NOVELTY - Method (M1) for producing butyl esters, involves contacting butanol produced in fermentation process with at least one carboxylic acid and at least one catalyst capable of esterifying the carboxylic acid with the butanol to form butyl esters of the carboxylic acid, where the carboxylic acid in the fermentation process is present at concentration sufficient to produce two-phase mixture.    USE - The method is useful for producing butyl esters and butanol from feedstocks (claimed), where the butanol is used in beverage, fuel, reagents and solvents, and as renewable fuel additive, raw material in plastic industries and food grade extractant in food industries.    ADVANTAGE - The method produces butanol in large quantities and is environmentally-friendly.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method (M2)for producing butanol and butyl esters from a feedstock, involves (a) providing a feedstock, (b) liquefying the feedstock to create a liquefied biomass comprising oligosaccharides, (c) separating the feedstock slurry to produce stream or a product comprising an aqueous stream comprising oligosaccharides, oil stream and solids, (d) adding the aqueous stream to fermentation vessel containing fermentation broth, (e) saccharifying the oligosaccharides of the aqueous stream, (f) fermenting the products of the saccharified oligosaccharide present in the aqueous stream to produce butanol and concurrently contacting the butanol with at least one carboxylic acid and at least one catalyst capable of esterifying the carboxylic acid with the butanol to form butyl esters of the carboxylic acid wherein the carboxylic acid is present at a concentration sufficient to produce a two-phase mixture, and optionally (g) separating the butyl ester-containing organic phase from the aqueous phase, and (h) recovering butanol from the butyl esters and repeating steps (e) and (f) concurrently;    (2) method for producing butanol, involves (a) contacting butanol with the above mentioned compounds to produce two-phase mixture comprising an aqueous phase and butyl ester-containing organic phase, (b) separating the butyl ester-containing organic phase from the aqueous phase, and (c) recovering butanol from the butyl esters;    (3) method for producing butanol from feedstock, involves performing the above-mentioned processes of method (M2);    (4) fermentation broth comprising (a) recombinant microorganism capable of producing a product alcohol, (b) fermentable carbon substrate, (c) catalyst capable of extracellularly esterifying fatty acids with the product alcohol into fatty acid alcohol esters, and (d) fatty acid alcohol esters, where the fatty acid alcohol esters are produced during the fermentation; and    (5) fermentation composition comprising (a) fermentable carbon substrate, (b) catalyst capable of esterifying free fatty acids with an alcohol into fatty acid alkyl esters and optionally capable of hydrolyzing glycerides into free fatty acids, (c) alcohol, (d) free fatty acids, and (e) fatty acid alcohol esters formed in situ from esterification of the free fatty acids with the alcohol using the catalyst.