Effect of temperature on the stability of Nujol-water emulsions
The rate of separation of oil from Nujol-water emulsions stabilized with sodium dodecyl sulfate (SDS), cetyl pyridinium chloride, Tween 20, or Triton X-100 was determined over the temperature range from 5/sup 0/ to 30/sup 0/C in an ultracentrifuge at 39,460 rpm. In all cases, both the rate of separation of oil and the amount of oil separated after a given time of ultracentrifugation increased with increasing temperature. Only in the case of Nujol-water-SDS emulsions could the rate of separation of oil be fitted to any standard form of rate equation, and in this case the data could be fitted nearly equally well by either a first order or a zero order rate law. From the temperature coefficient of the rate constant, the activation energy for the process was calculated to be about 9,000 cal. The results are discussed in terms of the various possible sequential steps involved in the overall mechanism of the separation of bulk oil in an attempt to identify the rate-determining step in the process It appears that the observed effects cannot be attributed simply to changes in viscosity with temperature.
- Research Organization:
- Calif Univ, Los Angeles; Pennsylvania Univ
- OSTI ID:
- 5468469
- Report Number(s):
- CONF-710913-
- Journal Information:
- ACS Symp. Ser.; (United States), Journal Name: ACS Symp. Ser.; (United States) Vol. COLL63; ISSN ACSMC
- Country of Publication:
- United States
- Language:
- English
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ACTIVATION ENERGY
ADDITIVES
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