Measurement of CO₂Solubility in NaCl Brine Solutions at Different Temperatures and Pressures Using the Potentiometric Titration Method

Abstract

The solubility of CO 2 in brine is one of the trapping mechanisms by which the CO 2 is sequestrated in aquifers. In this research, an unconventional method, called the potentiometric titration, was used to obtain the solubility of CO 2 in distilled water and NaCl brine. The solubility data for the low salinity range are scarce in the literature. Thus, in this research, the CO 2 solubility was obtained in NaCl brines of low salinity (0−15 000 ppm) at temperatures between 60°C and 100°C and pressures up to 25 MPa. Moreover, the salting-out effect was estimated using the Setchenov's constant as a measure of reduction in solubility when salt is added to the solution. The solubility points obtained by the potentiometric titration method demonstrated very good consistency with those obtained by the previous methods.

Experimental Investigation of Interfacial Tension Measurement and Oil Recovery by Carbonated Water Injection: A Case Study Using Core Samples from an Iranian Carbonate Oil Reservoir

“…Apparatus. The experimental setup presented by Mohammadian et al 48 was used to measure CO 2 solubility in brine under different pressures and temperatures. The solubility measurement setup consists of an ISCO pump (Teledyne, 100 DX), a 100 mL autoclave reactor equipped with a stirrer, CO 2 cylinder, an electric heater, and a 1/8 in.…”

Derivation of a pH Dependent Solid-Liquid Interfacial Tension and Theoretical Interpretation of the Physicochemistry of Dewetting in the CO2-Brine-Silica System

“…To validate our model (Eq. (36)) in the thermodynamic context, we noticed that the solubility of carbon dioxide is a function of salinity and temperature (Mohammadian et al, 2015), and that a plot of contact angle versus pressure must also give a parabolic trend like that of contact angle versus pH. What is more, there is a correlation between hydrogen ion concentration and the pH of an aqueous solution (Bain et al, 1989).…”

Algal Communities: An Answer to Global Climate Change

“…Moreover, some toxic ions such as chloride may interrupt normal cell growth . Salinity can also affect the solubility of various gases such as CO 2 in the oceans . Moreover, salt concentrations affect photosynthesis and respiration rates in algae and inhibit cell division and production of biomass .…”

“…[112] Salinity can also affect the solubility of various gases such as CO 2 in the oceans. [113] Moreover, salt concentrations affect photosynthesis and respiration rates in algae [114] and inhibit cell division and production of biomass. [115] Some algal strains naturally have the ability to grow in hyper-saline water.…”