Solubility Of Ethylene Research Articles

Selectivities of Carbon Dioxide over Ethane in Three Methylimidazolium-Based Ionic Liquids: Experimental Data and Modeling.

This work focused on the solubility of ethane in three promising ionic liquids {1-Hexyl-3-methylimidazolium bis(trifluormethylsulfonyl) imide [HMIM][Tf2N], 1-Butyl-3-methyl-imidazolium dimethyl-phosphate [BMIM][DMP], and 1-Propyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)-imide [PMIM][Tf2N]}. The solubilities were measured at 303.15 K to 343.15 K and pressures up to 1.4 MPa using a gravimetric microbalance. The overall ranking of ethane solubility in the ionic liquids from highest to lowest is the following: [HMIM][Tf2N] > [PMIM][Tf2N] > [BMIM][DMP]. The Peng-Robinson equation of state was used to model the experimental data using three different mixing rules: van der Waals one, van der Waals two, and Wong-Sandler mixing rules combined with the Non-Random Two-Liquid model. The average absolute deviations for the three mixing rules for the ionic liquids at the three temperatures were 4.39, 2.45, and 2.45%, respectively. Henry's Law constants for ethane in [BMIM] [DMP] were the highest (lowest solubility) amongst other ionic liquids studied in this work. The solubility ranking for the 3 ILs was confirmed by calculating their overall polarity parameter (N) using COSMO-RS. The selectivity of CO2 over C2H6 was estimated at three temperatures, and the overall ranking of the selectivity was in the following order: [PMIM][Tf2N] > [BMIM][DMP] > [HMIM][Tf2N] > Selexol. Selexol is an efficient and widely used physical solvent in gas sweetening. It has lower selectivity than the three ionic liquids studied. [PMIM][Tf2N], a promising solvent, has the highest selectivity among the three ILs studied and would, therefore, be the best choice if, in addition to carbon dioxide capture, ethane co-absorption was to be avoided. The enthalpy and entropy of solvation at infinite dilution were also estimated.

Solubilities of Ethylene and Carbon Dioxide Gases in Lithium-Ion Battery Electrolyte.

During Li-ion battery operation, (electro)chemical side reactions occur within the cell that can promote or degrade performance. These complex reactions produce byproducts in the solid, liquid, and gas phases. Studying byproducts in these three phases can help optimize battery lifetimes. To relate the measured gas-phase byproducts to species dissolved in the liquid-phase, equilibrium proprieties such as the Henry's law constants are required. The present work implements a pressure decay experiment to determine the thermodynamic equilibrium concentrations between the gas and liquid phases for ethylene (C2H4) and carbon dioxide (CO2), which are two gases commonly produced in Li-ion batteries, with an electrolyte of 1.2 M LiPF6 in 3:7 wt/wt ethylene carbonate/ethyl methyl carbonate and 3 wt % fluoroethylene carbonate (15:25:57:3 wt % total composition). The experimentally measured pressure decay curve is fit to an analytical dissolution model and extrapolated to predict the final pressure at equilibrium. The relationship between the partial pressures and concentration of dissolved gas in electrolyte at equilibrium is then used to determine Henry's law constants of 2.0 × 104 kPa for C2H4 and k CO2 = 1.1 × 104 kPa for CO2. These values are compared to Henry's law constants predicted from density functional theory and show good agreement within a factor of 3.

Propylene and DME solubility in PAG oil: Experimental investigations and simplified modeling

This work experimentally investigated the solubility of Propylene and Dimethyl Ether (DME) in polyalkylene glycol (PAG) oil. The solubility experimental data were used to fit different local composition models from the literature, the Wilson and Heil equations, and the Non-Random Two-Liquid (NRTL) model. Two new empirical correlations were proposed to decrease the deviation between experiments and the models. The first correlation used six fitting coefficients and resulted in an average deviation of 1.2 % for Propylene and 2.8 % for DME. The second empirical correlation was proposed with a single solubility coefficient (SSC) and a compact form, which allows solubility to be determined explicitly. The correlation resulted in average deviations from experimental data of 1.6 % for Propylene and 2.5 % for DME. Moreover, the SSC correlation showed performance robustness against the decrease of available data points. The correlation was used to compare the solubility of Propylene and DME with the solubility of Propane. At the same conditions, Propane showed the lowest solubility while DME resulted in the most soluble refrigerant.

