The name is absent

Chapter 5

measured by pH test paper. Sample 2 was prepared with 1.0x10'⁴ M silicate. The
initial pH of the brine was 8.5. The equilibrium pH of the brine was between 8.0
and 8.5. Other combinations of alkali and pH (samples 3-6) were tried as shown
in Table 5.1.

Table 5.1 Emulsion samples with different alkali at different pH

*The initial pH of brine was measured with a pH meter without contacting with
diluted bitumen.

** The equilibrium pH of brine was measured with pH test paper when the brine
reached equilibrium with diluted bitumen.

5.3.2. Results and discussions

Figure 5.1 shows 24 hours emulsion samples prepared with synthetic brine
and diluted bitumen with dilution ratio 0.7 at 50 ⁰C₁ adding 200 ppm demulsifiers
PRi - PR₆ and 1.0x1 O’⁴ M Na2SiO3. Based on the results of bottle test, emulsion
adding PR₅ has the best separation and is chosen as the optimal demulsifier.

Figure 5.2 shows photographs of the six emulsion samples with 200 ppm

150

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