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Thin Liquid Films: WaterinBitumen Emulsions

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Thin Liquid Films: Water-in-Bitumen Emulsions. Shawn Taylor. NSERC Industrial Research Chair ... of the thin liquid films formed between two approaching water ... – PowerPoint PPT presentation

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Title: Thin Liquid Films: WaterinBitumen Emulsions


1
Thin Liquid Films Water-in-Bitumen Emulsions
  • Shawn Taylor
  • NSERC Industrial Research Chair
  • in Oil Sands Engineering
  • Department of Chemical and Materials Engineering
  • University of Alberta
  • Edmonton Alberta

2
Motivation
  • Water-in-oil emulsions commonly occur in the oil
    industry
  • Components of bitumen
  • Saturates, aromatics, resins, asphaltenes, and
    solids
  • Asphaltenes are primarily responsible for
    emulsion stability

3
What is a Thin Film?
4
Motivation
  • Emulsion stability depends strongly on the
    properties of the thin liquid films formed
    between two approaching water droplets.
  • Study a single thin film using Thin Liquid
    Film-Pressure Balance Technique
  • Investigate emulsion stability at the nanometer
    scale

5
Experimental Concept
Emulsion
6
Schematic of TLF-PBT
7
Outline of Experiments
  • Determine the effect of solventbitumen ratio on
  • Disjoining pressure
  • Film Lifetime
  • Solvents
  • Toluene heptane
  • Simulated industrial water

Diluted Bitumen Film
Water
8
Typical Film Behaviour(31 toluenebitumen)
9
Typical Film BehaviourTolueneBitumen31
10
Measured Parameters Equivalent Film Thickness
  • Two surfactant layers
  • liquid core
  • Accuracy
  • Ideal films ? 0.1 nm
  • Bitumen films 0.5 nm

11
Measured Parameters Disjoining Pressure
Isotherms
  • Excess pressure due to molecular interactions
    between the interfaces
  • Acts normal to the interface

12
Disjoining Pressure IsothermToluene Diluted
Bitumen
13
Measured Parameters Film Lifetime
  • Time from film formation to film rupture.
  • A stable film will have an infinite lifetime.

14
Film LifetimeHeptane Diluted Bitumen
15
Conclusions
  • Emulsion stability depends strongly on the
    properties of the thin film
  • 11 TolueneBitumen
  • Stable film
  • 51 and 101 TolueneBitumen
  • Film destabilized with dilution
  • HeptaneBitumen
  • Destabilized film by using aliphatic solvent
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