Experimental study on the dissolution characteristics of ethane into oil‐based mud in complex oil and gas wellbore environments

AbstractAccurately determining the solubility of ethane in oil‐based mud is crucial for assessing the severity of gas kicks and implementing appropriate well control procedures. The key factors influencing the solubility of ethane gas in oil‐based drilling fluids include the content of base oil, pressure, temperature, and the viscosity of the drilling fluid. This study aims to test the solubility of high‐purity ethane in oil‐based mud under simulated downhole conditions in a 5000 m deep well. The test covers a temperature range of 40–140°C and a partial pressure range of 0.17–5.92 MPa. The effects of temperature, pressure, base oil content, and drilling fluid viscosity on the solubility of ethane are analyzed using various experimental data processing methods. The results show that the variation in ethane solubility with pressure and temperature is nearly linear within the specified ranges. Furthermore, the impact of pressure (1.24–2.78%/MPa) on solubility is approximately 50 times greater than that of temperature (−0.013 to −0.049%/°C) in oil‐based drilling mud. Additionally, ethane's solubility decreases as the drilling fluid's viscosity increases. The ethane solubility in 80% and 90% oil‐based muds is roughly 1.6 times and 2.0 times higher than in 70% oil‐based mud under the same testing conditions. Models for predicting ethane solubility have been developed using screening procedures and statistical regression. These models can be incorporated into gas–liquid flow models to analyze flow behavior during gas kicks.

Catalytic making of ethylene‐1‐hexene elastomers: Thermodynamic guide to process development

AbstractEthylene‐alpha olefin elastomers have versatile applications. Solution copolymerization makes them, using ethylene and alpha olefin‐rich comonomer feed and metallocene and postmetallocene precatalysts, at laboratory and industry conditions. Hence, this study models ethylene solubility in toluene‐1‐hexene and n‐hexane‐1‐hexene mixtures using VLE criterion, Peng–Robinson EoS, vdW1f mixing rule, and Shulgin's activity coefficient‐Henry's constant formalism. Levenberg–Marquardt algorithm, with initial conditions comprising quasi‐ideal K factor correlation and Tait liquid phase EoS, solved the model equations. This eliminates present cumbersome literature approach. The predicted solubilities well match the experimental values at all temperature and pressure. Ethylene solubility correlates the liquid phase fluid compressibility to the corresponding catalyst active center residential environment. This offers a new approach to investigate catalyst and copolymerization phenomena and develop ethylene‐1‐hexene elastomer process. Evaluating copolymerization and microstructural property, using ethylene solubility ignoring that in 1‐hexene, introduces significant errors. The present work corrects them and solves a long‐standing polymer reaction engineering problem.

Extraction and Characterization of Watermelon (Citrullus lanatus) Seed Oil

This study focuses on employing solvent extraction to extract and characterize watermelon (Citrullus lanatus) seed oil. The physicochemical properties of the oil were investigated to assess its potential applications in the food, cosmetic, and pharmaceutical industries. The extraction process yielded an oil content of 43%. The oil exhibited a pH value of 4.02, refractive index of 1.452 at 25 °C, and specific gravity of 0.934 at 15 °C. The boiling point, cloud point, flash point, and melting point of oil were determined as 326 °C, 7.3 °C, 289 °C, and 2 °C, respectively. The oil's viscosity was measured as 0.04072 Pa.s, and it demonstrated a non-sooty flame nature and solubility in ether. The free fatty acid contents and acid value were determined at 3.339 % and 6.678 mg KOH/g, respectively. The saponification value (S.V) and iodine value (I.V.) were 147.6315 mg/KOH/g and 88.526 mg Iodine/g, respectively. Additionally, peroxide value was 16.40 meq peroxide/g, and the oil exhibited a congealing temperature range of -14 °C to 22 °C. The oil's retention factor during chromatography was determined as 1.6 cm. Fourier-transform infrared (FTIR) analysis revealed the presence of functional groups such as hydroxyl, amine, aliphatic hydrocarbon, carbonyl, carbon-nitrogen bond, and sulfoxide groups in the oil. These findings suggest that the presence of functional groups, such as hydroxyl, amine, aliphatic hydrocarbon, carbonyl, carbon-nitrogen bond, and sulfoxide groups in watermelon oil, indicate its potential suitability for a wide range of applications in the food, cosmetic, and pharmaceutical industries.

