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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 3    March 2019

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Pretreatment of poly (acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential
XU Jing-yuan(徐静远), TANG Shu-yun(汤淑云), QIU Yun-ren(邱运仁)

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

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.

 

Key words: pretreatment; diafiltration; ultrafiltration; poly(acrylic acid) sodium; filtration potential

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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