Abstract:
A process for pretreatment of lignocellulosic biomass by a) A stage for acid hydrolysis of the biomass by an acid solution leading to a liquid fraction and to a solid fraction, b) A stage for separation of the solid fraction and the liquid fraction, c) A stage for drying the solid fraction, d) A stage for baking the solid fraction that is dried in a medium by a hydrated inorganic salt of formula: MXn.n′H2O in which M is a metal of groups 1 to 13 of the periodic table, X is an anion, and n is an integer between 1 and 6, and n′ is between 0.5 and 12, making it possible to obtain a solid fraction and a liquid fraction, e) A stage for separation of the solid fraction and the liquid fraction obtained in stage d).
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).