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US 2011/0162954A1 Jul.7,2011 RECOVERY OF BUTANOL FROM A MIXTURE OF BUTANOL, WATER, AND AN ORGANIC EXTRACTANT CROSS REFERENCE TO RELATED APPLICATIONS [0001] Thisapplicationclaimsthebene?tofpriorityto US. ProvisionalPatentApplication61/225,662,?ledJul.15, 2009, the entirety of Which is herein incorporated by refer ence. FIELD OF THE INVENTION [0002] Processesforrecoveringbutanolfromabutanol containingorganicphaseobtainedfromanextractivefermen tation process are provided. Speci?cally, processes for sepa rating butanol from a mixture comprising butanol, Water, a Water-immiscible organic extractant, and optionally a non condensable gas, are provided. [0013] intoa?rstdistillationcolumn,Whereinthe?rst distillation column comprises a stripping section and optionallyarectifyingsectionatanintroductionpoint abovethestrippingsection,the?rstdistillationcolumn having an operating temperature, T1 and an operating pressure Pl at a predetermined point in the stripping section, Wherein T 1 and P1 are selected to produce a ?rst bottoms stream and a ?rst vaporous overhead stream, the ?rst bottoms stream comprising the Water-immiscible organicextractantandWaterandbeingsubstantiallyfree ofbutanol, and the ?rstvaporous overhead stream com prising Water, butanol, and the optional non-condens ablegas; [0014] b)condensingthe?rstvaporousoverheadstream to produce a gas phase and recover a ?rst mixed conden sate, Wherein the ?rst mixed condensate comprises [0015] (i)abutanolphasecomprisingbutanol,less thanabout30Wt% Water;and [0016] (i)anaqueousphasecomprisingWaterand BACKGROUNDOFTHEINVENTION lessthanabout10Wt%ofbutanol; [0003] ButanolisanimportantindustrialchemicalWitha variety of applications, such as use as a fuel additive, as a blendcomponenttodieselfuel,asafeedstockchemicalinthe plasticsindustry,andasafoodgradeextractantinthefoodand ?avor industry. Each year 10 to 12 billion pounds of butanol are produced by petrochemical means. As the projected demand for butanol increases, interest in producing butanol from reneWable resources such as corn, sugar cane, or cellu losicfeedsbyfermentationisexpanding. [0004] Inafermentativeprocesstoproducebutanol,insitu product removal advantageously reduces butanol inhibition of the microorganism and improves fermentation rates by controllingbutanolconcentrationsinthefermentationbroth. Technologies for in situ product removal include stripping, adsorption,pervaporation,membranesolventextraction,and liquid-liquidextraction.Inliquid-liquidextraction,anextrac tant is contacted With the fermentation broth to partition the butanol betWeen the fermentation broth and the extractant phase. The butanol and the extractant are recovered by a separation process, for example by distillation. In the recov eryprocess,thebutanolcanalsobeseparatedfromanyWater, non-condensablegas,and/orfermentationby-productsWhich may havebeenremovedfromthefermentationbroththrough use of the extractant. [0005] Processesforrecoveringbutanolfromthebutanol containing extractant phase obtained by in situ product removal from a fermentation broth are sought. Economical processes for recovering butanol substantially free of Water and of the extractant are desired. Also desired are separation processes Which minimiZe degradation ofthe extractant. SUMMARY OF THE INVENTION [0006] Thepresentinventionprovidesaprocessforsepa rating a butanol selected from the group consisting of l-bu tanol,isobutanol,andmixturesthereof,fromafeedcompris ingaWater-immiscibleorganicextractant,Water,thebutanol, and optionally a non-condensable gas. [0007] Inoneaspect,thepresentinventionisaprocess comprisingthesteps: [0008] a)introducingafeedcomprising: [0009] (i)aWater-immiscibleorganicextractant, [0010] (i)Water, [0011] (i)atleastoneisomerofbutanol,and [0012] (iv)optionallyanon-condensablegas [0017] c)introducingatleastaportionoftheaqueous phasetothe?rstdistillationcolumn; [0018] d)introducinga?rstportionofthebutanolphase into a second distillation column having at least a strip pingsection;and [0019] e)operatingtheseconddistillationcolumntopro duce a second bottoms stream comprising butanol and beingsubstantiallyfreeofWater,andasecondvaporous overheadstreamcomprisingbutanolandWater; Wherein the extractant is selected such that it (A) preferen tially dissolves butanol over Water and (B) is separable from butanol by distillation. BRIEF DESCRIPTION OF THE FIGURES [0020] FIG.1illustratesoneembodimentofasystemuse fulforpracticingtheprocessoftheinvention. [0021] FIG.2illustratesaprocessschematicdiagramused in modeling the process of the invention. DETAILED DESCRIPTION OF THE INVENTION [0022] Applicantsspeci?callyincorporatetheentirecon tents of all cited references in this disclosure. Further, When anamount, concentration,orothervalueorparameterisgiven as either a range, preferred range, or a list of upper preferable valuesandloWerpreferablevalues,thisistobeunderstoodas speci?callydisclosingalrangesformedfromanypairofany upperrangelimitorpreferredvalueandanyloWerrangelimit or preferred value, regardless of Whether ranges are sepa ratelydisclosed.Where arangeofnumericalvaluesisrecited herein, unless otherWise stated, the range is intended to includetheendpointsthereof,andalintegersandfractions Within the range. It is not intended that the scope of the inventionbe limitedtothe speci?c values recitedWhen de?n ing a range. De?nitions [0023] ThefolloWingde?nitionsareusedinthisdisclosure: [0024] “Butanol”asusedhereinrefersWithspeci?cityto thebutanolisomersl-butanol(l-BuOH)and/orisobutanol (iBuOH or I-BUOH), either individually or as mixtures thereof.2-Butanolandtert-butanol(1,1-dimethylethanol) arespeci?callyexcludedfromthepresentinvention.PDF Image | RECOVERY OFBUTANOL FROM A MIXTURE OF BUTANOL 2011
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