BACKGROUND The separation performance of seven polymer membranes for the nanofiltration of sodium lactate in fermentation broth was investigated. Each module was introduced into the test stand, and the system curve was obtained by recording the permeate flow velocity at different pump head levels. Performance benchmarks were good permeate quality, as determined by high permeate flow velocity, high sodium lactic concentration, low ion impurity concentration, and low organic impurity concentration. Market research has shown that three companies, DOW (TW30, SW30, NF45), General Electric (DK73, DL73), and Microdyn-Nadir (NP30), distributed spiral-wound membrane modules for cross-flow filtration in a 2.5 by 40-in. module size, suitable for operation in the filtration test stand. RESULTS The measured permeate flow velocity was found to vary widely between the membranes. At a pump head of 250 m, DK73, NP30, and DL73 generated more than 200, 300, and 400% higher permeate flow velocities, respectively, than TW30 and NF45. A key benchmark, lactate rejection, was also highly dependent upon membrane type. The NP30, NF45, and TW30 membranes showed a decrease in lactate permeate flow velocity of 117, 83, and 348% starting at 205, 250, and 300 m, respectively. CONCLUSIONS The DL73 had the overall best performance according to the measured fermentation broth and lactic acid permeability. The presented method for the graphical analysis of the membrane performance proofed to be a useful tool for the filtration engineer.

中文翻译：

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螺旋缠绕式膜组件的研究，该膜组件用于从发酵工厂连续生产乳酸的发酵液的错流纳滤。

背景技术研究了七个聚合物膜在发酵液中纳酸钠纳滤的分离性能。将每个模块引入测试台，并通过记录不同泵压头水平下的渗透液流速获得系统曲线。性能基准是高渗透液质量，这取决于高渗透液流速，高乳酸钠浓度，低离子杂质浓度和低有机杂质浓度。市场研究表明，陶氏（TW30，SW30，NF45），通用电气（DK73，DL73）和Microdyn-Nadir（NP30）这三家公司在2.5 x 40-在。模块尺寸，适合在过滤测试台上操作。结果发现，测得的渗透流速在不同的膜之间变化很大。在250 m的扬程下，DK73，NP30和DL73的渗透流速分别比TW30和NF45高200、300和400％。一个关键的基准，乳酸排斥，也高度依赖于膜的类型。NP30，NF45和TW30膜在205、250和300 m处分别显示出乳酸渗透流速降低了117、83和348％。结论根据测得的发酵液和乳酸渗透性，DL73总体上表现最佳。所提出的用于膜性能的图形分析的方法被证明是过滤工程师的有用工具。比TW30和NF45高出400％。一个关键的基准，乳酸排斥，也高度依赖于膜的类型。NP30，NF45和TW30膜在205、250和300 m处分别显示出乳酸渗透流速降低了117、83和348％。结论根据测得的发酵液和乳酸渗透性，DL73总体上表现最佳。所提出的用于膜性能的图形分析的方法被证明是过滤工程师的有用工具。比TW30和NF45高出400％。一个关键的基准，乳酸排斥，也高度依赖于膜的类型。NP30，NF45和TW30膜在205、250和300 m处分别显示出乳酸渗透流速降低了117、83和348％。结论根据测得的发酵液和乳酸渗透性，DL73总体上表现最佳。所提出的用于膜性能的图形分析的方法被证明是过滤工程师的有用工具。分别。结论根据测得的发酵液和乳酸渗透性，DL73总体上表现最佳。所提出的用于膜性能的图形分析的方法被证明是过滤工程师的有用工具。分别。结论根据测得的发酵液和乳酸渗透性，DL73总体上表现最佳。所提出的用于膜性能的图形分析的方法被证明是过滤工程师的有用工具。