2,3-Butanediol recovery from fermentation broth by alcohol precipitation and vacuum distillation

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• 作者：Sangjun Jeon¹ ; ^&Dagger ; ; Duk-Ki Kim¹ ; ³ ; ^&Dagger ; ; Hyohak Song¹ ; ^{hyohaks@gscaltex.com" class="auth_mail} ; Hee Jong Lee¹ ; Sunghoon Park² ; Doyoung Seung¹ ; Yong Keun Chang³
• 关键词：2 ; 3-Butanediol ; Fermentation ; Klebsiella pneumoniae ; Recovery ; Alcohol precipitation
• 刊名：Journal of Bioscience and Bioengineering
• 出版年：April, 2014
• 年：2014
• 卷：117
• 期：4
• 页码：464-470
• 全文大小：1341 K

文摘

This study presents a new and effective downstream process to recover 2,3-butanediol (2,3-BD) from fermentation broth which is produced by a recombinant Klebsiella pneumoniae strain. The ldhA-deficient K. pneumoniae strain yielded about 90聽g/L of 2,3-BD, along with a number of by-products, such as organic acids and alcohols, in a 65聽h fed-batch fermentation. The pH-adjusted cell-free fermentation broth was firstly concentrated until 2,3-BD reached around 500聽g/L by vacuum evaporation at 50掳C and 50聽mbar vacuum pressure. The concentrated solution was further treated using light alcohols, including methanol, ethanol, and isopropanol, for the precipitation of organic acids and inorganic salts. Isopropanol showed the highest removal efficiency, in which 92.5% and 99.8% of organic acids and inorganic salts were precipitated, respectively. At a final step, a vacuum distillation process enabled the recovery of 76.2% of the treated 2,3-BD, with 96.1% purity, indicating that fermentatively produced 2,3-BD is effectively recovered by a simple alcohol precipitation and vacuum distillation.