Solubility of Propylene in Aqueous Silver Nitrate

Cho, I. H.; Cho, D. L.; Yasuda, H. K.; Marrero, T. R.

doi:10.1021/je00017a023

Cited by 22 publications

(12 citation statements)

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“…For nearly seven decades, the separation of olefins such as ethylene and propylene from refinery catalytic cracker off-gases and effluent streams has been performed by cryogenic distillation which is a highly energy-intensive process. , In the past few years, many researchers have paid attention to developing new alternatives to solve the economic and environmental problems associated to the traditional technology. Among a number of alternatives, the application of reactive absorption using silver salts combined with membrane technology to the separation of C 3 H 8 /C 3 H 6 gas mixtures has been considered a potential alternative to overcome the drawbacks associated to the cryogenic distillation. − The separation performance is mostly associated with the ability of olefins to react selective and reversibly with silver cations Ag + , by a π-complexation mechanism. − Room temperature ionic liquids (RTILs) attract increasing attention as potential substitutes for conventional solvents because in addition to their well-known and remarkable properties such as negligible vapor pressure which allow they to perform gas separations without solvent losses or gas stream pollution, and their high thermal and chemical stability, they present higher affinity for olefinic compounds compared to their corresponding saturated hydrocarbons and at the same time they provide stability to the metal cation dissolved inside. − In addition, they are considered as “designer solvents” since a large number of possible combinations of cations and anions allows for a tunability of their properties to specific applications. Therefore it is possible to select an appropriate ionic liquid for each separation task; however it is critical to have available gas solubility data in ionic liquids with different structures in order to select the most suitable one to carry out the separation process.…”

Section: Introductionmentioning

confidence: 99%

Propylene and Propane Solubility in Imidazolium, Pyridinium, and Tetralkylammonium Based Ionic Liquids Containing a Silver Salt

et al. 2013

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The gas solubility of propane and propylene in seven ionic liquids, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4), 1-hexyl-3-methylimidazolium tetrafluoroborate (HMImBF4), 1-octyl-3-methylimidazolium tetrafluoroborate (OMImBF4), 3-methylimidazolium nitrate (BMImNO3), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonylimide) (BMImTf2N), methyltrioctylammonium bis(trifluoromethylsulfonylimide) (MOOONTf2N), and butyltrimethylammonium bis(trifluoromethylsulfonylimide) (BMMMN Tf2N), is reported. The equilibrium isotherms of both pure gases were measured in the pure ionic liquids and in presence of a silver salt containing the same anion of the ionic liquid in a range of concentration of (0 to 0.77) mol·kgIL –1 at temperatures between (288 and 308) K and pressures ranging from (0 to 700) kPa. Henry’s law constant values for physical solubility as well as the characteristic parameters for chemical solubility such as chemical equilibrium constants and enthalpies of the chemical reactions between silver cations and propylene are reported. Based upon the experimental results, ionic liquids based on imidazolium cations with less and shorter alkyl substituents improve the selective separation of propylene from these mixtures. Regarding to the structure of the anion it was gathered that ionic liquids with the BF4 – anion, combined with the AgBF4 silver salt, provided the best results in terms of olefin capacity and selectivity. In this article we provide valuable data that evidence that the separation of propane/propylene gas mixtures by reactive absorption could represent an efficient alternative to the traditional separation process based on cryogenic distillation and serve for the new process design.

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Section: Introductionmentioning

confidence: 99%

Propylene and Propane Solubility in Imidazolium, Pyridinium, and Tetralkylammonium Based Ionic Liquids Containing a Silver Salt

et al. 2013

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“…Ethylene and acetylene are very important chemical feedstocks for many products in petrochemical industries such as plastics, lubricants, intermediates, polymers, and so on. − Low-temperature distillation, extractive distillation, and physical absorption/adsorption are typical processes for separation of olefins from paraffins , that are expensive, especially for feeds with low fractions of olefins, and they consume large amounts of energy. Chemical absorption/adsorption of olefins with metallic ions such as silver and copper ions can be applied promisingly for separating such gaseous mixtures as those ions have no tendency to absorb paraffins. − However, it is susceptible to deactivate absorbents or adsorbents by feed contaminants; therefore, chemical absorption/adsorption processes may not be acceptable for applications where tight control of the feed composition is impossible . On the other hand, the separation and purification for a mixture of ethylene and acetylene also has practical significance.…”

