Chapter 5
demulsifier PR5 prepared as described in section 5.3.1. In the figure samples 2
and 3 have clearer aqueous phases than others. Sample 2 has more separated
free water and thinner rag layer. So sample 2 with silicate at initial pH 8.5 has the
best emulsion separation.
Control PRi PR2 PR3 PR4 PR5 PR5
Figure 5.1 24 h emulsion adding 200 ppm demulsifier PRi - PR5 at 50 0C
Sample: 12 3
Adding: Na2SiOs NaOH
I. pH: 8.3 8.5 8.5
E. pH: 8.0 8.0-8.5 8.0-8.5
4
Na2SiOs
8.8
8.5
5 6
NaOH Na2SiO3SNaOH
8.8 8.8
8.5 8.5
Figure 5.2 Photographs of 24 h emulsion with 200 ppm PR5 adding NaOH or
Na2SiO3 at different pH
151
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