Measurements and modeling of dimethyl ether (DME) solubility in n-decane and DME-saturated liquid density at T = (293.15–393.15) K and P = (0.345–2.76) MPa

Measurements and modeling of dimethyl ether (DME) solubility in n-decane and DME-saturated liquid density at T = (293.15–393.15) K and P = (0.345–2.76) MPa

Insights into the Absorption of Hydrocarbon Gases in Phosphorus-Containing Ionic Liquids.

The solubility of ethane, ethylene, propane, and propylene was measured in two phosphorus-containing ionic liquids, trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate, [P6,6,6,14][DiOP], and 1-butyl-3-methylimidazolium dimethylphosphate, [C4C1Im][DMP], using an isochoric saturation method. The ionic liquid [C4C1Im][DMP] absorbed between 1 and 20 molecules of gas per 1000 ion pairs, at 313 K and 0.1 MPa, while [P6,6,6,14][DiOP] absorbed up to 169 molecules of propane per 1000 ion pairs under the same conditions. [C4C1Im][DMP] had a higher capacity to absorb olefins than paraffins, while the opposite was true for [P6,6,6,14][DiOP], with the former being slightly more selective than the later. From the analysis of the thermodynamic properties of solvation, we concluded that in both ionic liquids and for all of the studied gases the solvation is ruled by the entropy, even if its contribution is unfavorable. These results, together with density measurements, 2D NMR studies, and self-diffusion coefficients suggest that the gases' solubility is ruled mostly by nonspecific interactions with the ionic liquids and that the looser ion packing in [P6,6,6,14][DiOP] makes it easier to accommodate the gases compared to [C4C1Im][DMP].

Effects of Polymerization Medium on Nascent UHMWPE Properties and Sintered Material Performance

High-performance and easy-processing UHMWPE products with less entanglement and small particle size are difficult to synthesize efficiently in the polymerization process. In this study, a mixture of heptane and light paraffin is proposed as the polymerization medium to control the concentration of ethylene in the slurry during polymerization. Influences of the mixture composition on the polymerization behavior of ethylene, the particle size and its distribution of nascent UHMWPE, and the initial entangled state of UHMWPE were explored. Experimental results showed that as the volume fraction of heptane decreased, the viscosity of the solvent mixture increased exponentially, and ethylene solubility as well as mass transfer coefficient of ethylene in solvent decreased, which greatly affected the ethylene polymerization rate. By adjusting the volume fraction of heptane in the polymerization medium, the particle size, initial entanglement state density, and molecular weight of nascent UHMWPE will be coordinately controlled. UHMWPE with smaller particle size, lower entanglement density, and higher molecular weight can be prepared using the conventional Ziegler–Natta catalyst and polymerization medium with a lower heptane content, and its sintered UHMWPE material shows good mechanical properties.

The in situ synthesis of weakly entangled ultrahigh‐molecular‐weight polyethylene/polyethylene wax blends and its synergetic disentanglement effect on LLDPE reinforcement

AbstractHigh‐performance ultrahigh‐molecular‐weight polyethylene (UHMWPE)/low‐molecular‐weight polyethylene (PE) mixture additives were proven to be effective for enhancing commercial high‐density polyethylene (HDPE) resins, which were synthesized by the complicated dual‐site immobilized catalyst system. In this paper, PE wax components were preadded in the polymerization reactor for in situ synthesizing the UHMWPE/PE wax binary blends with just a single SiO2/MgCl2 supported Z–N catalyst modified by the active site isolators. The influence of PE wax addition on the catalytic activity, molecular weight, thermodynamic property, particle size, and entanglement density was systematically researched. It was evidenced that the catalytic activity and molecular weight exhibit a linear relationship with the ethylene solubility caused by the PE wax addition. Besides, the competition between chain propagation/crystallization balance and PE wax long chains entanglement effect arising from the PE wax addition leads to the minimum entanglement density (GNt = 0.59) of UHPE‐20%. The disbalance of chain propagation rate and chain crystallization rate can be broken by PE particle fragmentation, inducing rapidly increased entanglements. Furthermore, with the synergistic disentanglement influence of reduced entanglements for UHMWPE and the chain diffusion ability for PE wax, the LU‐30 sample with a mixture of UHPE‐30% and linear low‐density polyethylene (LLDPE) exhibits the optimum strength/stiffness/toughness properties. The tensile strength, Young's modulus, and impact strength of LU‐30 reach 18.2 MPa (+4%), 172.1 MPa (+53.8%), 60.5 kJ/m2 (+13.1%), respectively, compared with those of pure LLDPE. The overall enhanced mechanical properties are attributed to the intensive signal intensity and tightly stacked form of shish‐kebab structures, which were verified by the two‐dimensional small angle X‐ray scattering and two‐dimensional wide angle X‐ray diffraction patterns. In addition, the in situ polymerization method of UHMWPE/PE wax with SiO2/MgCl2 supported Z–N catalysts exhibits a great probability of efficient utilization of low‐molecular‐weight polyethylene by‐products (PE wax).