Section: Introductionmentioning

confidence: 99%

Differential Solubility of Ethylene and Acetylene in Room-Temperature Ionic Liquids: A Theoretical Study

et al. 2012

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The room-temperature ionic liquids (RTILs) have potential in realizing the ethylene (C(2)H(4)) and acetylene (C(2)H(2)) separation and avoiding solvent loss and environmental pollution compared with traditional solvents. The interaction mechanisms between gases and RTILs are important for the exploration of new RTILs for gas separation; thus, they were studied by quantum chemical calculation and molecular dynamics simulation in this work. The optimized geometries were obtained for the complexes of C(2)H(4)/C(2)H(2) with anions (Tf(2)N(-), BF(4)(-), and OAc(-)), cation (bmim(+)), and their ion pairs, and the analysis for geometry, interaction energy, natural bond orbital (NBO), and atoms in molecules (AIM) was performed. The quantum chemical calculation results show that the hydrogen-bonding interaction between the gas molecule and anion is the dominant factor in determining the solubility of C(2)H(2) in RTILs. However, the hydrogen-bonding interaction, the p-π interaction in C(2)H(4)-anion, and the π-π interaction in C(2)H(4)-cation are weak and comparable, which all affect the solubility of C(2)H(4) in RTILs with comparable contribution. The calculated results for the distance of H(gas)···X (X = O or F in anions), the BSSE-corrected interaction energy, the electron density of H(gas)···X at the bond critical point (ρ(BCP)), and the relative second-order perturbation stabilization energy (E(2)) are consistent with the experimental data that C(2)H(2) is more soluble than C(2)H(4) in the same RTILs and the solubility of C(2)H(4) in RTILs has the following order: [bmim][Tf(2)N] > [bmim][OAc] > [bmim][BF(4)]. The calculated results also agree with the order of C(2)H(2) solubility in different RTILs that [bmim][OAc] > [bmim][BF(4)] > [bmim][Tf(2)N]. Furthermore, the calculation results indicate that there is strong C(2)H(2)-RTIL interaction, which cannot be negligible compared to the RTIL-RTIL interaction; thus, the regular solution theory is probably not suitable to correlate C(2)H(2) solubility in RTILs. The molecular dynamics simulation results show that the hydrogen bond between the H in C2 of the imidazolium cation and the anion will weaken the hydrogen-bonding interaction of the gas molecule and anion in a realistic solution condition, especially in the C(2)H(4)-RTIL system.

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“…This paper presents the first measurement of ethylene solubility in aqueous silver nitrate as a function of AgNOg concentration, pressure, and temperature. The technique used in this study of ethylene solubility is essentially the same as that employed in earlier work on propylene (19).…”

Section: Introductionmentioning

confidence: 99%

Solubility of Ethylene in Aqueous Silver Nitrate

Cho¹,

Yasuda²,

Marrero³

1995

J. Chem. Eng. Data

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The solubility of ethylene was measured a t pressures up to 0.64 MPa, at silver nitrate concentrations from 1.0 to 6.0 M, and over a temperature range from 278 to 308 K. From the temperature dependence of the solubility, values were determined for enthalpy and entropy changes. The solubility of ethylene increased with increase in pressure, increase in silver nitrate concentration, and decrease in temperature.The results for the solubility of ethylene in 2.0,4.0, and 6.0 M aqueous silver nitrate at 298 K are in good agreement with the earlier measurements of Hughes and co-workers. The enthalpy and entropy of solution were found to increase with silver nitrate concentrations from 1.0 to 6.0 M; at 1.0 M AgNO3 the enthalpy was -21.9 kJ.mol-I and the entropy was -62.5 Jnol-l*K-l; at 6.0 M AgNO3 the enthalpy was -24.9 kJmo1-I and the entropy was -65.3 J-mo1-l-K-l. The ethylene solubility in aqueous silver nitrate was empirically correlated as a function of system pressure (PI, temperature (T), and silver nitrate concentration (c), and the correlation fits the data with an average error of f8%.

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Solubility of Propylene in Aqueous Silver Nitrate

Cited by 22 publications

References 11 publications

Propylene and Propane Solubility in Imidazolium, Pyridinium, and Tetralkylammonium Based Ionic Liquids Containing a Silver Salt

Propylene and Propane Solubility in Imidazolium, Pyridinium, and Tetralkylammonium Based Ionic Liquids Containing a Silver Salt

Differential Solubility of Ethylene and Acetylene in Room-Temperature Ionic Liquids: A Theoretical Study

Solubility of Ethylene in Aqueous Silver Nitrate

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