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Chapter 6

sample quantities and the measurement itself is convenient. The lower limit of
water content in diluted bitumen that can be measured by K-F titration is 0.02 %,
which is not very easily measured by other methods. The titration results are
consistent with different water amounts in diluted bitumen. The largest deviation
between the measured water content and actual water content was less than 5%
for the samples studied.

Dilution ratio of diluted bitumen has effect on emulsion stability. Residual
water and solid contents in emulsion with N∕B 0.7 are higher than that with 4.0.
The reason could be the viscosity and density difference. Higher viscosity of oil
and lower density difference between oil and water can slow the sedimentation of
waterand solid in oil. Based on Stokes’ Law, sedimentation rate Ofwaterand solid
in diluted bitumen with N/В ratio 4.0 is 8.1 times faster than that with N/В ratio 0.7.

With silicate, residual water and solid contents are lower and less solids stay
in oil and more solids settle to the bottom. Emulsion with N∕B 4.0 adding 200 ppm
PR₆ meets desired residual water and solid criteria.

Clay solid has asphaltene content: in oil layer > in rag layer > at bottom layer.
At the same layer, sample with N/В ratio 0.7 has higher asphaltene content in
solid than that with N/В ratio 4.0.

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