Bi-REX: biomass treatment method with green solvents
Data di pubblicazione07-09-2019
Data di priorità01-01-1970
TitolarePolitecnico di Milano
DipartimentoDepartment of Chemistry Materials and Chemical Engineering
AutoriMele Andrea; Castiglione Franca; Ferro Monica; Colombo Dugoni Greta; Di Pietro Maria Enrica; Mannu Alberto; Panzeri Walter
It is an innovative and sustainable treatment for the recovery of high value biomass products, deriving from agro-industrial processing. It is based on a series of solubilizations and selective precipitations that use water, ethanol and eutectic solvents (DES) as solvents. DES are new eco-friendly solvents consisting of a hydrogen bonding acceptor and various hydrogen bonding donors, in this case choline acetate ([Ch] OAc) as a hydrogen bonding acceptor (HBA), in combination with various bonding donors to hydrogen (HBD), such as glycolic acid (GA), diglycolic acid (DA), levulinic acid (LA) and imidazole (IM).
The proposed process consists of the selective recovery of the biopolymer components and of the silica contained in the following biomasses: rice husk, rice straw, thistle and malt. The invention consists in treating the biomass with DES obtaining a precipitate enriched with cellulose and silica and a surnatant containing DES, hemicellulose and lignin. This last fraction can be further separated into lignin and hemicellulose. In principle, DES can be recovered and reused.