PROCESS FOR PRETREATMENT OF THE LIGNOCELLULOSIC BIOMASS WITH A HYDRATED INORGANIC SALT MAKING IT POSSIBLE TO OBTAIN A CELLULOSIC FRACTION AND A HEMICELLULOSIC FRACTION
First Claim
1. Process for pretreatment of the lignocellulosic biomass comprising the following stages:
- a) A stage for acid hydrolysis of the biomass by an acid solution leading to a liquid fraction that contains the bulk of the hemicellulose in the form of products of hydrolysis and acid and to a solid fraction containing the bulk of the cellulose and the lignin,b) A stage for separating the solid fraction and the liquid fraction obtained in stage a),c) A stage for drying the solid fraction obtained in stage b),d) A stage for baking the dried solid fraction obtained in stage c) in the presence of or in the absence of an organic solvent, in a medium comprising at least one hydrated inorganic salt of Formula (I);
MXn′
n′
H2Oin whichM is a metal selected from the groups 1 to 13 of the periodic table,X is an anion, andn is an integer between 1 and 6, and withn′
being between 0.5 and 12,making it possible to obtain a solid fraction and a liquid fraction containing the hydrated inorganic salt,e) A stage for separating the solid fraction and the liquid fraction obtained in stage d),f) Optionally, a stage for treatment of the solid fraction obtained in stage e),g) A stage for enzymatic hydrolysis of said solid fraction obtained from stage e) and/or f),and in which at least a portion of the liquid fraction obtained in stage b) is used for the growth of the microorganism that produces enzymes necessary for the enzymatic hydrolysis of stage g).
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Abstract
A method for pretreating lignocellulosic biomass by: a) acid hydrolysis with an acid solution resulting in a liquid fraction and a solid fraction, b) separating the solid fraction and the liquid fraction, c) drying the solid fraction, d) firing the dried solid fraction in a medium comprising at least one hydrated inorganic salt to obtain a solid fraction and a liquid fraction, e) separating the solid fraction and the liquid fraction obtained in d), f) optionally, treating said solid fraction obtained in e), g) enzymatic hydrolysis of said solid fraction obtained in e) and/or f), and wherein at least a portion of the liquid fraction obtained in b) is used to grow microorganisms which produce the enzymes necessary for the enzymatic hydrolysis of g).
3 Citations
15 Claims
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1. Process for pretreatment of the lignocellulosic biomass comprising the following stages:
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a) A stage for acid hydrolysis of the biomass by an acid solution leading to a liquid fraction that contains the bulk of the hemicellulose in the form of products of hydrolysis and acid and to a solid fraction containing the bulk of the cellulose and the lignin, b) A stage for separating the solid fraction and the liquid fraction obtained in stage a), c) A stage for drying the solid fraction obtained in stage b), d) A stage for baking the dried solid fraction obtained in stage c) in the presence of or in the absence of an organic solvent, in a medium comprising at least one hydrated inorganic salt of Formula (I);
MXn′
n′
H2Oin which M is a metal selected from the groups 1 to 13 of the periodic table, X is an anion, and n is an integer between 1 and 6, and with n′
being between 0.5 and 12,making it possible to obtain a solid fraction and a liquid fraction containing the hydrated inorganic salt, e) A stage for separating the solid fraction and the liquid fraction obtained in stage d), f) Optionally, a stage for treatment of the solid fraction obtained in stage e), g) A stage for enzymatic hydrolysis of said solid fraction obtained from stage e) and/or f), and in which at least a portion of the liquid fraction obtained in stage b) is used for the growth of the microorganism that produces enzymes necessary for the enzymatic hydrolysis of stage g). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification