Low energy intensity production of fuel-grade bio-butanol enabled by membrane-based extraction,Energy & Environmental Science

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Low energy intensity production of fuel-grade bio-butanol enabled by membrane-based extraction
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-10-24 , DOI: 10.1039/d0ee02927k
Ji Hoon Kim _{1,

2,

3,

4,

5} , Marcus Cook _{1,

2,

3,

4,

5} , Ludmila Peeva _{1,

2,

3,

4,

5} , Jet Yeo _{1,

2,

3,

4,

5} , Leslie W. Bolton _{5,

6,

7} , Young Moo Lee _{8,

9,

10,

11} , Andrew G. Livingston _{1,

2,

3,

4,

5}

Affiliation

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.

中文翻译：

基于膜的萃取可实现低能耗的燃料级生物丁醇生产

从含水发酵系统回收燃料产品的巨大能源负担阻碍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（吸附）系统，用于从发酵液中回收燃料级生物丁醇，该系统可以提取高纯度（> 99.5％）的正丁醇，而消耗的能量不到当前技术的25％选项。这是通过将喷涂复合薄膜复合膜与2-乙基-1-己醇作为萃取剂结合而实现的。膜成功地保护了微生物免受萃取剂的侵害，尽管在其他方面是理想的，但它还是一种代谢抑制剂。与水相反，萃取剂不会与正丁醇形成异质共沸物，而总能量消耗为正丁醇的产量为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）从发酵液中提取正丁醇而不发生相变，（b）打破非均相共沸关系（蒸馏所需的能耗更少），（c）利用小体积比的萃取剂：发酵液（1： 100，v / v），避免了对高能量强度过程的需要，例如全蒸发，气提或液-液萃取。探索了这种分散系统在连续生产一系列高级醇中的应用，并证明是非常有利的。

更新日期：2020-11-03

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