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Thin Liquid Films: WaterinBitumen Emulsions
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Title: Thin Liquid Films: WaterinBitumen Emulsions
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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
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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
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What is a Thin Film?
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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
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Experimental Concept
Emulsion
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Schematic of TLF-PBT
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Outline of Experiments
- Determine the effect of solventbitumen ratio on
- Disjoining pressure
- Film Lifetime
- Solvents
- Toluene heptane
- Simulated industrial water
Diluted Bitumen Film
Water
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Typical Film Behaviour(31 toluenebitumen)
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Typical Film BehaviourTolueneBitumen31
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Measured Parameters Equivalent Film Thickness
- Two surfactant layers
- liquid core
- Accuracy
- Ideal films ? 0.1 nm
- Bitumen films 0.5 nm
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Measured Parameters Disjoining Pressure
Isotherms
- Excess pressure due to molecular interactions
between the interfaces - Acts normal to the interface
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Disjoining Pressure IsothermToluene Diluted
Bitumen
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Measured Parameters Film Lifetime
- Time from film formation to film rupture.
- A stable film will have an infinite lifetime.
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Film LifetimeHeptane Diluted Bitumen
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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
