Staged Diafiltration Cascades Provide Opportunities to Execute Highly Selective Separations
Staged Diafiltration Cascades Provide Opportunities to Execute Highly Selective Separations
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分级渗滤级联提供了执行高度选择性分离的机会
DOI：
10.1021/acs.iecr.1c02984
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发表时间：
2021
影响因子：
4.2
通讯作者：
Phillip, William A.
中科院分区：
文献类型：
--
作者：
Kilmartin, Cara P.;Ouimet, Jonathan Aubuchon;Dowling, Alexander W.;Phillip, William A.
提高溶质选择性通常是通过开发先进的膜材料来解决的问题，可以通过分段透析过滤过程来实现。建立了描述单个透析组件内溶质浓度分布的数学模型，并进行了实验验证。对于这个模块，透滤液在其长度上均匀地引入，确定了在操作期间导致保留液浓度保持恒定的临界透滤液流量。然后将该模型推广到两种不同结构的多级透滤叶栅：汽提段和精馏段。这两种配置因阶段之间的连接不同而不同。也就是说，汽提部分通过利用来自一级的保留液作为进料连接多个模块到下一级，同时将渗透液重新用作透滤液。相反，精馏部分利用来自一级的渗透液作为进料到下一级，留置液成为透滤液。对于在所有阶段都以恒定的透滤液与进料流量比运行的级联，分析表明，在将低摩尔质量的杂质从较大的不渗透分子中分离出来时，汽提部分可以减少透滤液的消耗。另一方面，精馏段结构的叶栅可以改善两种有限筛分系数介于0和1之间的溶质的分离。最后，非对称叶栅，即每一级具有唯一的透滤液与进料流量比的系统，相对于以恒定的透滤液与进料比运行的系统，能够提高流出物中溶质的回收率和纯度。总体而言，这项研究强调，膜分离的持续进步将同样依赖于深思熟虑的模块和工艺设计以及新材料的开发。
Improved solute selectivity, an issue commonly approached through the development of advanced membrane materials, can be achieved through staged diafiltration processes. A mathematical model that describes the solute concentration profile within a single diafiltration module is developed and experimentally validated. For this module, where the diafiltrate is introduced uniformly over its length, a critical diafiltrate flux that results in the retentate concentration remaining constant during operations is identified. The model is then extended to examine two configurations of multistage diafiltration cascades: stripping sections and rectifying sections. The two configurations differ based on the connectivity between stages. Namely, stripping sections connect multiple modules by utilizing the retentate from one stage as the feed to the subsequent stage while the permeate is repurposed as the diafiltrate. In contrast, rectifying sections utilize the permeate from one stage as the feed to the subsequent stage and the retentate becomes the diafiltrate. For cascades that operate with a constant diafiltrate to feed flow ratio for all stages, the analysis demonstrates that stripping sections can reduce the diafiltrate consumed when separating low molar mass impurities from larger, impermeable molecules. On the other hand, cascades in a rectifying section configuration can improve the separation of two solutes with finite sieving coefficients between 0 and 1. Finally, asymmetric cascades, i.e., systems in which each stage has a unique diafiltrate to feed flow ratio, are shown to be capable of improving the recovery and purity of solutes in effluent streams relative to systems that operate at constant a diafiltrate to feed ratio. As a whole, the study highlights that the continued advancement of membrane separations will rely equally on thoughtful module and process design as well as the development of new materials.
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作者：
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DOI：
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影响因子：
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