PROCESS FOR PRETREATMENT OF LIGNOCELLULOSIC BIOMASS WITH A HYDRATED INORGANIC SALT COMPRISING A PRELIMINARY ACID HYDROLYSIS STAGE

摘要

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′H2Oin whichM is a metal of groups 1 to 13 of the periodic table,X is an anion, andn is an integer between 1 and 6, andn′ 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).

主权项

1. Process for pretreatment of 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 hydrolysis products 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 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).