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Recovery of surfactant from micellar-enhanced ultrafiltration using a precipitation process

  • Surfactants And Surfactant Application
  • Conference paper
  • First Online:
Horizons 2000 – aspects of colloid and interface science at the turn of the millenium

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 109))

Abstract

A precipitation method is proposed to recover anionic surfactants from a micellar-enhanced ultrafiltration (MEUF) process. Monovalent potassium ion is used to precipitate the dodecylsulfate anion from sodium dodecylsulfate (SDS). The recovery process is quick and clean and requires adding smaller amounts of the electrolyte than if the sodium cation is used to precipitate dodecylsulfate. No substantial loss of organic solutes (phenol and tert-butylphenol) occurs during the precipitation, as was observed when sodium ion was used as the precipitant. It has been shown that potassium dodecylsulfate (KDS) is similar to SDS in its cmc, water solubility, and ability to solubilize organic solutes in micellar solutions. However, KDS has a significantly higher Krafft point than SDS (35 °C). An MEUF experiment using KDS as the model surfactant gave large rejection of tert-butylphenol (96%). Based on these findings, KDS is proposed as a potential surfactant for use in MEUF, with recovery of the surfactant to be accomplished by lowering the system temperature below the Krafft point.

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Abbreviations

K sp :

solubility product of KDS (M2)

γm :

mean activity coefficient calculated by the extended Debye-Hückel equation

cM:

concentration of unbounded ion M (M)

cDS −mono :

concentration of monomeric dodecylsulfate anion (M)

K mic :

micellization constant, in molar units

n:

aggregation number for dodecylsulfate anion

q:

aggregation number for counterion

c micelle :

surfactant concentration in micellar form (M)

I:

ionic strength (M)

Ratio:

mole fraction of K+ ion in the total aqueous dissolved cation concentration

cMtot:

total amount of ion M (mol)

KDSprept :

amount of KDS precipitated (mol)

SDStot :

amount of SDS before adding KCl (mol)

R K:Na :

concentration ratio of KCl to SDS

Dstot:

total amount of dodecylsulfate remaining in solution after precipitation (mol)

SDSprept :

amount of SDS incorporated into the KDS solid (mol)

K:

proportionality constant for SDS incorporation

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Authors and Affiliations

  1. Institute for Applied Surfactant Research, University of Oklahoma, 73019, Norman, Oklahoma, USA

    B. Wu, S. D. Christian & J. F. Scamehorn

Authors
  1. B. Wu
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  2. S. D. Christian
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  3. J. F. Scamehorn
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G. Lagaly

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© 1998 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG

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Wu, B., Christian, S.D., Scamehorn, J.F. (1998). Recovery of surfactant from micellar-enhanced ultrafiltration using a precipitation process. In: Lagaly, G. (eds) Horizons 2000 – aspects of colloid and interface science at the turn of the millenium. Progress in Colloid & Polymer Science, vol 109. Steinkopff. https://doi.org/10.1007/BFb0118158

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  • DOI: https://doi.org/10.1007/BFb0118158

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-1113-2

  • Online ISBN: 978-3-7985-1654-0

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