Abstract: The invention concerns a method for treating lignocellulosic biomass, said method comprising the following steps: a, Preparing an impregnation liquor (4) containing a chemical catalyst intended to impregnate the biomass b. Introducing the crushed biomass (6) through an inlet of an impregnation reactor (5), said inlet being situated in a first impregnation area (5a) of said impregnation reactor that comprises two superposed areas, said first impregnation area and a second so-called dewatering area (5b) above the impregnation area c. Introducing the liquor (4a) through a first liquor inlet situated in said first impregnation area (5a) of the reactor, d. Introducing said liquor (4b) into said reactor through a second liquor inlet in another area of the reactor (5d) situated below the biomass inlet in the first impregnation area (5b). The invention also concerns the facility for implementing the method.

Abstract: The subject of the invention is a process for treating lignocellulosic biomass comprising the following steps: a) conditioning the lignocellulosic biomass, b) washing said particles, c) separating the aqueous solution from the washed biomass particles, d) impregnating said lignocellulosic substrate with an acid liquor, e) carrying out a solid/liquid separation of the impregnated lignocellulosic substrate, f) pretreating said substrate from step e) by cooking, g) carrying out an enzymatic hydrolysis of the pretreated lignocellulosic substrate, h) carrying out a fermentation of the hydrolyzate from step g), and introducing the used aqueous washing solution into a step of said biomass treatment process which is after the pretreatment step f), and/or into an enzyme production step and/or into a step of producing/propagating the microorganisms necessary for steps g) or h).

Abstract: A process for producing cellulolytic and/or hemicellulolytic enzymes with a strain of microorganism belonging to the family of filamentous fungi. The process includes growing the fungi in an aqueous culture medium, in the presence of at least one carbon-based growth substrate, in a stirred and aerated bioreactor. It also includes the production of enzymes, starting with the aqueous culture medium in the presence of at least one inductive carbon-based substrate and also inducing the production of hydrophobins. Further, at least a portion of the hydrophobins produced in step (b) are reintroduced into the growth step (a).

Abstract: The present invention relates to a process for treating a lignocellulosic biomass pretreated beforehand (1), said process comprising the extraction of the free sugars from said pretreated biomass using an alcoholic or aqueous-alcoholic extraction solution (2), so as to obtain a liquid phase enriched in free sugars, called liquor (3), and a solid phase depleted in free sugars, called must (4).

Abstract: The present invention relates to a processing method at acidic or neutral pH in a reactor (4) for processing lignocellulosic biomass (P), said process including a continuous cleaning phase of the reactor which comprises introducing a basic aqueous solution (EB) into said reactor containing the biomass being processed.

Abstract: The invention relates to a process for treating lignocellulosic biomass by means of an acidic liquor in order to produce “second-generation” (2G) sugary liquors. These sugary liquors may be used to produce other products via a biochemical pathway (e.g. alcohols such as ethanol, butanol or other molecules, for example solvents such as acetone, etc.). This process comprises analysis of the liquid streams withdrawn during the process and adjustment of the composition of the impregnation liquor so as to keep the acidic power of said streams constant.

Abstract: The present invention concerns a method for cleaning a reactor (4) for treating a lignocellulosic biomass (P), said method comprising the following steps: a) draining the reactor of the reaction mixture containing the biomass, b) filling the reactor with a basic aqueous solution (EB), c) draining the reactor, d) injecting steam (V) into the reactor, e) filling the reactor with an aqueous solution (E), f) draining the reactor.

Abstract: The present invention relates to a process for treating lignocellulosic biomass, successively comprising b) a step of pretreatment of the biomass placed beforehand under acidic or neutral pH conditions in a pretreatment reactor (3), to produce an acidic or neutral pretreated must (AM), alternating with b?) a step of pretreatment of the biomass placed beforehand under acidic, neutral or basic conditions, with optional sufficient introduction of a basic aqueous solution (EB) into the pretreatment reactor (3) to produce a basic pretreated must (BM), and then c) a step of enzymatic hydrolysis in a hydrolysis reactor (16) of a mixture of the acidic or neutral pretreated must (AM) obtained from step b) with the basic pretreated must (BM) obtained from step b?).

Abstract: The present invention relates to a process for producing cellulolytic and/or hemicellulolytic enzymes with a strain of microorganism belonging to the family of filamentous fungi, said process comprising the following steps: (a) a first step of growing the fungi in an aqueous culture medium, in the presence of at least one carbon-based growth substrate, in a stirred and aerated bioreactor, (b) a second step of producing enzymes, starting with the aqueous culture medium obtained in the first step (a), in the presence of at least one inductive carbon-based substrate, also inducing the production of hydrophobins, and, in a step (d), at least a portion of the hydrophobins produced in step (b) are reintroduced into the growth step (a).

Abstract: The invention concerns a method for treating lignocellulosic biomass, said method comprising the following steps: a, Preparing an impregnation liquor (4) containing a chemical catalyst intended to impregnate the biomass b. Introducing the crushed biomass (6) through an inlet of an impregnation reactor (5), said inlet being situated in a first impregnation area (5a) of said impregnation reactor that comprises two superposed areas, said first impregnation area and a second so-called dewatering area (5b) above the impregnation area c. Introducing the liquor (4a) through a first liquor inlet situated in said first impregnation area (5a) of the reactor, d. Introducing said liquor (4b) into said reactor through a second liquor inlet in another area of the reactor (5d) situated below the biomass inlet in the first impregnation area (5b). The invention also concerns the facility for implementing the method.

