Buffering apabiliti of B-chloropropionic Acid-Sodium B-chloropropionate Slstellin Acidic Geotherllal Brine

  • Yolanda P Brondial Chemical Engineering Department, De La Salle University
Keywords: Acidic geothermal wells, B-chloropropionic acid-sodium B-chloropropionate (BCPH NaBCP) buffer, corrosives, geofluid, pH buffering

Abstract

The Philippines, being part of the Pacific "Ring of Fire," has abundant geothermal energy. Since a substantial number of drilled wells produce acidic geofluid with high enthalpy and high wellhead pressure, it becomes imperative to develop these wells for power generation. A potential pH-buffering method for commercializing high- enthalpy acidic geothermal wells was explored in this study to raise the pH of the geofluids to ~3.5, the level considered by geothermal reservoir engineers to be noncorrosive to low-carbon steel. The noncondensible gases of acidic geothermal wells are relatively high in H2S and C02 while the brine is high in sulphates. These substances, aside from being potential hazards, account ror the acidity of geofluid. Design-Expert@ 6 was used in modeling pH buffering using five design factors (pH geofluid, pH BCPH-NaBCp, volume BCPH-NaBCP, concentration BCPH-NaBCp, and temperature of solution) and one response factor (pH of resulting solution). Two experimental designs were used for the study. Experimental laboratory results showed that BCPH-NaBCP could raise the pH to >3.5 and that the initial pH of the geofluid as well as the pH, concentration, and volume of the BCPH-NaBCP solution significantly influenced the stable pH of the final solution. The best combination of factors was then used in a bench scale setup to investigate the possibility of applying pH buffering at high velocity. Results showed that BCPH-NaBCP was useful for fast buffering and could be used to commercialize acidic wells.

References

Abe, M. (1993). “Long-term use of acidic reservoir at Onikobe Geothermal Power Plant." Proceedings of the 15th New Zealand Geothermal Workshop. 5–10.
Brondial, Y. P., and Puertollano, A. A. (2000a). "PH buffering for acidic geothermal wells utilization," Inhenyeriya, 1, Book 2.
Brondial, Y. P., and Puertollano, A. A. (2000b, December 3-6). "PH buffering formulations for acidic geothermal wells." Proceedings of the 3rd Asia Pacific Conference on Sustainable Energy and Environmental Technologies, Hong Kong.
Dean, J. (1999). Lange's handbook of chemistry, 15th ed., McGraw-Hill, Inc. Ellis,
A. J., and Giggenbach, W. F. (1971). "Hydrogen sulphide ionization and sulfur hydrolysis in high temperature solution," Geochim. Cosmochim. Acta, 35, 247-26.
Gardner, A. B., Rivera, N. N., Santos, R. M., Toreja, J. S., Vilaseñor, L. B., and Gallup, D. L. (2001, March 13-14). “Mitigation of corrosion in an acid-producing well at Tiwi Geothermal Field." 22nd Annual PNOC-EDC Geothermal Conference Proceedings, Makati City, Philippines.
Harris, D. C. (1999). Quantitative chemical analysis, 5th ed., W. H. Freeman and Company, New York.
Kenner, C. T., and Busch, K. W. (1979). Quantitative analysis, Macmillan Publishing Company, New York.
Matsuda, K., Shimada, K., and Kiyota, Y. (2000, May 28-June 10). "Development of study methods for clarifying formation mechanism and distribution of acid geothermal fluid-Case studies of geothermal areas in Kyushu, Japan." Proceedings of the World Geothermal Congress 2000,
Kyushu-Tohoku, Japan. Meeker, K. A., and Haizlip, J. R. (1990, August). **Factors controlling pH and optimum corrosion mitigation in chloride-bearing geothermal steam at The Geysers," Geothermal Resources Council Transactions, 14, Part II.
Quijano, J. L. (1993). "Current state of geothermal energy in Mexico," Int. Geoth. Assoc. News.
Sanchez, D. R., Herras, E. B., Siega, F L., Salonga, N. D., Nogara, J. B., and San, B. G. (2001, March 13–14). “Evaluation of NaOH injection into acid wells of Leyte Geothermal Production Field and Mindanao I Geothermal Project: The case of MG 9D and KN2D wells." Proceedings of the 22nd Annual PNOC-EDC Geothermal Conference, Makati City, Philippines. Villa,
R. R. (1999, March 4-5). "Corrosion induced by CO, and H,S-saturated steam condensates in the Upper Mahiao Pipeline, Leyte, Philippines," 20th Annual PNOC-EDC Geothermal Conference, New World Hotel, Makati City, Philippines.
Published
2004-12-31
How to Cite
Brondial, Y. P. (2004). Buffering apabiliti of B-chloropropionic Acid-Sodium B-chloropropionate Slstellin Acidic Geotherllal Brine. ASEAN Journal of Chemical Engineering, 4(2), 7-15. Retrieved from https://journal.ugm.ac.id/v3/AJChE/article/view/7594
Section
Articles