NOVELTY - Producing butanol, involves introducing an aqueous mixture into a fermenter, fermenting the aqueous mixture to obtain a first fermentation broth, where the fermentation broth comprises a microorganism for producing butanol, and carbohydrates from the non-cellulosic biomass and butanol, and partially extracting the butanol from the first fermentation broth using a first solvent extractant by first liquid-liquid extraction through first porous membrane to obtain first extract and second fermentation broth.    USE - The method is useful for producing butanol, preferably 1-butanol or isobutanol (claimed). The butanol is useful as building block chemical and potential transportation fuel.    ADVANTAGE - The method provides increased rate and/or yield of butanol, and lowers overall energy consumption in separation of ethanol when compared to existing distillation.    DETAILED DESCRIPTION - Method for producing butanol, involves introducing an aqueous mixture into a fermenter, where the aqueous mixture comprises carbohydrates obtained from non-cellulosic biomass, fermenting the aqueous mixture to obtain a first fermentation broth, where the fermentation broth comprises a microorganism for producing butanol, and carbohydrates from the non-cellulosic biomass and butanol, and partially extracting the butanol from the first fermentation broth using a first solvent extractant by first liquid-liquid extraction through first porous membrane to obtain a first extract and a second fermentation broth. The first solvent extractant comprises a 7-12C straight-chain or branched alcohol. The second fermentation broth has lower concentration of butanol than the first fermentation broth. The first liquid-liquid extraction is carried out in a liquid-liquid extraction element comprising several first layer pairs and several second layer pairs, where each first layer pair comprises a first polymeric microporous membrane and a first flow channel layer oriented in first flow direction having first fluid inlet and first fluid outlet disposed on first opposing sides of the liquid-liquid extraction element. The second layer pair is disposed between two first layer pairs and at least one first layer pair which is disposed between two second layer pairs to form a stack of layers. The second layer pair comprises a second polymeric microporous membrane, and second flow channel layer oriented in a second flow direction different than the first flow direction and having a second fluid inlet and a second fluid outlet disposed on second opposing sides of the extraction element. An INDEPENDENT CLAIM is included for method of recovering butanol from a fermentation broth, which involves performing the above-mentioned method.