TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The improved biomass processing productivity is improved fermentative product and co-product recoverability relative to the obtained fermentative product in the presence of undissolved solids. The improved biomass processing productivity comprises one or more of increased process stream recyclability, increased fermentor volume efficiency, and increased biomass feedstock load feeding. The method (M1) involves contacting the fermentation broth with an extractant, where the extractant has increased extraction efficiency relative to the fermentation broth. The increased extraction efficiency comprises one or more of stabilized partition coefficient of the extractant, enhanced phase separation of the extractant from the fermentation broth, enhanced liquid-liquid mass transfer coefficient, increased extractant recovery and recyclability, and preserved extractant for recovery and recycle. The method (M1) involves liquefying a feedstock to obtain biomass feedstock slurry, where the feedstock is chosen from corn grain, corn cobs, crop residues including corn husks, corn stover, grasses, corn, wheat, rye, wheat straw, barley, barley straw, hay, rice straw, switchgrass, waste paper, sugarcane bagasse, Sorghum, sugarcane, soy, and components obtained from milling of grains, cellulosic material, lignocellulosic material, trees, branches, roots, leaves, wood chips, sawdust, shrubs and bushes, vegetables, fruits, flowers, animal manure, and their mixtures, preferably corn. The method (M1) and (M2) further involves increasing the reaction temperature during liquefaction. The method (M1) involves at least partially vaporizing the fermentation broth and product and optionally carbon dioxide, where a vapor stream is produced and recovers the product from the vapor stream. The method (M1) further involves contacting the vapor stream with an absorption liquid phase, where at least portion of the vapor stream is absorbed into the absorption liquid phase, and temperature of the onset of the absorption of the vapor stream into the absorption liquid phase is greater than the temperature of the onset of condensation of the vapor stream in the absence of the absorption liquid phase. The vaporizing and contacting steps of method (M1) are carried out under vacuum conditions. The method (M1) involves separating a substantial portion of the undissolved solids from the slurry provides for higher vapor pressure of the fermentation broth relative to the fermentation broth. The higher vapor pressure provides for more efficient vaporization product recovery. The more efficient vaporization product recovery involves using one or more of lower capital investment, smaller vaporization, absorption, compression, and refrigeration equipment, improved mass transfer rates, less energy for vaporization, and lower absorbent flow rate. The method (M2) involves dry milling the feedstock. The method (M2) involves separating and removing undissolved solids from the feedstock slurry by centrifuging the feedstock slurry. The centrifugation of method (M2) involves separating the feedstock slurry into a first liquid phase comprising the aqueous solution, a solid phase comprising the wet cake, and a second liquid phase comprising the oil. The method (M2) involves performing in situ removal by liquid-liquid extraction using organic extractant. The method (M2) involves saccharifying the oligosaccharides in the aqueous solution occur simultaneously with or before fermentation of oligosaccharides in the fermentor. The centrifugation is performed before saccharification of the sugar. The method (M2) involves removing undissolved solids from the feedstock slurry for (a) increasing efficiency of the butanol production by increasing liquid-liquid mass transfer coefficient of the butanol from the fermentation broth to the extractant, (b) increasing the efficiency of the butanol production by increasing extraction efficiency of the butanol with extractant, (c) increasing the efficiency of the butanol production by increasing a rate of phase separation between the fermentation broth and extractant, (d) increasing the efficiency of the butanol production by increasing recovery and recycling of extractant, or (e) increasing the efficiency of the butanol production by decreasing flow rate of extractant. Preferred Components: The feedstock is fractionated or unfractionated. The feedstock is wet-milled or dry-milled. The feedstock slurry comprises oil from the feedstock and the oil is separated from the slurry. The wet cake comprises feedstock oil. The wet cake is washed with water to recover oligosaccharides present in the wet cake. The recovered oligosaccharides are added to the fermentation vessel. The wet cake is further processed to provide an improved co-product. The co-product is further processed to obtain an animal feed product. The wet cake is washed with solvent to recover oil present in the wet cake. Preferred System: The system further comprises a saccharification vessel configured to saccharify the sugar in the feedstock slurry or aqueous solution, where the saccharification vessel comprises inlet for receiving the feedstock slurry or aqueous solution, and outlet for discharging the feedstock slurry or aqueous solution. The system further comprises a dry mill configured to pulverize the feedstock, where the dry mill comprises inlet for receiving the feedstock, and outlet for discharging ground feedstock. Preferred Component: The centrifuge further comprises a third outlet for discharging oil created while removing the undissolved solids from the feedstock slurry.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The extractant is an organic extractant. The extractant comprises one or more immiscible organic extractants chosen from 12-22C fatty alcohols, 12-22C fatty acids, esters of 12-22C fatty acids, 12-22C fatty aldehydes, 12-22C fatty amides and their mixtures, preferably 12-22C fatty acids derived from corn oil. The undissolved solids are separated from feedstock slurry by decanter bowl centrifuge, tricanter centrifuge, disk stack centrifuge, filtering centrifuge, decanter centrifuge, belt filter, hydrocyclone, filter press, screw press, gravity settler or vortex separator, or by filtration, vacuum filtration, pressure filtration, filtration using screen, screen separation, grating, porous grating, flotation or their combinations. The solvent is chosen from hexane, butanol, isobutanol, isohexane, ethanol, and petroleum distillates. The recombinant microorganism comprises an engineered butanol biosynthetic pathway. The undissolved solids comprise germ, fiber, and gluten. The corn is unfractionated. EXAMPLE - No suitable example given.