Solubilities of carbon dioxide,hydrogen sulfide and sulfur dioxide in physical solvents

Solubilities expressed by Henry's law constants for carbon dioxide, hydrogen sulfide and sulfur dioxide in four physical solvents (propylene carbonate, N-formyl morpholine, Selexol, and methyl cyanoacetate) have been measured at several temperatures ranging from 25°C to 70°C, using gas-liquid chromatography. Thermodynamic properties including enthalpies and entropies of solution have been derived from the solubility data.     

Solubility of H2S in n-hexadecane at elevated pressure

The solubility of H₂S in n-hexadecane has been determined at 50, 100 and 150°C at pressures up to 7.4 MPa. The results were correlated with the Peng-Robinson (1976) equation of state and Henry's constants were derived for comparison with low pressure data in the literature.     

Solubilities of Carbon Dioxide in Polyethylene Glycol Ethers

New extensive data are reported for the solubility of carbon dioxide in fourteen physical solvents, and compared to two other solvents widely used in industry (selexol® and sulfolane). The solubility data are expressed by Henry's law constants and have been measured at 25 °C, 40 °C and 60 °C, using an Autoclave cell. The study concludes that polyethylene glycol dimethyl ethers, and mixtures of these solvents are the best solvents for CO₂ removal.     

Solubility of N2O and CO2 in n-Dodecane

The solubility of CO₂ and N₂O in a physical solvent, n-dodecane [C.A. Registry N° 124–18–5], has been measured at 40, 80 and 120°C at pressures up to 9.6 MPa. The experimental results were correlated by the Peng-Robinson (1976) equation of state, and the interaction parameters, the Henry's constants and the N₂O analogy parameters were obtained.     

The solubility of methane in aqueous solutions of monoethanolamine,diethanolamine and triethanolamine

The solubility of methane in 3 kmol/m³ solutions of monoethanolamine, diethanolamine, and triethanolamine was measured from 25° to 125°C and pressures up to about 13 MPa. Measurements were also made for the solubility of methane in water at 25° to 125°C and pressures up to 18 MPa in order to confirm the accuracy of the experimental technique. It is demonstrated that methane is more soluble (in terms of mole fraction) in the amine solution than in pure water. Furthermore, the solubility is an increasing function of the size of the alkanolamine. The solubility data were modeled using a Henry's-law approach and the results summarized in terms of salting-in coefficients.     

Solubility of CO2 in three cellulose-dissolving ionic liquids

The solubility of CO₂ in three cellulose-dissolving ionic liquids (1-ethyl-3-methylimidazolium diethylphosphate, [Emim][DEP], 1-allyl-3-methylimidazolium chloride, [Amim][Cl], and 1-butyl-3-methylimidazolium chloride, [Bmim][Cl]) at temperatures within 298 and 356 K and pressures up to 6.5 MPa was determined using a Van Ness-type apparatus (static isochoric). It was demonstrated that this device can work in isothermal and isoplethal modes, being the latter faster and more precise. Moreover, it was possible to determine CO₂ solubilities in metastable liquid [Bmim][Cl]. Experimental data were modeled using the Extended Henry's law correlation and the group contribution equation of state. New parameters for the binary interaction of CO₂ with ionic liquid groups were calculated.     

Prediction of Henry's law constants by matrix completion

Methods for predicting Henry's law constants H_ij are important as experimental data are scarce. We introduce a new machine learning approach for such predictions: matrix completion methods (MCMs) and demonstrate its applicability using a data base that contains experimental H_ij values for 101 solutes i and 247 solvents j at 298 K. Data on H_ij are only available for 2661 systems i + j. These H_ij are stored in a 101 × 247 matrix; the task of the MCM is to predict the missing entries. First, an entirely data-driven MCM is presented. Its predictive performance, evaluated using leave-one-out analysis, is similar to that of the Predictive Soave-Redlich-Kwong equation-of-state (PSRK-EoS), which, however, cannot be applied to all studied systems. Furthermore, a hybrid of MCM and PSRK-EoS is developed in a Bayesian framework, which yields an unprecedented performance for the prediction of H_ij of the studied data set.     

气相色谱法测定吗啉、N-甲酰吗啉及其杂质含量

提出了用HP-5毛细管色谱柱测定在萃取液中吗啉、N-甲酰吗啉及其杂质含量的分析方法，研究了其测定条件，并对分离后的组分用质谱方法进行了定性，按照确定的分析条件，对甲乙酮原料萃取剂中各组分都得到较好的分离，精密度好，分析结果准确可靠。     

The solubility of ethane in n-methylpyrrolidinone

The solubility of ethane in N-methylpyrrolidinone (NMP) has been measured at ?10, 25, 40, 50, 70, 75, 100, and 120°C at pressures up to 7.1 MPa. The solubility data obtained are compared with those of ethane in other physical solvents. The results were correlated with the Peng-Robinson (1976) equation of state and the interaction parameters were obtained. Henry's constants were also determined.     

Simple three parameter equations for correlating liquid phase compositions in subcritical and supercritical systems

Two Chrastil type expressions have been developed to model the solubility of supercritical fluids/gases in liquids. The three parameter expressions proposed correlates the solubility as a function of temperature, pressure and density. The equation can also be used to check the self-consistency of the experimental data of liquid phase compositions for supercritical fluid–liquid equilibria. Fifty three different binary systems (carbon-dioxide + liquid) with around 2700 data points encompassing a wide range of compounds like esters, alcohols, carboxylic acids and ionic liquids were successfully modeled for a wide range of temperatures and pressures. Besides the test for self-consistency, based on the data at one temperature, the model can be used to predict the solubility of supercritical fluids in liquids at different temperatures.     