Depolymerization of Kraft lignin into liquid fuels over a WO3 modified acid-base coupled hydrogenation catalyst

Lignin depolymerization to prepare valuable liquid fuels and phenolics is an important route to improve its efficient utilization, whereas some intractable challenges remain on account of the recalcitrant three-dimensional structure and the depolymerized intermediates are apt to condensation. Although some catalysts can work on lignin model compounds, the depolymerization rate is unable to compete effectively with the condensation reaction in the actual lignin depolymerization process. Based on this, the selective adsorption and activation of the C-O and C–C bonds, as well as the stabilization of depolymerization intermediates are essential to achieving efficient lignin depolymerization. Herein, a novel W-modified acid-base coupled hydrogenation catalyst was reported for the effective lignin conversion to generate liquid fuels. The Lewis acid sites WOx and TiO2 as well as the base sites MgO were favorable for adsorption and polarization of C–C and C-O bonds, promoting the cleavage of C–C and C-O bonds, while the hydrogenation site NiO activated the H2 molecular and inhibits the condensation reaction of reactive intermediates. Thereby, the cleavage of C-O and C–C bonds was facilitated by selective hydrodeoxygenation, leading to enhanced yields in petroleum ether solubilities and monomers. After reacting at 300 °C for 24 h, 63.03% petroleum ether solubles yield (mainly monomers and dimers) and 21.56% monophenol yield obtained with the HHV increased from 25.41 MJKg−1 to 33.90 MJKg−1, and the reusability was accredited.

Interactions of C2H6 and C2H4 with the homologous series [CnMIM][BF4] ionic liquids at high pressure studied by in situ ATR-FTIR spectroscopy

It is believed that ionic liquids (IL) can be a promising sorbent for separating a mixture of olefins and paraffins due to their unique properties. Understanding the interaction between IL and sorbed gases plays a key role in the development of selective separation processes. In this work, for the first time, in situ ATR-FTIR spectroscopy was used to study the interaction of light hydrocarbons (C2H6, C2H4) and a series of 1-alkyl-3-methylimidazolium tetrafluoroborate [CnMIM][BF4] (n = 2, 4, 6, 8, 10, 12) ILs. The spectra of liquid ethane and ethylene were obtained, as well as the spectra of IL under the pressure of hydrocarbons. An increase in the length of the alkyl chain of the cation leads to an increase in the solubility of both ethane and ethylene. The data obtained demonstrate a significant interaction between ethylene and IL, which leads to a greater dissolution of ethylene relative to ethane. A blue-shift of the bands of sorbed ethylene relative to liquid ethylene is observed. At the same time, an increase in the length of the alkyl chain of the cation leads to a shift in the wavenumber of sorbed ethylene towards lower wavenumbers, which is the result of a decrease in the interaction between IL and ethylene and the dissolution of ethylene in the free volume of IL. In addition, it has been found that it is possible for two hydrogen atoms of ethylene to interact to form a hydrogen bond between the anion of the IL and ethylene.

