Bi-REX: biomass treatment method with green solvents

Data di pubblicazione

07-09-2019

Codice

CH.19.013.A

Stato

Licenziato

Data di priorità

01-01-1970

Fase

Italian

Titolare

Politecnico di Milano

Dipartimento

Department of Chemistry Materials and Chemical Engineering

Autori

Mele Andrea; Castiglione Franca; Ferro Monica; Colombo Dugoni Greta; Di Pietro Maria Enrica; Mannu Alberto; Panzeri Walter

Descrizione

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.

Campo di applicazione

<p> Biomass recycling; </p> <p> Extraction of high added value material such as cellulose, lignin hemicellulose and silica. </p>

Vantaggi

<p> Increase in the degree of crystallinity of cellulose; </p> <p> Separation of silica; </p> <p> DES contain only the elements Carbon, Hydrogen, Oxygen and Nitrogen useful for industrial disposal (combustion); </p> <p> DES halogen free; </p> <p> DES recyclability (closed cycle process). </p>

Stadio di sviluppo

Test in the lab

Contatto

licensing.tto@polimi.it