The solubility of ethane in triethylene glycol monomethyl ether

The solubility of ethane in triethylene glycol monomethyl ether (TEGMME) has been measured at 40, 70 and 100°C at pressures up to 9.2 MPa. The solubility data obtained are compared with those of ethane in other physical solvents. The results were correlated with the Peng-Robinson (1976) equation of state and the interaction parameters were obtained. Henry's constants were also determined.     

The solubility of HFC125, HFC134a,HFC143a and HFC152a in n-eicosane,n-hexadecane,n-tridecane and 2, 6, 10, 14-tetramethylpentadecane

The solubility of 1, 1, 1, 2,2-pentafluoroethane (HFC125), 1, 1, 1, 2-tetrafluoroethane (HFC134a), 1, 1, 1-trifluoroethane (HFC143a) and 1,1-difluoroethane (HFC152a) in four well-known hydrocarbons have been measured at temperatures between 293.15 and 363.15 K and pressures between 0.05 and 2 MPa. Henry's constant, and the activity coefficient for HFCs at infinite dilution, have been derived for measurements below 0.28 MPa. The measurements were made with an isochoric method and their uncertainty is less than 2% for Henry's constant and less than 3% at high pressure. For several mixtures, the experimental data have been correlated with the UNIQUAC method and binary interaction parameters have been derived, resulting in a deviation from the data of less than 4%.     

The solubility of CO2 in triethylene glycol monomethyl ether

The solubility of CO₂ in triethylene glycol monomethyl ether (TEGMME) has been measured at 40, 70 and 100°C at pressures up to 8.8 MPa. The results were correlated with the Peng-Robinson (1976) equation of state. The interaction parameters and Henry's constants were derived.     

Solubility measurements of N2 and CO2 in polypropylene and ethene/octene copolymer

In this set of experiments a magnetic suspension balance (MSB) was employed to measure the apparent solubilities of N₂ and CO₂ in polypropylene (PP) and ethene/octene copolymer melts, while the swollen volume predicted by the Sanchez–Lacombe (SL) equation of state (EOS) was used to account for the buoyancy effect. The swollen volume of the polymer/gas mixture, as well as the gas solubilities for both PP and the ethene/octene copolymer, are discussed. It was observed that the branched molecular structure limited the molecular movement, and therefore the volume swelling of the polymer/gas mixture. In a similar context, the solubility of both N₂ and CO₂ were less in the branched polymer (ethene/octene copolymer) than in the linear PP. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2945–2953, 2007     

Design and construction of an equipment for the determination of solubility of gases in liquids

This article presents the design and construction of a new isochoric saturation apparatus for the determination of gas solubility in liquids based on the gas drop pressure method. The major improvement of this design is the separation between the solubility and the gas cells. With this separation, the change of pressure and temperature inside the system is minimum when the gas gets in contact with the liquid and it allows degassing the liquid in an easy way. The performance of the equipment was evaluated measuring the solubility of argon and nitrogen in pure water at 283.15, 288.15, 293.15, and 298.15 K. The gas solubility was calculated according to the Henry's law. The results obtained and the comparison with literature values show that the equipment provides an accurate and precise method for determination of gas solubility in water. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3105–3109, 2017     

The solubility of HCFC22, CFC114 and HFC152A in n-hexadecane

The solubilities of chlorodifluoromethane (HCFC22), 1, 2-dichlorotetrafluoroethane (CFC114) and 1,1-difluoroethane (HFC 152a) in n-hexadecane have been measured at temperatures between 303. 15 and 343. IS K and Henry's constants have been derived. The measurements were made with two different methods, a GLC method and an isochoric method. In general the results of the methods differ less than their combined margin of error, which is estimated to be less than 5% for the GLC method and less than 2% for the isochoric method.     

Screening ionic liquids as candidates for separation of acid gases: Solubility of hydrogen sulfide,methane, and ethane

The solubility of the major constituents of natural gas in ionic liquids (ILs) can be used to identify their potential for acid gas removal from a producing gas stream. We have developed models for the solubility of H₂S, CH₄, and C₂H₆ in ILs at typical conditions encountered in natural gas treatment. In this work, a conductor‐like screening model for realistic solvation was used to predict the activity coefficients for solutes in ILs and a cubic EOS was used for vapor‐phase corrections from ideality. Empirical correlations were developed to extrapolate solubilities where experimental data are not available at desired conditions; targeted in this study at 298.15 K and 2000 kPa. Over 400 possible ILs were ranked based on the higher selectivity of absorption of CO₂ and H₂S over CH₄ and C₂H₆. The best 15% (58) of promising ILs for sour gas treatment predominantly contain the anions BF₄, NO₃, and CH₃SO₄ and the cations N₄₁₁₁, pmg, and tmg. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2993–3005, 2013     

微量气体吸收器的改进及溶解度测定

本工作对Schorlander和Douglas的微量气体吸收器从结构和操作方法上加以改进,使其不仅保持了试剂用量少、测量迅速、精确、操作简便的特点,而且扩大了所适用的溶剂范围,并可应用于混合溶剂系统。用此装置测定了氢气在丙酮+水+MIBK三元混合溶剂中,25～55℃的溶解度数据,取得了满意的结果。     

Prediction of solubility of hydrogen in petroleum cuts using modified unifac

The solubility of hydrogen in different crude oil fractions was estimated using the modified UNIFAC group contribution method. Functional group concentrations were estimated from suggested group model structures. An optimization technique was carried out on critical properties to test the group model structure. The validity of this approach was verified by comparing the predicted and experimental hydrogen solubilities. The experimental hydrogen solubilities were measured by means of pulse response techniques.