Florentino Murrieta-Guevara

Solubilities of carbon dioxide and hydrogen sulfide in propylene carbonate, N-methylpyrrolidone and sulfolane

Abstract Gas solubilities of carbon dioxide and hydrogen sulfide have been measured in propylene carbonate, N -methylpyrrolidone and sulfolane at several temperatures ranging from 298 to 373 K and in the pressure range 51–2330 kPa. Values of the Henrys law constant and of heat of solution were derived from the solubility data. The experimental results have been correlated with the Soave-Redlich-Kwong equation of state using a binary interaction parameter.

Solubility of CO2 in aqueous mixtures of diethanolamine with methyldiethanolamine and 2-amino-2-methyl-1-propanol

Abstract Using the static method with recirculation of the vapor phase, experimental data for the solubility of CO 2 in aqueous mixtures of known composition of diethanolamine (DEA) with methyldiethanolamine (MDEA) and DEA with 2-amino-2-methyl-1-propanol (AMP) have been obtained in the CO 2 partial pressure range 3–3000 kPa. The data for DEA–MDEA solutions were obtained at 313.15 K and are reported at four different compositions: 10 wt.% DEA–15 wt.% MDEA, 10 wt.% DEA–20 wt.% MDEA, 20 wt.% DEA–10 wt.% MDEA and 10 wt.% DEA–35 wt.% MDEA, data for the solution of 10 wt.% DEA–20 wt.% MDEA were also obtained at 393.15 K. The data for DEA–AMP solutions were obtained at 313.15 and 373.15 K and are reported at two different compositions: 25 wt.% DEA–5 wt.% AMP and 20 wt.% DEA–10 wt.% AMP. The results are given as the partial pressure ( p ) of CO 2 against its mole ratio α (mol CO 2 /mol alkanolamine), in the range of temperature studied. The solubility of CO 2 in all the studied systems decreases with an increase in temperature and increases with an increase in the partial pressure of CO 2 , at a given temperature, and it is a strong function of the composition of the blend of alkanolamines in solution. The aqueous mixture with 10 wt.% AMP, at 313.15 K, shows higher capacity to absorb CO 2 than any of the other mixtures studied here. From the experimental solubility results, exothermic values of the enthalpy of solution, Δ H s , were derived.

Desulfurization of Middle Distillates by Oxidation and Extraction Process

Abstract In this work, we studied the desulfurization of Straight Run Gas Oil (SRGO) and diesel by selective oxidation and extraction of sulfur-containing compounds. The oxidation was carried out with a mixture of hydrogen peroxide at 30 wt% and acetic acid as catalyst. The extraction of the corresponding sulfones was performed with polar solvents (e.g., acetonitrile, methanol, 2-ethoxyethanol, and γ-butyrolactone). The SRGO has a sulfur content of 13,985 ppmw while diesel has 390 ppmw, the results showed sulfur removal to levels as low as 92 ppmw for diesel. From a consideration of the above results, a preliminary estimation of investment for a desulfuration process for hydrotreated diesel was done.

Gas solubility of hydrogen sulfide and carbon dioxide in mixtures of sulfolane with diethanolamine at different temperatures

Abstract Murrieta-Guevara, F., Rebolledo-Libreros, E. and Trejo, A., 1994. Gas solubility of hydrogen sulfide and carbon dioxide in mixtures of sulfolane with diethanolamine at different temperatures. Fluid Phase Equilibria , 95: 163-174. Experimental equilibrium solubility data are reported for hydrogen sulfide in mixtures of tetramethylene sulfone (sulfolane) with 15, 30 and 50wt.% diethanolamine, and for carbon dioxide in a mixture of sulfolane with 50 wt.% diethanolamine in the temperature range 303.15–373.15 K from 15 up to 2296 kPa of solute partial pressure. The results of the gas solubility measurements are presented as a partial pressure of the solute against its mole fraction in the solvent mixture, and also against its mole ratio with respect to diethanolamine. For a given temperature, the solubility of either solute increases as the pressure increases. The solubility of the hydrogen sulfide increases as the concentration of diethanolamine increases. Exothermic values of the enthalpy of solution for hydrogen sulfide and carbon dioxide were obtained from solubility data.

