Search International and National Patent Collections

1. (WO2010111775) FED BATCH PROCESS FOR BIOCHEMICAL CONVERSION OF LIGNOCELLULOSIC BIOMASS TO ETHANOL

Pub. No.:    WO/2010/111775    International Application No.:    PCT/CA2010/000456
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Thu Apr 01 01:59:59 CEST 2010
IPC: C12P 19/14
C12P 19/00
Applicants: GREENFIELD ETHANOL INC.
BENSON, Robert, Ashley, Cooper
BENECH, Régis-Olivier
Inventors: BENSON, Robert, Ashley, Cooper
BENECH, Régis-Olivier
Title: FED BATCH PROCESS FOR BIOCHEMICAL CONVERSION OF LIGNOCELLULOSIC BIOMASS TO ETHANOL
Abstract:
A method for optimization of a fed-batch lignocellulosic biomass hydrolysis process wherein the hydrolysis time is minimized by controlling the feed addition volume and / or batch addition frequency of prehydrolysed lignocellulosic feed and optionally the enzyme feed. The increase over time in hydrolysate consistency and volume and / or concentration of sugars released in the reactor, so that the enzymatic hydrolysis is controlled, significantly reduces the impact of cellulase feedback inhibition, especially for enzyme contents lower than 0.5%. The overall time to reach conversion of the total prehydrolysate feed is reduced significantly where the batch addition frequency is equal to one batch each time 70% to 90% of a theoretical cellulose to glucose conversion is reached, preferably when 80% conversion is reached. At an enzyme load of 0.3% in the reaction mixture, the optimum frequency each time 80% conversion was reached was found to be one batch every 105 minutes.