Collaborative Research Center/Transregio 63

"Integrated Chemical Processes in Liquid Multiphase Systems"

>Research>Completed Projects>Project A5 E

A5 Measurement of Phase Equilibria in Surfactant Containing Systems (completed)

Sub-Coordinator: Prof. Dr. Sabine Enders
 

State of the art

The experimental data base related to these systems is very limited. Only for the binary subsystem C12E8 + water a few data, which are not always consistent, are available in the public literature. One possible reason for this situation is the very low solubility of dodecene in water, which is below the sensitivity of the usually experimental analysis technique. Unfortunately, thermodynamic models existing today are not able to predict the phase behavior of the ternary systems, quantitatively. For this reason experiments must be performed in order to fulfill the necessary condition for the optimization of the hydroformylation of dodecene in microemulsions.

Research goals

The most important goal of this project is to close the gap related to the knowledge of the complex phase equilibria in the ternary systems. First, the involved phase behavior of the binary subsystems will be measured. The experimental challenge arises for the binary subsystem dodecene + water. Hence, the first goal is establishment of a suitable analytical method in order to measure the dodecene concentration in water or alternatively the establishment of an enrichment method for dodecene. The experiments related to the ternary system aims to the measurement of the so-called "Kahlweit´s fish", the cloud point curves, and the tie lines.

Recent results
  • LLE data for the binary system C12E8 + water
  • LLE data for the binary system 1-dodecene + water
  • Phase prism for ternary system C12E8 + 1-dodcene + water
  • Kahlweit´s fish at α=0.5
More information
  • Thermodynamic description of phase equilibria and interface with reasonable molecular models
Dissertations

Schrader, P.Experimental investigation of the complex liquid liquid equilibrium in the system pure/technical grade nonionic surfactant + water + oil. Technische Universität Berlin, 2014.
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Last updated:22-11-2018