Gas solubility of carbon dioxide and hydrogen sulfide in mixtures of sulfolane with monoethanolamine

Murrieta-Guevara, F., Rebolledo-Libreros, E. and Trejo, A., 1993. Gas solubility of carbon dioxide and hydrogen sulfide in mixtures of sulfolane with monoethanolamine. Fluid Phase Equilibria, 86: 225-231 The equilibrium solubility of carbon dioxide and hydrogen sulfide in mixtures of tetra-methylene sulfone (sulfolane) with 15 and 30wt.% monoethanolamine was determined experimentally in the temperature range 303.15–373.15 K from 2 to 2210 kPa of partial pressure. The results of the gas solubility measurements are presented as partial pressure of the solute against its mole fraction in the solvent. Values of the enthalpy of solution for carbon dioxide and hydrogen sulfide were derived from the solubility data.

Volumes of mixing ofn-alkanenitriles withn-alkanes: Interpretation through the Prigogine-Flory-Patterson theory

We present in this work the results of measurements of excess volumes of mixing VE at 30°C over the whole composition range for sixteen mixtures of n-hexanenitrile, n-octanenitrile, n-decanenitrile, and n-dodecanenitrile mixed individually with n-heptane, n-decane, n-tridecane, and n-hexadecane. The experimental values of VE show a regular pattern of behavior for the four sets of binary systems. In each group of mixtures for a given n-alkanenitrile, the magnitude of VE decreases as the n-alkane chain-length decreases. For mixtures containing a common n-alkane, VE decreases with increasing n-alkanenitrile chain-length. In order to explain the observed behavior, we have used the Prigogine-Flory-Patterson theory, which divides VE into three different contributions. The agreement between the theoretical and experimental VE is reasonable for the systems studied.

Gas solubilities of carbon dioxide and hydrogen sulfide in sulfolane and its mixtures with alkanolamines.

Abstract Gas solubilities of carbon dioxide and hydrogen sulfide have been measured in mixtures of sulfolane with monoethanolamine and diethanolamine at 303.15 K in the pressure range 14 to 2040 kPa. The experimental results are reported as partial pressure of CO 2 or H 2 S against its mole fraction in the liquid phase.

Surface tension of isomers of pure hydrocarbons: a method for estimation and prediction

Abstract A new method to estimate and predict surface tension in the full liquid-state temperature range for isomers of pure hydrocarbons has been developed. The method requires as input parameters the surface tension value corresponding to the linear or normal member of a given hydrocarbon homologous series, modified by an empirical parameter here proposed for each isomer under study. This in turn is calculated using molar volume and solubility parameter values for both the normal and the isomer hydrocarbon. This new method was used to calculate surface tension values for 56 isomers of n -alkane and four isomers of the 1-alkene homologous series in the range 253–373 K. The average error obtained from a comparison between experimental and calculated surface tension values for 497 points of the 60 isomers considered was only 1.5%. The developed method may also be used to obtain surface tension data with high reliability above and below the temperature range for which experimental data are available for both normal and isomer hydrocarbons.

Solubility of propane and butane in mixtures of n-alkanes

Abstract The solubility of propane and n-butane has been determined at 25°C in the following mixtures of normal alkanes: C8 + C14, C8 + C15, C9 + C13, C10 + C13 and C12 + C15. Results were also obtained at 50°C in the following mixtures: C8 + C14 and C12 + C15. Values of the Henrys law constant as a function of composition were derived from the solubility data. The Corresponding States Principle was used to predict Henrys constants obtaining very good agreement for all the systems studied.

GAS-LIQUID PRESSURE-TEMPERATURE-COMPOSITION CRITICAL LOCI FOR N-BUTANENITRILE WITH C5 TO C11 N-ALKANES

Gas—liquid critical pressure and critical temperature were determined experimentally throughout the composition range for the seven binary systems comprising the n-alkanes from n-pentane through n-undecane with n-butanenitrile as a common component. Some of these mixtures are known to form a positive azeotrope at temperatures below the normal boiling temperature, and the presence of a minimum temperature in the p—T and T—x critical loci of some of the mixtures indicates that the homogeneous azeotrope is also present in the critical region. Incidentally, experimental vapour pressures are also reported for n-butanenitrile.