Journal of Canadian Petroleum Technology
Volume 49,
Number 8,
August 2010,
pp. 43-52
Summary
The mass transfer process during the reaction of citric acid with calcite
was investigated using a rotating disk apparatus. The effects of disk
rotational speed, initial citric acid concentration and temperature on the
effective diffusion coefficient of citric acid were examined.
Using various citric acid concentrations (1 wt%, 2 wt%, 5 wt% and 7.5 wt%),
the diffusion coefficient of citric acid was calculated at 25°C, 40°C and 50°C.
The effective diffusion coefficient of citric acid was found to be a function
of the interplay between the calcium citrate precipitation and the presence of
the counter-calcium ions. At high-initial acid concentration (5 wt% and 7.5
wt%), the effects of calcium citrate precipitation and counter-calcium ions
were significant and the calculated citric acid diffusion coefficients were not
comparable with those obtained using the rotating disk. However, the effects of
both the calcium citrate precipitation and the counter-calcium ions on the
citric acid diffusivity were minimal at low-initial citric acid
concentrations.
The effect of temperature on the diffusion coefficient of citric acid at a
constant citric acid concentration was found to follow Arrhenius law, and the
activation energy was 37.9 kJ/mol.
© 2010. Society of Petroleum Engineers
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History
- Original manuscript received:
27 March 2009
- Meeting paper published:
17 June 2009
- Revised manuscript received:
21 May 2010
- Manuscript approved:
25 May 2010
- Published online:
5 August 2010
- Version of record:
3 August 2010
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