Adsorption behavior of surfactants and mass transfer in single-drop extraction

Iang Huei Chen, Yuh-Lang Lee

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63 Citations (Scopus)


Three surfactants - SDS, Triton X-100, and DTMAC - were used to study effects of surfactants on the mass transfer in liquid-liquid extraction. Single-drop extraction apparatus was used to obtain the mass-transfer coefficient of acetic acid from dispersed CCl4 droplets to the continuous water phase. The excess mass-transfer resistance was related to the adsorption behavior of surfactants on the interface. All of these surfactants significantly reduced the mass-transfer rate. Mass-transfer coefficient, K(R), decreases rapidly with increasing surfactant concentration and reaches a minimum at concentrations less than 0.04 mM. The effectiveness of the surfactants in decreasing the mass-transfer rate increases in the order: DTMAC < SDS = Triton X-100. This effectiveness has no direct relation with the ionic types of surfactants, but is affected by the adsorption rate and adsorbed surface concentration on the interface. A slight increase in the mass-transfer coefficient was found at higher concentrations of Triton X-100 due to its higher adsorption kinetics. The excess mass-transfer resistance exerted by the surfactant mainly resulted from the obstruction of the adsorbed barrier layer. The contribution of the inhibition of interfacial flow to the mass-transfer resistance was considered to be minor.

Original languageEnglish
Pages (from-to)160-168
Number of pages9
JournalAIChE Journal
Issue number1
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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