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Title:
PROCESS FOR PRODUCING BIOETHANOL BY ENZYMATIC HYDROLYSIS OF CELLULOSE
Document Type and Number:
WIPO Patent Application WO/2012/049054
Kind Code:
A3
Abstract:
The invention concerns a process for producing bioethanol comprising the steps of pretreatment (consisting in destructuring the lignocellulosic vegetable raw material by placing it in the presence of a mixture containing formic acid, acetic acid and water, then in separating cellulose), of enzymatic hydrolysis and of alcoholic fermentation, characterized in that it comprises, prior to the enzymatic hydrolysis, a step of partial elimination of the lignins so as to obtain a residual overall level of lignins (T), expressed as percentage by weight, which is non-zero and which is included in a range determined by a lower limit, and an upper limit Bsup, respectively equal to 0.30% and 4%. In order to obtain conditions of acidification before the enzymatic hydrolysis step, the process comprises a step for re- acidification of the mixture, which is carried out by means of an acid, or of a mixture of acids, of determined pKa, and in particular by means of weak organic acids such as acetic acid and/or formic acid.

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Inventors:
DELMAS MICHEL (FR)
BENJELLOUN MLAYAH BOUCHRA (FR)
Application Number:
PCT/EP2011/067391
Publication Date:
July 05, 2012
Filing Date:
October 05, 2011
Export Citation:
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Assignee:
CIE IND DE LA MATIERE VEGETALE CIMV (FR)
DELMAS MICHEL (FR)
BENJELLOUN MLAYAH BOUCHRA (FR)
International Classes:
C12P7/10; C13K1/02
Domestic Patent References:
WO2009092749A12009-07-30
WO2008065433A12008-06-05
WO2001032715A12001-05-10
WO2010060183A12010-06-03
Foreign References:
CN102153763A2011-08-17
US20080026431A12008-01-31
CN101787384A2010-07-28
Other References:
BURANOV A U ET AL: "Lignin in straw of herbaceous crops", INDUSTRIAL CROPS AND PRODUCTS, ELSEVIER, NL, vol. 28, no. 3, 1 November 2008 (2008-11-01), pages 237 - 259, XP023980748, ISSN: 0926-6690, [retrieved on 20080821], DOI: 10.1016/J.INDCROP.2008.03.008
Attorney, Agent or Firm:
KOHN, Philippe et al. (30 rue Hoche, Pantin, FR)
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