TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The genetically modified microorganism is bacteria, cyanobacteria, filamentous fungi or yeasts, where the: bacteria is Zymomonas, Escherichia, Salmonella, Rhodococcus, Pseudomonas, Bacillus, Lactobacillus, Enterococcus, Pediococcus, Alcaligenes, Klebsiella, Paenibacillus, Arthrobacter, Corynebacterium or Brevibacterium; and yeast is Pichia, Candida, Hansenula, Kluyveromyces, Issatchenkia or Saccharomyces.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electrolyte comprises a salt having: a cation including lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, ammonium and/or phosphonium; and an anion including sulfate, carbonate, acetate, citrate, lactate, phosphate, fluoride, chloride, bromide and/or iodide. The electrolyte is sodium sulfate and/or sodium chloride.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: In the method (I), a portion of the butanol is concurrently removed from the fermentation medium by a process comprising: stripping butanol from the fermentation medium with a gas to form a butanol-containing gas phase; and recovering butanol from the butanol-containing gas phase. The electrolyte is added to the fermentation medium, to the first extractant and/or to the optional second extractant, where the: first extractant is oleyl alcohol (preferred), behenyl alcohol, cetyl alcohol, lauryl alcohol, myristyl alcohol, stearyl alcohol, oleic acid, lauric acid, myristic acid, stearic acid, methyl myristate, methyl oleate, lauric aldehyde and/or 1-dodecanol; and the second extractant is 1-nonanol, 1-decanol, 1-undecanol, 2-undecanol and/or 1-nonanal. The fermentation medium further comprises ethanol and the butanol-containing organic phase contains ethanol. In method (II), the electrolyte is added to: the aqueous phase during the growth phase of the microorganism; the aqueous phase during the butanol production phase; and the aqueous phase when the butanol concentration in the aqueous phase is inhibitory to the first extractant and/or the optional second extractant. The electrolyte is obtained from a fermentation medium. In the method (III), the electrolyte is added to the fermentation medium in step (c3): when the microorganism growth phase slows; and when the butanol production phase is complete. In the methods (I)-(III), the fermentable carbon source is present in the fermentation medium and comprises renewable carbon from agricultural feedstocks, algae, cellulose, hemicellulose and/or lignocellulose. EXAMPLE - No suitable example given.