for investigating the mechanism of solvent effects on biomass liquefaction.

Dietary Fiber Extraction from Defatted Corn Hull by Hot-Compressed Water

“…The defatted corn hull was dried at 105°C for 24 h and kept in desiccators at room temperature before used. The composition analysis of defatted corn hull was performed according to Liu et al [2013]. The total dietary fi ber was determined according to AOAC method 985.…”

Investigation of cornstalk cellulose liquefaction in supercritical acetone by FT-TR and GC-MS methods

“…It has been found that more chemical materials can be obtained in supercritical acetone than in supercritical ethanol under the same reaction condition. Meanwhile, the solvent could affect the formation of various compounds in the bio-oil (26,27). To best of our knowledge, there have been few studies about the mechanism of cellulose liquefaction in supercritical acetone, and the selectivity of acetone on platform chemicals formation in bio-oil is also not clarified.…”