Effects in the solubility of CaCO3: Experimental study and model description

Coto, Baudilío; Martos, M.; Peña, José L.; Rodríguez, Rosalía; Pastor, Gabriel

doi:10.1016/j.fluid.2012.03.020

Cited by 184 publications

(98 citation statements)

References 35 publications

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“…It eventually results in stagnant fluid movement in the pores, and membrane wetting occurs increasingly as growth of salt crystals is expedited. (Ca,Mg)CO3 minerals to some extent [46]. Thus, in our study, it is likely that the high feed temperature promoted the formation of carbonate minerals, and the relatively large amount of precipitates covered the membrane surface within the short period of time.…”

Section: Long-term Distillationmentioning

confidence: 58%

“…Meanwhile, the smaller avg. J/J 0 value at 20 mM NaCl (0.926) than at 500 mM NaCl (0.938) may be due to the more favorable condition for precipitation of (Ca,Mg)CO 3 minerals at 20 mM NaCl such that excessive NaCl concentration can increase the solubility of (Ca,Mg)CO 3 minerals to some extent [46]. Thus, in our study, it is likely that the high feed temperature promoted the formation of carbonate minerals, and the relatively large amount of precipitates covered the membrane surface within the short period of time.…”

Section: Permeate Flux Variation At ∆40˝c and ∆60˝cmentioning

confidence: 97%

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Treatment of Simulated Coalbed Methane Produced Water Using Direct Contact Membrane Distillation

Cho

Song

Yoon

et al. 2016

Water

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Expolitation of coalbed methane (CBM) involves production of a massive amount saline water that needs to be properly managed for environmental protection. In this study, direct contact membrane distillation (DCMD) was utilized for treatment of CBM-produced water to remove saline components in the water. Simulated CBM waters containing varying concentrations of NaCl (1, 20, and 500 mM) and NaHCO 3 (1 and 25 mM) were used as feed solutions under two transmembrane temperatures (∆40 and 60˝C). In short-term distillation (~360 min), DCMD systems showed good performance with nearly 100% removal of salts for all solutes concentrations at both temperatures. The permeate flux increased with the feed temperature, but at a given temperature, it remained fairly stable throughout the whole operation. A gradual decline in permeate flux was observed at ∆60˝C at high NaHCO 3 concentration (25 mM). In long-term distillation (5400 min), the presence of 25 mM NaHCO 3 further decreased the flux to 25%-35% of the initial value toward the end of the operation, likely due to membrane fouling by deposition of Ca-carbonate minerals on the pore openings. Furthermore, pore wetting by the scalants occurred at the end of the experiment, and it increased the distillate conducitivity to 110 µS¨cm´1. The precipitates formed on the surface were dominantly CaCO 3 crystals, identified as aragonite.

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Section: Long-term Distillationmentioning

confidence: 58%

Section: Permeate Flux Variation At ∆40˝c and ∆60˝cmentioning

confidence: 97%

Treatment of Simulated Coalbed Methane Produced Water Using Direct Contact Membrane Distillation

Cho

Song

Yoon

et al. 2016

Water

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“…Según Coto et al (2012), la presión parcial de CO 2 tiene un efecto marcado, ya que existe una directa relación con la solución de pH, y este puede modificar la cantidad de especies iónicas presentes en la solución acuosa, y por lo tanto, el aumento de la solubilidad del carbonato de calcio Con la evaluación de los modelos se identificaron diferentes tipos de agua en cuanto a su composición iónica. Para el periodo lluvioso las aguas fueron clasificadas como cloruradas en todas las localidades y mediante el modelo general también se estimaron aguas cloruradas, mientras que para el periodo seco en las localidades L1, L2, L3 y L4 sus aguas freáticas presentaron diferentes clasificaciones entre ellas, aguas cloruradas, sódicas, magnésicas y potásicas respectivamente y como aguas magnésicas para el modelo general (Tabla 2).…”

Section: Resultados Y Discusiónunclassified

Estimación de la salinidad en aguas freáticas del área de influencia de la desembocadura del río Sinú-Córdoba, Colombia

