丁醇
Pervaporative butanol removal from PBE fermentation broths for the bioconversion of glycerol by Clostridium pasteurianum
Abstract(#br)Batch-wise butanol removal using vacuum pervaporation (VPV) was investigated to assess its technical feasibility for future integration with a continuous PBE (1,3-propanediol-butanol-ethanol) fermentation process using glycerol as feedstock. Two commercial polydimethylsiloxane (PDMS) membrane configurations were characterized using binary model solutions and authentic fermentation broths, while varying feed temperature, butanol concentration and flow rate.
Separation of fermentation products from ABE mixtures by perstraction using hydrophobic ionic liquids as extractants
Abstract(#br)In this work, the perstraction process was implemented to separate butanol, acetone and ethanol from aqueous solutions using four different commercial hydrophobic ionic liquids (ILs) as receiving phase: [bmin][PF 6 ], [bmim][Tf 2 N], [omim][Tf 2 N] and [P 6,6,6,14 ][DCA].
垂直排列碳纳米管纳米通道的渗透汽化膜，用于增强丁醇回收率
摘要\n制备了垂直排列( VA )和开放式碳纳米管( CNT )阵列填充聚二甲基硅氧烷( PDMS )复合膜，并对丙酮-丁醇-乙醇( ABE )发酵液中丁醇的渗透汽化回收进行了表征和评价。与均相PDMS膜相比，VA CNT ( open-end ) / PDMS膜表现出了各种优势，因为VA CNT ( open-end ) / PDMS膜表现出了同时提高丁醇通量和分离因子的作用，这是该膜较高的丁醇溶解度和扩散率的结果。丁醇通量和分离因子均随进料温度( 30 ~ 80℃)和进料丁醇浓度( 5 ~ 25g / L )的增加而急剧增大，80℃时VA CNT / PDMS膜的最大总通量和丁醇分离因子分别达到1093.7g / m2h和37.6。复合膜表现出稳定的性能，与发酵液长期连续运行，用于生物丁醇生产。总体而言，VA CNT ( open-ended ) / PDMS膜比均相PDMS膜具有更高的丁醇通量和选择性，在ABE发酵分离丁醇方面潜力。
优化PDMS / PVDF复合膜从水溶液中回收丁醇的分离性能和界面结合力
Abstract(#br)Bio-butanol is an important aspect for development of renewable energy. Currently, it remains challenging for developing highly permeable and selective composite membranes to efficiently recover butanol produced in biomass fermentation process. In this work, we fabricated polydimethylsiloxane (PDMS) into thin and defect-free composite membranes by using porous PVDF as the substrate. The formation of PDMS membrane layer was finely controlled by optimizing the substrate pore size and casting solution viscosity.
PDMS与分子填料反应共混膜及其在水溶液中生物丁醇回收中的应用
由聚合物基体中的填料组成的混合基质膜( MMM )为开发高性能膜提供了一种很有前景的方法，但在实现理想的填料分散和界面形貌方面仍存在挑战。在此，我们通过一种新的反应掺入方法报道了一种具有填料分子级分散的新型MMM。具体而言，将带有乙烯基的多面体低聚倍半硅氧烷( POSS )与乙氧基接枝，与端羟基聚二甲基硅氧烷( PDMS )链构建共价键，制备出与POSS分子均匀分散的PDMS MMMs。通过SEM、AFM、TEM表征，以及XRD分析，对POSS在PDMS基体中的分子分散进行了可视化表征。通过DSC、TGA、DMA等测试手段分析POSS / PDMS MMMs的热学和力学性能，考察了POSS反应掺入对PDMS链构象的影响。采用接触角测试研究表面亲和力，正电子湮没技术探测自由体积，分别与POSS / PDMS MMMs的吸附和扩散行为相关。结果表明，POSS的分子笼和交联作用导致大自由体积的增加而小自由体积的下降。因此，仅添加2 wt . % POSS的PDMS MMM同时提高了PDMS膜的正丁醇渗透率( 78 % )和正丁醇/水选择性( 124 % )，突破了现有有机亲水膜的性能限制。提出的反应掺入法可为开发高效的分子分离膜提供平台。