dc.contributor.advisor Tomson, Mason B. Xiao, Jianjun (Alan) 2009-06-04T08:20:15Z 2009-06-04T08:20:15Z 1997 https://hdl.handle.net/1911/17144 Phosphino-polycarboxylic acid (PPCA) and its modified types have the potential to be used as multifunctional inhibitors and they have advantages over unifunctional inhibitors in performance, thermal stability, dispersancy and environmental acceptability. The thermodynamic properties of PPCA have therefore been investigated by means of experiments at high ionic strength and high temperature. These properties include the equilibrium constant of proton association-dissociation $\rm (pK\sb{H}),$ the equilibrium constant of Ca-PPCA complexation $\rm (pK\sb{M})$ and the equilibrium constant of CaPPCA precipitation-dissolution $\rm (pK\sb{sp}).$ In this thesis, relationships between these constants and temperature, ionic strength, pH, and concentration are developed. Relevant to these thermodynamics, models on multi-equilibria of polyelectrolytes are discussed and a method of defining the solubility product of CaPPCA is developed. An improved method to measure PPCA in brines was also developed. Finally, application of these results to scale control in gas and oil production is discussed with specific field results. 146 p. application/pdf eng Physical chemistryEnvironmental science Solution chemistry of phosphino-polycarboxylic acid (PPCA) at high ionic strength and high temperature Thesis Text Chemistry Natural Sciences Rice University Masters Master of Science Xiao, Jianjun (Alan). "Solution chemistry of phosphino-polycarboxylic acid (PPCA) at high ionic strength and high temperature." (1997) Master’s Thesis, Rice University. https://hdl.handle.net/1911/17144.
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