Next Article in Journal
Modelling and Internal Fuzzy Model Power Control of a Francis Water Turbine
Next Article in Special Issue
A Review of Thermal Co-Conversion of Coal and Biomass/Waste
Previous Article in Journal
Convex Optimization for the Energy Management of Hybrid Electric Vehicles Considering Engine Start and Gearshift Costs
Previous Article in Special Issue
Fractionation for Biodiesel Purification Using Supercritical Carbon Dioxide
Energies 2014, 7(2), 857-873; doi:10.3390/en7020857
Article

Impact of Hot-Water Extraction on Acetone-Water Oxygen Delignification of Paulownia Spp. and Lignin Recovery

 and
*
Received: 9 December 2013 / Revised: 7 February 2014 / Accepted: 17 February 2014 / Published: 19 February 2014
(This article belongs to the Special Issue Biomass and Biofuels 2013)
View Full-Text   |   Download PDF [606 KB, uploaded 17 March 2015]   |   Browse Figures

Abstract

A hardwood-based biorefinery process starting with hot-water extraction (HWE) is recommended in order to remove most of the hemicelluloses/xylans before further processing. HWE may be followed by delignification in acetone/water in the presence of oxygen (AWO) for the production of cellulose and lignin. In this study, the HWE-AWO sequence was evaluated for its effectiveness at removing lignin from the fast-growing species Paulownia tomentosa (PT) and Paulownia elongata (PE), in comparison with the reference species, sugar maple (Acer saccharum, SM). HWE might lead to a remarkable increase in lignin accessibility, and as a result, a greater AWO delignification degree was observed for extracted PT, PE, and SM than for unextracted ones. Organosolv lignin was recovered from the spent liquor of AWO delignification of PT with/without prior HWE and characterized to evaluate the benefits of HWE on the lignin structure and purity. The lignin recovered from the spent liquor of HWE-AWO sequence is of higher purity and lighter color than that recovered from the AWO spent liquor. These properties along with low sulfur content are desirable for lignin high-value applications.
Keywords: hot-water extraction; acetone-water oxygen delignification; Paulownia tomentosa; Paulownia elongata; Acer saccharum; organosolv lignin hot-water extraction; acetone-water oxygen delignification; Paulownia tomentosa; Paulownia elongata; Acer saccharum; organosolv lignin
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

Gong, C.; Bujanovic, B.M. Impact of Hot-Water Extraction on Acetone-Water Oxygen Delignification of Paulownia Spp. and Lignin Recovery. Energies 2014, 7, 857-873.

View more citation formats

Article Metrics

For more information on the journal, click here

Comments

Cited By

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert