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A process for producing lignin and volatile compounds from hydrolysis liquor
Tooran Khazraie1, Yiqian Zhang2, Dmitry Tarasov2
1Johan Gadolin Process Chemistry Center, Laboratory of Inorganic Chemistry, Åbo Akademi University, Piispankatu 8, 20500 Turku, Finland.
Biotechnology for Biofuels
|March 3, 2017
Summary
Acidification effectively extracts furfural, acetic acid, and lignin compounds from wood hydrolysis liquor. This process yields purified lignin with a high glass transition temperature, offering valuable by-products from a dilute stream.
Area of Science:
- Biomass valorization
- Chemical engineering
- Wood chemistry
Background:
- Hot water hydrolysis of wood chips generates a dilute by-product liquor.
- Extracting value-added products from this dilute liquor presents significant challenges.
Purpose of the Study:
- To develop a method for extracting valuable compounds from hot water hydrolysis liquor.
- To characterize the extracted lignin and volatile compounds.
Main Methods:
- Acidification of the hydrolysis liquor to precipitate compounds.
- Characterization of thermal properties of precipitates.
- Membrane dialysis for purification of lignin compounds.
Main Results:
- Acidification successfully extracted furfural, acetic acid, and lignin.
- Precipitates exhibited volatile characteristics.
- Purified lignin compounds showed a glass transition temperature (Tg) of 180-190 °C and thermal stability.
Conclusions:
- Lignin compounds in hydrolysis liquor possess distinct characteristics.
- Acidification is effective in separating volatile compounds from the liquor.
- A proposed process enables the production of purified lignin and volatile compound precipitates.
