Wood vinegar and tar fraction in bio-oil produced from hazelnut shells pyrolysis at 400 C to 1,000 C — ScienceDaily
Biomass is attracting increasing interest from researchers as a source of renewable, sustainable and clean energy. It can be converted into bio-oil through thermochemical processes such as gasification, liquefaction and pyrolysis and used to make fuels, chemicals and biomaterials.
In the Journal for Renewable and Sustainable Energy, researchers from the Heilongjiang Academy of Agricultural Machinery Sciences in China share their work on the physico-chemical properties and the antioxidant activity of wood vinegar and tar fraction in bio-oil, which is obtained from the pyrolysis of hazelnut shells at 400 degrees Celsius to 1,000 C. . is won .
Commonly used in agriculture as an insect repellent, fertilizer, and plant growth promoter or inhibitor, wood vinegar can be used as an odor remover, wood preservative, and animal feed additive.
“According to these results, wood vinegar and tar made from residual hazelnut shells could be viewed as a potential source of renewable energy that depends on its own properties,” said author Liu Xifeng.
The researchers found that the wood vinegar and tar that were left over after the husks were burned contained the most phenolic substances, which laid the groundwork for subsequent research into its antioxidant properties.
The experiments were carried out in a tube furnace pyrolysis reactor and hazelnut shell samples weighing 20 grams were previously placed in the waiting area of a quartz tube. When the target temperature was reached and stable, the raw materials were pushed into the reaction area and heated for 20 minutes.
The biochar was determined as the ratio of pyrocoal and biomass weight and the bio-oil yield was calculated from the increased weight of the condenser.
In order to sufficiently separate two bio-oil fractions, the liquid product was centrifuged for eight minutes at 3,200 revolutions per minute and the aqueous fraction was called wood vinegar. The separated tar fraction remained stationary for 24 hours without the occurrence of the aqueous phase.
Wood vinegar and tar were each stored in a sealed tube and kept in a refrigerator at 4 ° C for the experimental analysis, and the gas yield was calculated taking their combined volume into account.
The researchers found that the pyrolysis temperature had a significant impact on the yield and properties of wood vinegar and tar fraction in bio-oil extracted from hazelnut shells. Wood vinegar was the dominant liquid fraction with a maximum yield of 31.23% by weight obtained at 700 ° C due to the high water concentration.
This research forms the basis for further applications of bio-oil from hazelnut shell pyrolysis, and its application to antioxidant activity has been expanded.
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