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33 d)introducingatleastaportionoftheaqueousphasetothe ?rstdistillationcolumn; e) introducing a ?rst portion of the organic phase into a second distillation column having at least a stripping section;and f) operating the second distillation column to produce a second bottoms stream comprising butanol and ethanol and Wherein said bottoms stream is substantially free of Water and entrainer, and a second vaporous overhead stream comprising butanol, ethanol, entrainer, and Water. 2.Theprocessofclaim1,Whereintheextractantisselected suchthatit(A)preferentiallyextractsbutanoloverWaterand (B)isseparablefrombutanolbydistillation;andtheentrainer is selected such that it (C) has a higher vapor pressure than butanoland(D)isseparablefrombutanolbydistillation. 3. The process of claim 1, further comprising any one of steps: g)introducingasecondportionoftheorganicphaseinto20 the ?rst distillation column; or h)condensingthevaporousoverheadstreamfromthesec ond distillation column to recover a second condensate stream, and introducing at least a portion of the second condensate stream into the ?rst mixed condensate; or j)bothstepsg)andsteph). 4. The process of claim 1, Wherein the process stream or 34 gas phase to recover at least a portion of the entrainer and optionally introducing the recovered entrainer to the ?rst mixed condensate. 10.Theprocessofclaim9,Whereinanon-condensablegas is present in the feed, the gas phase further comprises the non-condensablegas,andtheprocessfurthercomprisespurg ing at least a portion of the gas phase comprising the non condensable gas from the process. 11. The process of claim 1, Wherein the non-condensable gas comprises carbon dioxide, nitrogen, hydrogen, noble gases, or mixtures. 12. The process of claim 1, Wherein the feed comprises an organic phase obtained from an extractive fermentation. 13. The process of claim 1, Wherein the butanol concentra tion in the feed is from about 0.1 Weight percent to about 40 Weightpercent,basedontheWeightofthefeed. 14.Theprocessofclaim1,Whereintheentrainercomprises at least one hydrocarbon. 15. The process of claim 14, Wherein said at least one hydrocarbon selected from the group consisting of pentane, hexane,hexene,cyclohexane,benZene,toluene,andxylene. 16. The process of claim 1, Wherein the extractant com prises at least one solvent selected from the group consisting ofC7toC22fattyalcohols,C7toC22fattyacids,estersofC7 toC22fattyacids,C7toC22fattyaldehydes,C7toC22fatty amides,andmixturesthereof. 17. The process of claim 16, Wherein the extractant com prises at least one solvent selected from the group consisting ofC12toC22fattyalcohols,Cl2toC22fattyacids,estersof C12toC22fattyacids,Cl2toC22fattyaldehydes,Cl2toC22 fattyamides,andmixturesthereof. 18. The process of claim 1, Wherein the isomer of butanol isl-butanol,2-butanol,isobutanol,ormixturesthereof. 19. The process of claim 1, Wherein the isomer of butanol isisobutanol. 20. The process of claim 1 Wherein the butanol in the feed introduced into a ?rst distillation column is produced by fermentation of corn or sugar cane. 21. The process of claim 1 Wherein there is a process to processheatexchangebetWeenthefeedintroducedtothe?rst distillationcolumnandthe?rstbottomsstream. 22. The process of claim 1, Wherein the fermentation by productscompriseorganicacids. 23. The process of claim 1, Wherein the fermentation by productscomprisevolatilefermentationby-products. 24. The process of claim 23, Wherein the second vaporous overhead stream comprises the volatile fermentation by-products. 25. The process of claim 24, Wherein at least a portion of the second vaporous overhead stream ispurged to remove the volatilefermentationby-products. 26. The process of claim 1, Wherein the feed is obtained from a fermentation vessel or an extractor. ***** vessel of step (b) is selected from the feed stream, the ?rst vaporousoverheadstream,the?rstmixedcondensatestream, thesecondcondensatestream,theportionoftheorganic30 phaseWhichisintroducedintothesecondcolumn,thevapor ous overhead stream from the second distillationcolumn, the ?rstdistillationcolumn,thedecanter,theuppersectionofthe second distillation column, and combinations thereof. 5.Theprocessofclaim1,furthercomprisingthestepof 35 introducing Water, steam, or a mixture thereof into the ?rst distillationcolumn. 6. The process of claim 1, further comprising the step of introducing at least a portion of the aqueous phase into a fermentationvessel. 7. The process of claim 1, Wherein the process further comprisesthestepofintroducingthebottomsstreamfromthe ?rst distillation column into a fermentation vessel. 40 8. The process of claim 1, Wherein the process further comprisesseparatingthebottomsstreamfromthe?rstdistil 45 lation column to obtain a bottoms aqueous phase comprising Waterandabottomsorganicphasecomprisingtheextractant, introducing at least a portion of the bottoms organic phase intoafermentationvessel,andoptionallyintroducingatleast aportionofthebottomsaqueousphaseintoafermentation 50 vessel. 9.Theprocessofclaim1,Whereinthegasphasecomprises entrainer, and the process further comprises condensing the US 8,563,788B2 25PDF Image | RECOVERY OF BUTANOL
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