Abstract: The invention relates to a process for treating lignocellulosic biomass by means of an acidic liquor in order to produce “second-generation” (2G) sugary liquors. These sugary liquors may be used to produce other products via a biochemical pathway (e.g. alcohols such as ethanol, butanol or other molecules, for example solvents such as acetone, etc.). This process comprises analysis of the liquid streams withdrawn during the process and adjustment of the composition of the impregnation liquor so as to keep the acidic power of said streams constant.

Abstract: The invention relates to a process for treating a lignocellulosic biomass comprising a solids content of not more than 80% by weight, said process comprising the use of at least one reactor (9,14) for treating said biomass, in which the or at least one of said reactors is fed with biomass via a feed means (6,11) creating a pressure increase between the biomass inlet and the biomass outlet of said feed means, in which said feed means is washed by circulation of a washing fluid between a washing inlet (7,12) and a washing outlet (8,13). According to the process, at least a portion of the washing fluid (8,13) exiting the fluid outlet of the at least one feed means (6,11) is reintroduced into the washing inlet of the same feed means or of another of said feed means.

Abstract: A process for producing oligosaccharides from lignocellulosic biomass, having the following steps: a) pre-treating the biomass in a pre-treatment reactor (1) in order to provide an effluent containing a pre-treated substrate; b) enzymatic hydrolysis of the pre-treated substrate contained in the effluent from step a) in a reactor, in the presence of cellulases such that a hydrolysate containing glucose, cellulases and water is produced; c) removing at least a portion of the hydrolysate from step b) comprising a liquid fraction; d) reducing the water content of said portion of the hydrolysate in step c) such that the liquid fraction of the hydrolysate has a water content of less than 65% by weight with respect to the total weight of the liquid fraction; e) incubating the hydrolysate from step d) at a temperature in the range 40° C. to 70° C. for the time necessary to produce an effluent enriched in oligosaccharides.

Abstract: The present invention concerns a process for the production of an aqueous mixture comprising isopropanol, n-butanol and ethanol, comprising a step in which an aqueous solution containing C5 and/or C6 sugars and acetate is fermented under strict anaerobic conditions in the presence of a fermenting microorganism of the genus Clostridium and in which said aqueous solution has an acetate concentration in the range 0.5 to 10 g/L and a ratio by weight of (acetate)/(sum of C5 and/or C6 sugars) in the range 0.005 to 0.35 g/g.

Abstract: The invention relates to a process for treating a lignocellulosic biomass, with: a. Pretreatment of the biomass via at least one cooking or steam explosion operation, so as to obtain a pretreated substrate, b. Liquid/solid separation on at least a portion of the pretreated substrate, comprising two successive substeps: an upstream substep b1 of contacting the solid/liquid mixture performed with a continuous mixer (M) using a mixing fluid, a downstream sub-step b2 of extraction/washing performed with a continuous filter, using a washing fluid, to obtain a solid phase enriched in solid and a plurality of liquid phases enriched in liquid, with at least partial recycling of a liquid phase extracted from the filter at the inlet of the mixer as a mixing fluid.

Abstract: The invention relates to a process for the production of alcohols from biomass that comprises a stage in which at least one aqueous internal flow that comprises at least one alcohol that has n carbon atoms, with n between 2 and 5, is recycled, provided that when the alcohol comprises 2 carbon atoms, it is mixed with at least one other alcohol in such a way as to recover a vapor phase effluent that contains alcohols exiting from said pretreatment reactor.

Abstract: The present invention describes a process for the production of alcohols and/or solvents from a cellulosic or lignocellulosic substrate, comprising at least the following steps: a step A for alkaline pre-treatment of said substrate, comprising a step for heating in the presence of an alkaline chemical reagent and an optional washing step; a step B constituted by a step for adjusting the pH and a step for enzymatic hydrolysis of the pre-treated substrate, at the end of which a hydrolysate is obtained constituted by a liquid phase containing sugars and a solid residue; a step for alcoholic fermentation of the hydrolysate obtained; a step for separation/purification (step C2) at the end of which one or more purified alcohols and/or solvents are obtained; a step for extracting the solid residue; a step D for acid digestion of at least a fraction of the extracted solid residue, at the end of which a portion or all of the product obtained is recycled to step B.

Abstract: Embodiments provided here relate to second generation processes for the production of alcohols or solvents, wherein the lignocellulosic or cellulosic biomass undergoes a pre-treatment before being converted into ethanol after an enzymatic hydrolysis and fermentation. The glucidic polymers of the pre-treated plant material are hydrolysed by cellulases. The alcoholigenic microorganisms used for the ethanolic fermentation principally use hexoses, for example, glucose and mannose. The alcohols of the liquor, with or without separation of the suspended material are extracted by distillation. The stillage, containing pentoses which have not been used, are fermented into an ex-pentose ethanolic liquor and at least a portion of the liquor is recycled upstream of the enzymatic hydrolysis.

Abstract: The present invention concerns a process for the production of an aqueous mixture comprising isopropanol, n-butanol and ethanol, comprising a step in which an aqueous solution containing C5 and/or C6 sugars and acetate is fermented under strict anaerobic conditions in the presence of a fermenting microorganism of the genus Clostridium and in which said aqueous solution has an acetate concentration in the range 0.5 to 10 g/L and a ratio by weight of (acetate)/(sum of C5 and/or C6 sugars) in the range 0.005 to 0.35 g/g.

Abstract: 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 (H1 and 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 (Ex1) to obtain a stream of solid residue (11) comprising lignin and a fermentation wine (12) 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 (16). The liquid stream that is enriched with fermentation products (16) is recycled in the enzymatic hydrolysis stage (H1) to recover any fermentation product and to increase the overall yield of the process.