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Related Experiment Videos

Colloidal interactions between Langmuir-Blodgett bitumen films and fine solid particles.

Jun Long1, Liyan Zhang, Zhenghe Xu

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 4, 2006
PubMed
Summary

Surface-active compounds impact oil sand bitumen recovery. Higher pH and lower divalent cations enhance repulsive forces, improving bitumen extraction and froth treatment processes.

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Area of Science:

  • Colloid and Surface Science
  • Petroleum Engineering
  • Materials Science

Background:

  • Surface-active compounds significantly influence oil sand processing, affecting bitumen recovery and froth treatment.
  • These compounds alter interfacial properties and colloidal interactions crucial for oil sand component behavior.

Purpose of the Study:

  • To investigate the colloidal interactions between bitumen films and fine solids.
  • To understand the impact of solution chemistry (pH, divalent cations) on these interactions in oil sand processing.

Main Methods:

  • Preparation of bitumen films at toluene/water interfaces using Langmuir-Blodgett (LB) deposition.
  • Atomic force microscopy (AFM) to measure colloidal forces between LB bitumen films and fine solids (silica, clay).
  • Experiments conducted in industrial plant process water and controlled electrolyte solutions.

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Main Results:

  • LB bitumen films exhibited hydrophobic surfaces with aggregated oxygen-, sulfur-, and nitrogen-rich compounds.
  • Stronger long-range repulsion and weaker adhesion were observed at higher pH and lower divalent cation concentrations.
  • In plant process water, moderate repulsion and weak adhesion were measured, despite high electrolyte levels.

Conclusions:

  • Solution chemistry, particularly pH and divalent cation concentration, plays a key role in modulating colloidal interactions in oil sand processing.
  • Findings offer deeper insights into the mechanisms governing bitumen extraction and froth treatment efficiency.