Chapter 5
5.7.3.3. Lower limit of K-F titration
Table 5.5 shows water content in diluted bitumen (after centrifugation, dilution
ratio 0.7) mixed with different amount of toluene. First column in the table is
diluted bitumen content in diluted bitumen-toluene mixture. Second column in the
table is measured water content in the mixture sample. Third column in the table
is calculated water content in diluted bitumen.
Table 5.5 K-F titration of water content in diluted bitumen mixed with toluene
|
Diluted bitumen % in mixture |
Water % in sample |
Water % in diluted bitumen |
|
100 |
0.27 |
0.27 |
|
50 |
0.15 |
0.31 |
|
25 |
0.04 |
0.17 |
|
10 |
0.02 |
0.23 |
|
5 |
0.02 |
0.43 |
|
1 |
0.02 |
1.98 |
As diluted bitumen content decreases, measured water content in the mixture
sample reaches minimum 0.02 %. This is the lower limit of water content in diluted
bitumen that can be measured by K-F titration.
Figure 5.14 shows measured water content by K-F method as function of
diluted bitumen content in diluted bitumen-toluene mixture. When diluted bitumen
content in diluted bitumen-toluene mixture is larger than 10 %, the variation is
172
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