Patent ID: 11939721
Assignee: LIGNOPURA AGROTECH PVT LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D | IPC D

Claim 0:
1. A method for non-catalytic delignification of biomass, the method comprising the steps of:
adding a stream of water-washed cellulose-rich lignocellulosic biomass inside an apparatus; and
treating the stream with a treatment liquid in presence of an oxygen-containing gas in the apparatus at a temperature of 120-170° C. and at an initial pressure of 3 to 100 bar, wherein the treatment liquid is a mixture of water and an oxygenated solvent, wherein the treatment liquid comprises:
30-70% w/w of the oxygenated solvent comprising at least one of an ether, a ketone, and an ester group; and
30-70% w/w of water;
the oxygen-containing gas comprises 2 to 100% volume of oxygen, the oxygen-containing gas is either in the form of oxygen or air or a mixture of oxygen with an inert gas;
wherein the method produces pulp with a pulp quality of modified kappa number less than 15.