Journal
ENERGIES
Volume 7, Issue 2, Pages 857-873Publisher
MDPI
DOI: 10.3390/en7020857
Keywords
hot-water extraction; acetone-water oxygen delignification; Paulownia tomentosa; Paulownia elongata; Acer saccharum; organosolv lignin
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Funding
- USDA-McIntire-Stennis Enhancing production of uniform high purity lignin
- NSF-PFI-BIC: Technology Enhancement of Hot Water Extraction
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1237815] Funding Source: National Science Foundation
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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.
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