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Pretreatment of poly (acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential

连续渗滤法预处理聚丙烯酸钠以及过滤电势随时间的变化

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Abstract

The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT.

摘要

用超滤膜采用连续渗滤法对聚丙烯酸钠(PAAS)进行预处理以去除PAAS溶液中的小分子。研究 了 PAAS浓度、pH值、跨膜压差(TMP)和预处理时间对透过液浓度和渗透通量的影响。结果表明,所 需预处理时间(NPT)随着PAAS浓度的增加而增加,随着TMP的增加而减小。渗透通量随时间的变化 趋势受pH值的影响,在pH为5.0、7.0和9.3时,渗透通量开始迅速下降,然后随着渗滤时间的延长 逐渐增加直至稳定值;然而,在等电点pH值为3.0时,渗透通量随着渗滤时间的延长逐渐减小。在 pH大于等电点(IEP)进行渗滤时,小分子比较容易去除。过滤电势随时间的变化趋势与渗透浓度的变 化趋势相似,但前者对预处理效果的指示更便捷。

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Jing-yuan Xu  (徐静远), Shu-yun Tang  (汤淑云) & Yun-ren Qiu  (邱运仁)

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  1. Jing-yuan Xu  (徐静远)
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  2. Shu-yun Tang  (汤淑云)
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  3. Yun-ren Qiu  (邱运仁)
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Correspondence to Yun-ren Qiu  (邱运仁).

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Foundation item: Projects(21176264, 21476265) supported by the National Natural Science Foundation of China

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Xu, Jy., Tang, Sy. & Qiu, Yr. Pretreatment of poly (acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential. J. Cent. South Univ. 26, 577–586 (2019). https://doi.org/10.1007/s11771-019-4029-3

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  • DOI: https://doi.org/10.1007/s11771-019-4029-3

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