C.¹,

M.²,

B³

2015

Idesia

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RESUMENLas sales disueltas en aguas freáticas y la proximidad de un río y costas marinas son condiciones que generan acumulación de sales en el suelo. El objetivo del trabajo fue estudiar la tendencia de la salinidad de las aguas freáticas someras en el área de influencia de la desembocadura del río Sinú en Córdoba-Colombia. El área de estudio de 82 km 2 se subdividió en cuatro localidades próximas a la desembocadura del río Sinú, donde se instalaron 39 pozos de observación distribuidos en 25 pozos en vértices principales con espaciamiento de 2 km entre sí y 14 en vértices auxiliares con espaciamiento de 1 km respecto de los principales. Para el muestreo de las aguas freáticas se definieron los periodos correspondientes a la época seca y lluviosa del año. El análisis químico de las muestras de agua se realizó en el Laboratorio de Suelos y Aguas de la Universidad de Córdoba. En las muestras se determinó la conductividad eléctrica (CE), pH, Ca, Mg, Na, K, HCO 3 , CO 3 y SO 4 . Los datos obtenidos fueron analizados mediante análisis de varianza y pruebas de separación de medias (Tukey) (p≤0.05), además análisis de correlación simple entre CE e iones solubles y la estimación de modelos de CE por el método de regresión por pasos (The Stepwise regresión procedure) y clasificación de las aguas freáticas basándose en la contribución de cada variable en los modelos. Los resultados indican que las aguas son marcadamente salinas en localidades próximas a la desembocadura del río Sinú y asociadas a los niveles de iones Cl, Na y Mg. Los modelos de CE calculados para las localidades presentan R 2 ≥ 0,94; indicando alto grado de confiabilidad para la estimación de la CE, igualmente se determinó que el tipo de aguas que predomina son las cloruradas en el periodo lluvioso y en el periodo seco no predomina ningún tipo de sal.Palabras clave: Estuarios marinos, conductividad eléctrica, aguas freáticas, modelos de regresión, clasificación iónica de aguas. ABSTRACT

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“…• C and 0.319 · 10 3 at 50 • C. Secondly, from literature is know that the solubility of Calcite decreased with increasing temperature, as shown in figure 3.1 [Coto et al 2012].…”

Section: Effect Of Temperature On the Calcite Dissolutionmentioning

confidence: 93%

“…• C. However, from literature [Coto et al 2012] is observed that the solubility of Calcite decreases with temperature. From PHREEQC data was observed that in a CO 2 -free environment, the Calcite dissolution increases with increasing temperature from 22…”

Section: Effect Of Temperature On the Calcite Dissolutionmentioning

confidence: 99%

Calcite Dissolution Behaviour During Low Salinity Water Flooding in Carbonate Rock

Ouden¹,

Nasralla²,

Guo³

et al. 2015

Proceedings

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Master of ScienceCalcite dissolution behaviour during low salinity water flooding in carbonate rockby Liselotte den OudenLow salinity water flooding (LSF) has been proved to be a promising enhanced oil recovery method for sandstone reservoirs. The efficiency of LSF in carbonate reservoirs has not been proven completely yet, because there are still uncertainties about the LSF recovery mechanism in carbonate. From experimental studies, it was shown that wettability alteration, due to salinity reduction, is able to mobilize the remaining oil. Some studies attributed the wettability alteration by LSF to Calcite dissolution. Furthermore, Calcite dissolution can influence the salinity and pH of injected brines, and hence the oil recovery.However, there is a lack of experimental data on the Calcite dissolution effect of LSF in carbonate rock.The objective of this experimental study was to get a better understanding of the Calcite dissolution behaviour and how it might affect the oil recovery. Bulk and coreflood experiments have been performed; the experimental data was history matched with the use of PHREEQC. Calcite dissolution decreased with decreasing P CO2 and increased with decreasing pH and increasing NaCl salinity from 500-2000PPM.Increasing the injection rate reduced the interaction time and therefore Calcite dissolution did not reach equilibrium in coreflood at high rates. Calcite dissolution from chalk matched with the Calcite dissolution from pure Calcite, while Calcium concentration in effluent from limestone was higher. The two-phase coreflood experiment confirmed that Calcite dissolution occurs as well if oil is present in the porous media, but showed lower values than in single-phase coreflood experiment. pH increased from 5-6 to 9.5 due to Calcite dissolution, which might have an effect on the rock and oil surface charges, and hence oil recovery improvement. The effluent of the two-phase coreflood showed that an emulsion was formed, which suggested formation of in-situ surfactants. From CT scans, micro-CT scans and material mass balance calculations an increase in porosity around 1% was observed. The increase in the total dissolved species due to Calcite dissolution was not significant, which will not harm LSF effect.

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Effects in the solubility of CaCO3: Experimental study and model description

Cited by 184 publications

References 35 publications

Treatment of Simulated Coalbed Methane Produced Water Using Direct Contact Membrane Distillation

Treatment of Simulated Coalbed Methane Produced Water Using Direct Contact Membrane Distillation

Estimación de la salinidad en aguas freáticas del área de influencia de la desembocadura del río Sinú-Córdoba, Colombia

Calcite Dissolution Behaviour During Low Salinity Water Flooding in Carbonate Rock

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