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Reaction between tetrameric acids and Ca2+ in oil / water system / Sébastien Simon in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5669-5676 Titre : Reaction between tetrameric acids and Ca2+ in oil / water system Type de document : texte imprimé Auteurs : Sébastien Simon, Auteur ; Christian Reisen, Auteur ; Anita Bersas, Auteur Année de publication : 2012 Article en page(s) : pp. 5669-5676 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Tetrameric  acids Résumé : C80 tetra-acid (also known as ARN) is a molecule present in crude oil that can precipitate during oil production in basic medium and in presence of calcium ions to form deposits. The formation of such deposits is detrimental in production because they can plug oil production facilities and may lead to costly production shutdowns due to deferment and clean up operations. To better understand this reaction, the solubility of a model molecule mimicking the properties of C80 tetra-acid (named BP-10) have been measured in an oil/water system, using chloroform as oil in presence of calcium to establish quantitative relationships between solubility and pH, calcium concentration, temperature, and other parameters. It has been determined that the maximum BP-10 concentration in oil phase (solubility limit) follows the following relationship: [BP-10]o = A X 10-4pH, with the fitting parameter A X [Ca2+]2 = 2.6 × 1018 mol-1·L+1. This relationship is valid at [Ca2+] ≥ 10 mM, with a slight overestimation of the solubility at lower calcium concentration from temperatures varying from 5 to 50 °C. This relationship holds at any ionic strength (up to 600 mM of NaCl) and total BP-10 concentration (up to 200 μM) in the system. In presence of Mg2+, the relation is still valid with a different prefactor. For all the studied systems, the concentration of BP-10 in water was very low, lower than 2 μM. The solubilities of C80 tetra-acid in oil phase with BP-10 one have been compared. Both molecules have a similar pH range for precipitation, but C80 tetra-acid has a different relationship between its concentration in oil phase and pH. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3000634 [article] Reaction between tetrameric acids and Ca2+ in oil / water system [texte imprimé] / Sébastien Simon, Auteur ; Christian Reisen, Auteur ; Anita Bersas, Auteur . - 2012 . - pp. 5669-5676. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5669-5676 Mots-clés : Tetrameric  acids Résumé : C80 tetra-acid (also known as ARN) is a molecule present in crude oil that can precipitate during oil production in basic medium and in presence of calcium ions to form deposits. The formation of such deposits is detrimental in production because they can plug oil production facilities and may lead to costly production shutdowns due to deferment and clean up operations. To better understand this reaction, the solubility of a model molecule mimicking the properties of C80 tetra-acid (named BP-10) have been measured in an oil/water system, using chloroform as oil in presence of calcium to establish quantitative relationships between solubility and pH, calcium concentration, temperature, and other parameters. It has been determined that the maximum BP-10 concentration in oil phase (solubility limit) follows the following relationship: [BP-10]o = A X 10-4pH, with the fitting parameter A X [Ca2+]2 = 2.6 × 1018 mol-1·L+1. This relationship is valid at [Ca2+] ≥ 10 mM, with a slight overestimation of the solubility at lower calcium concentration from temperatures varying from 5 to 50 °C. This relationship holds at any ionic strength (up to 600 mM of NaCl) and total BP-10 concentration (up to 200 μM) in the system. In presence of Mg2+, the relation is still valid with a different prefactor. For all the studied systems, the concentration of BP-10 in water was very low, lower than 2 μM. The solubilities of C80 tetra-acid in oil phase with BP-10 one have been compared. Both molecules have a similar pH range for precipitation, but C80 tetra-acid has a different relationship between its concentration in oil phase and pH. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3000634