| abstract |
The present invention relates to a process for treating lignocellulosic biomass comprising, successively, b) a step of pretreatment of the biomass previously placed under acidic conditions or at neutral pH in a pretreatment reactor (3), to produce an acid pretreated marc ( MA) or neutral, alternating with b ') a step of pretreatment of the biomass previously placed under acidic, neutral or basic conditions, with possible sufficient introduction into the pretreatment reactor (3) of a basic aqueous solution (EB) , to produce a basic pretreated marc (MB), puisc) an enzymatic hydrolysis step in a hydrolysis reactor (16) of a mixture of the acid pretreated marc (MA) or neutral marc from step b) with the basic pretreated marc (MB) from step b '). Figure 1 to be published |