Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 6, Pages 3357-3367Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00429
Keywords
Phenolics; Ionic liquids; Extraction; Adsorption; Lignocellulosic biomass; Supercritical CO2
Categories
Funding
- Fundacao para a Ciencia e Tecnologia (FCT/MEC, Portugal) [SFRH/BD/90282/2012, IF/00424/2013]
- Associated Laboratory for Sustainable Chemistry-Clean Processes and Technologies-LAQV
- ERDF [POCI-01-0145-FEDER-007265]
- FCT
- CAPES [FCT/1909/27/2/2014/S, CAPES 371/14, 0005/2015, 23038.002463/2014-98, PVE 155/2012]
- FCT/MEC [UID/QUI/50006/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/90282/2012] Funding Source: FCT
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A sustainable process of valorization of lignocellulosic biomass exploring the extraction and separation of high value phenolic compounds was developed. A scale-up pretreatment and fractionation process of biomass assisted by 1-ethyl-3-methylimidazolium acetate ([emim][OAc]) ionic liquid (IL) was carried out at first. Thereafter, recovered IL formed a sample rich in phenolic compounds, which separation and purification was the main objective of the present work. The phenolic extraction from the recycled IL was studied employing adsorption methodology with specific polymeric resins. Amberlite XAD-7 and Silica C18 resins showed the highest extraction efficiency of phenolic compounds, while PVPP presented high selectivity toward tricin and a specific lignin fragment. Among the examined resins, Amberlite XAD-7 demonstrated the highest ratio of phenolic compounds extraction in comparison to IL. A residual quantity of IL was observed to remain in the extracted samples and this was overcome by applying supercritical CO2 extraction approach. Proposed methodology allowed to produce high purity main biomass fractions with IL-free extract of phenolic compounds in a green and more sustainable fashion with IL and CO2 processes employed.
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