Low energy intensity production of fuel-grade bio-butanol enabled by membrane-based extraction
Low energy intensity production of fuel-grade bio-butanol enabled by membrane-based extraction
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DOI：
10.1039/d0ee02927k
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发表时间：
2020-12-01
影响因子：
32.5
通讯作者：
Livingston, Andrew G.
中科院分区：
文献类型：
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作者：
Kim, Ji Hoon;Cook, Marcus;Livingston, Andrew G.
从水发酵系统中回收燃料产品的巨大能源负担抑制了生物燃料的广泛使用。在这里，我们描述了一种基于膜的提取（萃取）系统，用于从发酵液中回收燃料级生物丁醇，该系统可以以高纯度（99.5%）提取正丁醇，而使用的能量不到当前技术选择的25%。这是通过结合喷雾涂层薄膜复合膜与2-乙基-1-己醇作为萃取剂来实现的。该膜成功地保护了微生物免受萃取剂的侵害，萃取剂虽然在其他方面是理想的，但它是一种代谢抑制剂。与水相比，萃取剂不会与正丁醇形成异相共沸物，生产正丁醇的总能耗为3.9 MJ kg(-1)，大大低于其他回收工艺（17.0-29.4 MJ kg(-1)）。通过(a)在无相变的情况下从发酵液中提取正丁醇，(b)打破非均相共沸关系（较少的蒸馏能耗），以及(c)利用小体积比的萃取剂与发酵液（1:10 0,v/v），避免了高能量强度过程的需要，如渗透蒸发、气提或液-液萃取。探索了该抽提系统在一系列高级醇的连续生产中的应用，并证明了它是非常有利的。
Widespread use of biofuels is inhibited by the significant energy burden of recovering fuel products from aqueous fermentation systems. Here, we describe a membrane-based extraction (perstraction) system for the recovery of fuel-grade biobutanol from fermentation broths which can extract n-butanol with high purity (> 99.5%) while using less than 25% of the energy of current technology options. This is achieved by combining a spray-coated thin-film composite membrane with 2-ethyl-1-hexanol as an extractant. The membrane successfully protects the micro-organisms from the extractant, which, although ideal in other respects, is a metabolic inhibitor. In contrast to water, the extractant does not form a heterogeneous azeotrope with n-butanol, and the overall energy consumption of for n-butanol production is 3.9 MJ kg(-1), substantially less than other recovery processes (17.0-29.4 MJ kg(-1)). By (a) extracting n-butanol from the fermentation broth without a phase change, (b) breaking the heterogeneous azeotrope relationship (less energy consumption for distillation), and (c) utilizing a small volume ratio of extractant : fermentation broth (1 : 100, v/v), the need for high energy intensity processes such as pervaporation, gas stripping or liquid-liquid extraction is avoided. The application of this perstraction system to continuous production of a range of higher alcohols is explored and shown to be highly favourable.