Ethanol production with dilute acid hydrolysis using...

C - Chemistry – Metallurgy – 12 – P

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C12P 7/08 (2006.01) C12P 7/10 (2006.01) C13K 1/02 (2006.01)

Patent

CA 2419658

a) acid-soaking, draining and dewatering a lignocllulosic biomass; b) first- stage hydrolysis at a temperature of from 130~C to 220~C and flashing hydrolysate in two consecutive tanks; c) recovering soluable sugars by a counter-current extractor; d) second-stage acid and metal salt impregnation and dewatering of washed-first stage solids; e) second-stage hydrolysis at a temperature from 190~C to 240~C and flashing hydrolysate in two consecutive tanks; f) first-stage fermentation of extract promoting yeasts growth; g) fermentation of second-stage hydrolysate and recovering the alcohol

L'invention concerne: a) le trempage dans l'acide, le drainage et l'asséchement d'une biomasse lignocellulosique; b) l'hydrolyse au premier niveau à une température allant de 130 ·C à 220 ·C et la vaporisation de l'hydrolysat dans deux réservoirs successifs; c) la récupération des sucres solubles par un extracteur à contre-courant; d) l'imprégnation au second niveau de sel métallique et d'acide et l'asséchement des solides lavés au premier niveau; e) l'hydrolyse au second niveau à une température allant de 190 ·C à 240 ·C et la vaporisation de l'hydrolysat dans deux réservoirs successifs; f) la fermentation au premier niveau d'extrait favorisant la croissance de levures; g) la fermentation au second niveau de l'hydrolysat et la récupération de l'alcool.

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