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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; in revised form: 7 February 2014 / Accepted: 17 February 2014 / Published: 19 February 2014
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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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.

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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.

AMA Style

Gong C, Bujanovic BM. Impact of Hot-Water Extraction on Acetone-Water Oxygen Delignification of Paulownia Spp. and Lignin Recovery. Energies. 2014; 7(2):857-873.

Chicago/Turabian Style

Gong, Chen; Bujanovic, Biljana M. 2014. "Impact of Hot-Water Extraction on Acetone-Water Oxygen Delignification of Paulownia Spp. and Lignin Recovery." Energies 7, no. 2: 857-873.


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