Standard Industries Holdings to Acquire Grace

The density, viscosity and absorption of ethane and ethylene were determined experimentally, as a function of temperature and at atmospheric pressure, in different imidazolium-based ionic liquids: 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl)imide, [C1C8Im][NTf2], 1-methyl-3-(propyn-3-yl)imidazolium bis(trifluoromethanesulfonyl)imide [C1(C2H2CH)Im][NTf2], 1-(3-cyanopropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C1C3CNIm][NTf2], 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide [C1C3CNIm][DCA], 1-butyl-3-methylimidazolium dicyanamide, [C1C4Im][DCA] and 1-butyl-3-methylimidazolium methylphosphite [C1C4Im][C1HPO3]. The densities and viscosities of the ionic liquids studied are strongly dependent on the anion and, at 313 K, follow the order: [C1(C2H2CH)Im][NTf2] > [C1C3CNIm][NTf2] > [C1C3CNIm][DCA] > [C1C4Im][C1HO3] > [C1C4Im][DCA] and [C1C3CNIm][NTf2] > [C1C3CNIm][DCA] > [C1C4Im][C1HPO3] > [C1(C2H2CH)Im][NTf2] > [C1C4Im][DCA], respectively. The differences in the molecular structures of the ionic liquids allowed the identification of the influence of increasing the alkyl side chain of the cation, of the presence of unsaturated CC and CN bonds on the alkyl side chain of the cation and finally of a phosphite based anion on the selective absorption of ethane and ethylene. The solubility of ethylene is higher than that of ethane in the ionic liquids studied and varies from 18.41 × 10−3 in [C1C8Im][NTf2] at 303.17 K to 1.603 × 10−3 in [C1C4Im][DCA] at 343.61 K. The introduction of the different functional groups leads to a decrease on the gas absorption compared with that of [C1C8Im][NTf2] but to an increase of the ideal separation selectivity of ethane and ethylene.

Characterization of 14-Crown-4 Ethers for the Extraction of Lithium from Natural Brines: Synthesis, Solubility Measurements in Supercritical Carbon Dioxide, and Thermodynamic Modeling

Improving lithium mining methods is key to furthering lithium’s use as an energy metal. Current mining methods from brines are slow and inefficient and have significant environmental impacts, providing an avenue of research toward developing more effective and less environmentally damaging methods. Supercritical fluid extraction has been evaluated in earlier research for the extraction of metals such as uranium, mercury, and several alkali and earth alkaline metals from aqueous solutions but not for lithium. This study documents the synthesis and preliminary testing of two lithium extractants for possible application in a supercritical carbon dioxide fluid extraction process to recover lithium from natural brines. Based on their high solubility in supercritical carbon dioxide and their desirable structural properties, two 14-crown-4 ethers with different functional groups were selected. In this work, solubility measurements and thermodynamic modeling were carried out to characterize their solubility behavior in the range of P = 100–300 bar with T = 60 °C and T = 85 °C. The main conclusion from this work is the experimental observation of sufficiently high solubilities of the synthesized crown ethers in supercritical carbon dioxide. The highest measured solubility of M14C4, the nonfluorinated 14-crown-4 ether, was 0.30 mol/L at 60 °C and 205 bar, and the highest measured solubility of F14C4, the fluorinated 14-crown-4 ether, was 0.27 mol/L at 60 °C and 285 bar. Another major conclusion was the observed higher solubility of M14C4 than F14C4. We also showed that equation of state modeling provides insight into the factors affecting the crown ether solubility in supercritical carbon dioxide.

Solubility of ethylene in N-methyl-2-pyrrolidone: Experimental study and estimation of UNIQUAC activity model parameters

The solubility of ethylene in N-methyl-2-pyrrolidone (NMP) was evaluated at different temperatures, including 278.2, 298.2, and 328.2 K, and different pressures in an experimental pressure decaying setup. The kinetic and equilibrium results were obtained for pure gas absorption. Henry’s law constants were calculated at different temperatures. Eventually, thermodynamic modeling was done using Peng Robinson equation of state (PR-EOS) and UNIQUAC activity coefficient model. The binary interaction parameters, τ12, τ21, were adjusted and optimized. Regarding the values obtained for binary interaction parameters, it was concluded that this solution has non-ideal behavior. Indeed, because of its low prediction error (3–11%), it was concluded that the correlated thermodynamic model could accurately predict the experimental data.

A novel approach for the estimation of the Sanchez-Lacombe interaction parameters for the solubility of ternary polyolefins systems

The total solubility of ethylene in LLDPE in presence of propane, isobutane and 1-butene is measured using a gravimetric technique at 70 °C and pressures up to 5 bars. In order to overcome the lack of experimental partial solubility data in ternary systems, a novel approach for the estimation of the Sanchez-Lacombe interaction parameters is proposed. The total solubility measurements combined with the independent estimate of the compressibility factor for a mixture of gases using Peng-Robinson EoS as a second “data source” were fitted to SL EoS in order to identify its interaction parameters. This makes it possible to calculate individual component solubility data for the two penetrants in a non-ideal ternary system where the third phase is polyethylene. The observed trends were theoretically interpreted because no available data can be found in the literature for these studied systems. Good agreement was observed between the experimental overall solubility and SL EoS combined to PR EoS, with a difference of 1–4% for the overall solubilities and a maximum of 0.8% for the compressibility factor.

