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首页> 外文期刊>Separation and Purification Technology >Mass transfer in pervaporation of active fermentation broth with a composite PDMS membrane
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Mass transfer in pervaporation of active fermentation broth with a composite PDMS membrane

机译：带有复合PDMS膜的活性发酵液全蒸发中的传质

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摘要

The pervaporation behavior and mass transfer coefficients of active fermentation broth as well as concerned ethanol mixtures were experimentally investigated.Ethanol was produced by Saccharomyces cerevisiae and recovered by pervaporation using a composite polydimethyl-siloxane (PDMS) membrane prepared in the laboratory.The overall transfer coefficients across the membrane were nearly invariable when recovering ethanol from fermentation broth under the constant operating condition,which was 1.93 x 10~(-6) m/s on average for flow rate of 100 L/h,downstream pressure of 5 mmHg and cell concentration of 5 g/L at 35 deg C in contrast with 1.34 x 10~(-6) m/s for an aqueous ethanol solution under similar conditions.Ethanol fluxes and selectivities for fermentation broth were all higher than those for aqueous ethanol solution at the same feed concentration.According to the resistance-in-series model,the boundary layer transfer coefficient of fermentation broth was nearly three times as much as the value with the model solution on the assumption that diffusive transfer coefficients in the same membrane remained invariable at a constant temperature.Overall transfer coefficient increased slightly with active cell concentration for fermentation broth but decreased with solid concentration for inactive cell suspension.Active fermentation broth gave the highest transfer coefficients among the feeds involved during pervaporation using the composite PDMS membrane.
机译：实验研究了活性发酵液以及相关乙醇混合物的渗透蒸发行为和传质系数，由酿酒酵母生产乙醇，并使用实验室制备的复合聚二甲基硅氧烷（PDMS）膜通过渗透蒸发进行回收。在恒定的操作条件下从发酵液中回收乙醇时，膜的跨膜几乎不变。流速为100 L / h，下游压力为5 mmHg和细胞浓度时，乙醇平均为1.93 x 10〜（-6）m / s在35摄氏度时为5 g / L，而在相似条件下的乙醇水溶液为1.34 x 10〜（-6）m / s。在发酵条件下，乙醇对发酵液的通量和选择性均高于乙醇水溶液。根据串联阻力模型，发酵液的边界层转移系数几乎是发酵液的三倍。假设在相同温度下同一膜中的扩散传递系数保持不变，则模型求解的值。发酵液的总转移系数随活性细胞浓度的增加而略有增加，而无活性细胞悬浮液的总转移系数随固体浓度的降低而降低。使用复合PDMS膜在全蒸发过程中涉及的进料中具有最高的传递系数。

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