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Using poly(vinyldodecylimidazolium bromide) for the in-situ product recovery of n-butanol

机译:使用聚(VinyLDodeCylimazolium Bromide)用于原位产物回收正丁醇

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摘要

The mitigation of end-product inhibition during the biosynthesis of n-butanol is demonstrated for an in-situ product recovery (ISPR) system employing a poly(ionic liquid) (PIL) absorbent. The thermodynamic affinity of poly(vinyldodecylimidazolium bromide) [P(VC(12)ImBr)] for n-butanol, acetone and ethanol versus water was measured at conditions experienced in a typical acetone-ethanol-butanol (ABE) fermentation. In addition to providing a high n-butanol partition coefficient (PC = 6.5) and selectivity (alpha(BuOH/water) = 46), P(VC(12)ImBr) is shown to be biocompatible with Saccharomyces cerevisiae and Clostridium acetobutylicum. Furthermore, the diffusivity of n-butanol in a hydrated PIL provides absorption rates that support ISPR applications. Using a 5 wt% PIL phase fraction relative to the aqueous phase mass, P(VC(12)ImBr) improved the volumetric productivity of a batch ABE ISPR process by 31% relative to a control fermentation. The concentration of n-butanol in the P(VC(12)ImBr) phase was sufficient to increase the alcohol concentration from 1.5 wt% in the fermentation medium to 25 wt% in the saturated PIL, thereby facilitating downstream n-butanol recovery.
机译:在使用聚(离子液体)(Pil)吸收剂的原位产物回收(ISPR)系统的原位产物回收(ISPR)系统中,证明了在正丁醇的生物合成期间减缓了终产物抑制。在典型的丙酮 - 乙醇 - 丁醇(ABE)发酵中的条件下测量N-丁醇,丙酮和乙醇与水的热(VININDODECALIMIDAIMIDOLIUM溴化胺)的热力学亲和力。除了提供高正丁醇分配系数(PC = 6.5)和选择性(α(α-水)= 46)外,P(Vc(12)IMBr)显示为生物相容的酿酒酵母和乙酰丁基丁基。此外,水合渣中的正丁醇的扩散性提供支持ISPR应用的吸收率。使用相对于水相质量的5wt%的pil相级分,P(Vc(12)IMBR)相对于对照发酵将Buck ABE ISPR加工的体积生产率提高了31%。 P(VC(12)IMBR)相中正丁醇的浓度足以将在发酵培养基中的1.5wt%的醇浓度从饱和的p1中的25wt%增加至25wt%,从而促进正丁醇回收下游。

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