Intensification of ethylene and ethane absorption in N-methyl-2-pyrrolidone (NMP) by adding silver nanoparticles

The absorption and solubility of pure ethane and ethylene gases were investigated in an experimental pressure decay setup, where a small amount of silver nanoparticles was added to pure N-methyl-2-pyrrolidone (NMP) solvent. All the experiments were performed at temperatures of 278.15, 298.15 and 328.15 K and different pressures (up to the gases dew points) as well as different concentrations of silver nanoparticles (0.05 and 0.1 g/l). The kinetic data of absorption, Henry’s law constants, heat of absorption, entropy, Gibbs free energy, and ideal selectivity were reported. Also, the effects of temperature, pressure, and nanoparticle concentration on the equilibrium results were evaluated. The absorption results revealed that the presence of small amounts of nanoparticles in the solvent intensified the absorption performance between 1.5–18 % for ethylene and 1–41 % for ethane. The results also showed that the solubility of ethylene in pure solvent and nanofluids was better than that of ethane. Increasing the nanosilver concentration up to 0.1 g/l resulted in reducing the absorption equilibrium time specially for ethylene/nanofluid experiments. Also, the ideal ethylene/ethane selectivity improved by increasing the nanoparticle concentration at the same temperature.

Regulating the monomers composition ratio inside the particle nanodomains with induced condensing agent and its impact on particle growth

Induced Condensing Agent (ICA) is commonly employed to enhance heat removal of olefin polymerization in gas phase fluidized bed. It is well known that ICA significantly promotes the instantaneous rate of ethylene polymerization and improves the solubility of ethylene, but little is known about the effect of ICA on regulating olefin monomers composition ratio in the nanodomains of polypropylene particles and the particle growth. In this work, we investigated this matter by adjusting the concentration of ICA during the copolymerization stage of impact polypropylene. This method can alter the monomers composition ratio in the polypropylene particles effectively, which, in succession, provides a systematic study on the effect of particle growth. Here we demonstrated that the propylene/ethylene ratio in polypropylene particles rose with addition of ICA. However, the particle size analysis suggested the existence of ICA caused the biomodal size distribution, indicating that the condensation of ICA required an essential pressure gradient length about 250–500 μm. Differential EPR distribution between the surface and internal of the particle provided novel perspectives for producing HIPP with high rubber content. This work also offered new insight into the condensed mode cooling olefin copolymerization process.

Effect of silver nanoparticles on the solubility of methane and ethane in water

In this work, the solubility of methane and ethane were studied in aqueous dispersion of silver nanoparticles (1, 5, and 10 ppm) at temperatures of 1, 2.5, 10, and 11.5 °C for methane and 2.5, 5, 10, 15.5 °C for ethane and at initial pressures 1 to 5.5 and 0.35–2.15 MPa for methane and ethane, respectively. The nanoparticles were synthesized and characterized through UV–vis spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM) image. The results demonstrated that silver nanoparticles increased the solubility of methane and ethane up to 13 and 16% compared with pure water, respectively. The solubility of methane and ethane were enhanced by increasing the nanoparticles mass loading. The effect of nanoparticles on ethane solubility was more significant than methane solubility.

Experimental study and thermodynamic modelling of ethylene absorption in N-methyl-2-pyrrolidone (NMP)

Determining the solubility of gases in solvents and considering non-idealities at different operating conditions are essential to design a cost-effective and energy-efficient absorption process. In this work, using a lab-made set-up, solubility of ethylene in N-methyl-2-pyrrolidone (NMP) was measured at different temperatures (278.15, 298.15, and 328.15 K) and pressures up to 14 bar, and the kinetic and equilibrium data were obtained. Accordingly, Henry’s law constants are calculated at various temperatures. Then, thermodynamic modeling was accomplished by applying Peng-Robinson equation of state (PR-EOS) and Wilson activity coefficient model, and the binary interaction parameters were estimated. By the thermodynamic modeling, positive deviation from ideal behavior was apparently observed. Due to low absolute average deviation of < 7.7%, the correlated model was able to predict the ethylene solubility in NMP with a reliable accuracy.