Abstract: The present invention relates to a process for producing alcohols comprising: a. an IBE-type fermentation step in at least one bioreactor (R1) in the presence of a natural strain microorganism, and fed at least with an aqueous solution (1) of C5 and/or C6 sugars and a recycled acetone stream (3), in order to produce fermentation gases and a fermentation broth containing fermentation products; b. a step of recovering the fermentation products, in order to obtain a stream of fermentation products (2); c. a step of treating the stream of fermentation products comprising an acetone separation section in order to produce at least an acetone effluent (3) and an aqueous alcohol effluent (4); d. a step for recycling at least a fraction of the acetone effluent (3) from step c) to step a).

Abstract: The present invention relates to a process for producing alcohols comprising: a. an IBE-type fermentation step in at least one bioreactor (R1) in the presence of a natural strain microorganism, and fed at least with an aqueous solution (1) of C5 and/or C6 sugars and a recycled acetone stream (3), in order to produce fermentation gases and a fermentation broth containing fermentation products; b. a step of recovering the fermentation products, in order to obtain a stream of fermentation products (2); c. a step of treating the stream of fermentation products comprising an acetone separation section in order to produce at least an acetone effluent (3) and an aqueous alcohol effluent (4); d. a step for recycling at least a fraction of the acetone effluent (3) from step c) to step a).

Abstract: The present invention relates to a process for producing alcohols, in which a sugary fluid is introduced into a fermentation reactor (2) to produce a fermentation must enriched in isopropanol, butanol, ethanol and acetone relative to the sugary fluid, the fermentation reactor (2) comprising a biomass produced by a strain belonging to the genus Clostridium which is supported on a solid support (9) comprising a polyurethane foam; and to a fermentation reactor (2) comprising said biomass supported on said solid support (9).

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: This invention describes a process for the production of second generation alcohols and/or solvents starting from cellulosic or lignocellulosic biomass wherein the lignocellulosic or cellulosic biomass undergoes a pretreatment before being converted into ethanol after an enzymatic hydrolysis and an ethylic fermentation, wherein glucidic polymers of the pretreated plant are hydrolyzed by cellulases; microorganisms that primarily use hexoses and preferably glucose and mannose are used for the ethylic fermentation; wines, with or without separation of materials in suspension are extracted by distillation; pentoses in the vinasses are fermented by a solventogenic microorganism into a butyl wine, and at least one portion of the butyl wine is recycled upstream from enzymatic hydrolysis.

Abstract: The present invention describes a process for the production of alcohol, known as second generation production, from a lignocellulosic substrate, in which a controlled quantity of furfural is produced in situ and which comprises at least the following steps: a first step for alkaline chemical pre-treatment of the substrate; a step for adjusting the pH of the substrate; then a step for enzymatic hydrolysis of said pre-treated substrate; a step for alcoholic fermentation of the hydrolysate obtained with an alcohol-producing microorganism; a step for separation/purification; and a step for acid conversion of at least one liquid fraction into furfural, said liquid fraction being obtained during one of the preceding steps; a step for mixing said furfural obtained with the pre-treated substrate during the pH adjusting step.

Abstract: This invention describes a process for the production of alcohols and/or solvents from cellulosic or lignocellulosic biomass that comprises at least the following stages: a) Alkaline chemical pretreatment of a cellulosic or lignocellulosic substrate; b) Optionally washing of the pretreated substrate; c) Enzymatic hydrolysis of the substrate that is pretreated and optionally washed using cellulolytic and/or hemicellulolytic enzymes that produce a hydrolyzate and a water-insoluble residue; d) Microorganism fermentation of the hydrolyzate that is obtained from stage c) and production of a fermentation must that contains at least one alcohol and/or solvent; e) Separation/purification of alcohol and/or solvent, and f) Separation of a cake that contains the insoluble residue, in which at least a portion of the cake that is obtained in stage f) is sent into at least one reactor for regeneration of cellulose, before being recycled downstream from stage a) for alkaline chemical pretreatment.

Abstract: The present invention describes a process for production of alcohols and/or solvents from a cellulosic or lignocellulosic biomass, comprising: a step for thermochemical pre-treatment of a cellulosic or lignocellulosic substrate; an optional step for washing the pre-treated substrate and adjusting the pH; a step for enzymatic hydrolysis of the pre-treated substrate; a step for ethanolic fermentation of the hexoses contained in the hydrolysate obtained from step (c) into ethanol by a hexose-fermenting microorganism and for obtaining an ex-hexose ethanolic liquor; an extraction step; a step for ethanolic fermentation of the pentoses contained in at least one of the streams obtained from one of the preceding steps with a pentose-fermenting microorganism and for obtaining an ex-pentose ethanolic liquor; in which at least a portion of the ex-pentose ethanolic liquor is recycled upstream of at least one of the enzymatic hydrolysis and/or ethanolic fermentation steps.

Abstract: A process for the production of alcohols and/or solvents starting from cellulosic or lignocellulosic biomass comprising at least: a) Thermochemical pretreatment of a cellulosic or lignocellulosic substrate; b) Optionally, washing pretreated substrate and setting the pH; c) Enzymatic hydrolysis of pretreated, optionally washed, substrate, using cellulolytic and/or hemicellulolytic enzymes producing a hydrolyzate and a water-insoluble residue; d) Ethylic fermentation of hexoses in hydrolyzate obtained from c) into ethanol by alcohologenic microorganism and production of ethyl wine; e) One extraction stage comprising e1) Separation and purification of ethanol and/or solvents obtained from d), and e2) Separation of a solid cake containing insoluble residue and production of vinasses; f) Butylic fermentation of pentoses contained in vinasses obtained in e2) by a solventogenic microorganism and production of butyl wine; at least a portion of butyl wine is recycled upstream from at least one enzymatic hydrolys

Abstract: This invention describes a process for the production of alcohols and/or solvents from cellulosic or lignocellulosic biomass that comprises at least the following stages: a) Alkaline chemical pretreatment of a cellulosic or lignocellulosic substrate; b) Optionally washing of the pretreated substrate; c) Enzymatic hydrolysis of the substrate that is pretreated and optionally washed using cellulolytic and/or hemicellulolytic enzymes that produce a hydrolyzate and a water-insoluble residue; d) Microorganism fermentation of the hydrolyzate that is obtained from stage c) and production of a fermentation must that contains at least one alcohol and/or solvent; e) Separation/purification of alcohol and/or solvent, and f) Separation of a cake that contains the insoluble residue, in which at least a portion of the cake that is obtained in stage f) is sent into at least one reactor for regeneration of cellulose, before being recycled downstream from stage a) for alkaline chemical pretreatment.

Abstract: The present invention describes a process for the production of alcohol, known as second generation production, from a lignocellulosic substrate, in which a controlled quantity of furfural is produced in situ and which comprises at least the following steps: a first step for alkaline chemical pre-treatment of the substrate; a step for adjusting the pH of the substrate; then a step for enzymatic hydrolysis of said pre-treated substrate; a step for alcoholic fermentation of the hydrolysate obtained with an alcohol-producing microorganism; a step for separation/purification; and a step for acid conversion of at least one liquid fraction into furfural, said liquid fraction being obtained during one of the preceding steps; a step for mixing said furfural obtained with the pre-treated substrate during the pH adjusting step.