Chapter 4
with 100 ppm naphthenate (2.25×10^5 M). Water-wet fraction of kaolinite
increases from 50% to 88% when added betaine 13 increases from 100 ppm to
200 ppm. When added betaine 13 increases to 1000 ppm, water-wet fraction only
increases from 88% to 92%. If 200 ppm is chosen as optimal dosage of betaine
13, it is much larger than the 1:1 stoichiometry value with 100 ppm naphthenate.
Figure 4.8 Water-wet fraction of kaolinite with 100 ppm naphthenate adding 1000
ppm betaine at pH 8.3
Betaine 13 is an electrically neutral chemical compound with a positively
charged cationic ammonium ion and a negatively charged functional carboxylate
group, which is referred to as a specific type of zwitterion. At a certain pH, betaine
102