Ifp Energies Nouvelles

Larissa Perotta

Caroline Aymard

Sylvain Louret

Eszter Toth

Stephanie Fleurier

Pierre-Antoine Bouillon

Pierre Antoine Bouillon

The invention concerns a method for treating lignocellulosic biomass, said method comprising the following steps: a, Preparing an impregnation liquor () containing a chemical catalyst intended to impregnate the biomass b. Introducing the crushed biomass () through an inlet of an impregnation reactor (), said inlet being situated in a first impregnation area () of said impregnation reactor that comprises two superposed areas, said first impregnation area and a second so-called dewatering area () above the impregnation area c. Introducing the liquor () through a first liquor inlet situated in said first impregnation area () of the reactor, d. Introducing said liquor () into said reactor through a second liquor inlet in another area of the reactor () situated below the biomass inlet in the first impregnation area (). The invention also concerns the facility for implementing the method.

Method for treating lignocellulosic biomass

The process for the production of alcohol and/or solvent from a biomass feedstock comprises the stages for pretreatment (P) of the biomass feedstock, for enzymatic hydrolysis (Hand HF), and for fermenting the hydrolyzate (HF). To prevent solids from being sent and to facilitate operating the section for purifying the fermentation products, at least a portion of the solid material in the fermentation wine is extracted (Ex) to obtain a stream of solid residue () comprising lignin and a fermentation wine () that is low in solid material. Then, the stream of solid residue is washed (L) with a liquid stream to recover a liquid stream that is enriched with fermentation products (). The liquid stream that is enriched with fermentation products () is recycled in the enzymatic hydrolysis stage (H) to recover any fermentation product and to increase the overall yield of the process.

Method for producing alcohols and/or solvents from lignocellulosic biomass with washing of the solid residue obtained after fermentation

The process for the production of alcohol and/or solvent from a biomass feedstock comprises the stages for pretreatment (P) of the biomass feedstock, for enzymatic hydrolysis (H) of the pretreated substrate, and for fermenting the hydrolyzate (F). To reduce the size of the fermenters, at least a portion of the solid residue contained in the hydrolyzate is extracted (Ex) in such a way as to obtain a stream of solid residue () comprising lignin and a hydrolyzate () that is low in solid residue. Then, the stream of solid residue is washed (L) with a liquid stream in such a way as to recover a sugar-enriched liquid stream (). The sugar-enriched liquid stream () is recycled in the enzymatic hydrolysis stage (H) to be able to upgrade the sugars without providing dilution of the streams in the process.

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Lyons, France

Larissa Perotta