Patent ID: 8883469

Claim:
A method of producing bioethanol by separating lignin from a crushed lignocelluloses biomass and obtaining cellulose and further processing of the cellulose or mixture of cellulose and hemicellulose to obtain sugars and subsequently obtain bioethanol, characterised in that crushed lignocelluloses biomass is treated with an alkanolamine as a solvent for extracting the lignin therein for at least 10 minutes at a temperature of about 80° C. to 150° C., the extraction of lignin carried out in the absence of caustic soda; the lignin solution is separated; the residue containing cellulose/hemicellulose is converted to sugars without drying; the sugars are fermented to obtain bioethanol; and wherein before the extraction of the lignin, the lignocellulose biomass is treated with ammonia gas or aqueous ammonia solution.