Solubility of Itaconic Acid in Aqueous Ethanol Mixtures from 278.15 K to 333.15 K

Data on corresponding solid?Cliquid equilibrium of itaconic acid in binary aqueous ethanol solutions are essential for industrial design and further theoretical studies. Using the analytical stirred-flask method, the solubility of itaconic acid in pure water solvent and mixed solvents were measured over the temperature range from 278.15 to 333.15 K at atmospheric pressure. The effect of solvent composition and temperature on the solubility is discussed. The solubility data were correlated with the Combined Nearly Ideal Binary Solvent/Redlich (CNIBS/R-K) model. The solubility measured in this study can be used for the itaconic acid purification or optical resolution by the preferential crystallization procedure.     

Ultrasonic Studies in Binary Mixtures of 1-2-Dibromoethane with Alcohols at 303.15 K

Abstract

Isentropic compressibility data, K_S of 1,2-Dibromoethane + Propan-1-ol, + butan-1-ol, + pentan-1-ol, hexan-1-ol, heptan-1-ol and octan-1-ol at 303.15 K are reported. Deviations in isentropic compressibility, K_S values are found to be negative for mixtures of 1,2-dibromoethane with propan-1-ol over the entire range of composition and while in butan-1-ol the δK_S values are negative at lower molefractions and positive at higher molefractions. Therefore as the chain length increases it is showing the positive deviations. The data are interpreted in terms of specific interactions between the components.     

Meloxicam Solubility in Ethanol+Water Mixtures According to the Extended Hildebrand Solubility Approach

In this work the extended Hildebrand solubility approach (EHSA) was applied to evaluate the solubility of the analgesic drug meloxicam in ethanol+water mixtures at 298.15 K. An acceptable correlative capacity of EHSA was found using a regular polynomial model in fifth order (overall deviation 0.52 %), where the W interaction parameter is related to the solubility parameter of the co-solvent mixtures. Nevertheless, the deviations obtained in the estimated solubility with respect to experimental solubility were similar to those obtained directly by means of an empirical regression of the logarithm of the experimental solubility as a function of the same polarity index (near to 0.51 %).     

Solubility of 1,3,3-Trinitroazetidine in Ethanol + Water Systems from (293.15 K to 323.15 K)

The solubilities of 1,3,3-trinitroazetidine, TNAZ, in pure solvent and mixed solvents were measured using a synthetic method. The laser monitoring technique was used to determine the disappearance of the solid phase in a solid + liquid mixture. All data were measured at atmospheric pressure and temperatures ranging from (293.15 to 323.15) K. The effect of solvent composition and temperature on the solubility was discussed. The experimental data were correlated with an empirical equation.     

Solubility of 1-Amino-4-Hydroxyanthraquinone in Water-Amide Mixtures

The solubility of a C.I. Disperse Red 15 dye in water and concentrated aqueous solutions of urea and acetamide was studied by isothermal saturation within the 313-353 K temperature range The thermodynamic characteristics of the dye solution were calculated, and the results were analyzed.     

Excess Volumes of Binary Mixtures of Benzene + 1-Alkanols at 303.15 K

Abstract

Excess molar volumes V^E of binary mixtures of benzene + 1-propanol, + 1-butanol, + 1-pentanol, + 1-hexanol, + 1-heptanol, + 1-octanol, + 1-nonanol and 1-decanol were measured at 303.15 K. The V^E values are positive over the entire range of composition for these mixtures. The results are discussed in terms of intermolecular interactions.     

四元体系H3BO3-MgSO4-MgCl2-H2O在273.15K的溶解度等温线

作者考察了H₃BO₃-MgSO₄-MgCl₂-H₂O四元体系在273.15±0.05K温度下的溶解度等温线。四元体系共饱和点的液相组成为33.44%(重量)MgCl₃,1.77%MgSO₄和0.65%H₃B0₃。     

Excess Volumes of Ternary Mixtures Containing N-Methylcyclohexylamine,Benzene with 1-Alkanols at 303.15 K

Abstract

New excess volume data have been measured for three ternary mixtures at 303.15 K. The mixtures included N-methylcyclohexylamine and benzene as common components. 1-propanol, 1-butanol and 1-pentanol were chosen as non-common components. The data were compared with those predicted by empirical relations. The experimental results have been analysed in terms of intermolecular interactions between unlike molecules.     

三元体系LiCl-LiNO3-H2O 273.15 K和323.15 K等温溶解度的测定

Solubility of the ternary system LiCl-LiNO₃-H₂O was measured at 273.15 K and 323.15 K by analyzing the equilibrated phase composition. Experimental result shows that there are three solubility branches at 273.15 K, corresponding to the solid phases LiCl·2H₂O，LiNO₃ and LiNO₃·3H₂O, respectively, while there are two solubility branches at 323.15 K, corresponding to the solid phase LiCl·H₂O and LiNO₃. The invariant point compositions are (1) 33.68wt% LiCl, 14.32wt% LiNO₃ and (2) 27.70wt% LiCl, 20.60wt% LiNO₃ at 273.15 K and (3) 39.07wt% LiCl, 16.89wt% LiNO₃ at 323.15 K. Also, the experimental results show that the solid phases in equilibrium with the solution {x(2.8LiCl+LiNO₃)-(1-x)H₂O} are LiNO₃·3H₂O or LiNO₃ at 273.15 K and LiNO₃ at 323.15 K.     

Solubility of methane in octane + ethanol at temperatures from 303.15 K to 333.15 K and pressures up to 12.01 MPa

Solubility of methane in octane + ethanol was measured at temperatures ranging from 303.15 K to 333.15 K and pressures ranging from 2.60 MPa to 12.01 MPa. Experimental data were analyzed using the Soave-Redlich-Kwong equation of state with three types of mixing rules, and the estimated average deviation from the experimental solubility data was less than 3.5 %.     

Solubility of Trans-Stilbene in Binary Alcohol + 1-Propanol Solvent Mixtures at 298.2 K

Abstract

Experimental solubilities are reported for trans-stilbene dissolved in six binary alcohol + 1-propanol solvent mixtures at 25°C. The alcohol cosolvents studied were 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 1-pentanol and 3-methyl-1-butanol. Results of these measurements are used to test two mathematical representations based upon the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister and Modified Wilson equations. For the six systems studied, the Combined NIBS/Redlich-Kister equation was found to provide the better mathematical representation of the experimental data, with overall average absolute deviations between measured and calculated values being approximately ±0.4%. Slightly larger deviations were noted in the case of the Modified Wilson equation.     

1-(4-叔丁基苯基)-1,1-二[4-(4-硝基苯氧基)\]苯基乙烷的合成及其溶解性研究

以叔丁基苯为起始原料,经3步反应制得了一种新化合物1-(4-叔丁基苯基)-1,1-二[4-(4-硝基苯氧基)]苯基乙烷（3）,总收率61.14%,其结构经¹H NMR和IR表征。3可溶于非极性溶剂（石油醚除外）和极性非质子溶剂。     

Solubility of Trans-Stilbene in Binary Alkane + 1-Butanol Solvent Mixtures at 298.2 K

Abstract

Experimental solubilities are reported for trans-stilbene dissolved in six binary alkane + 1-butanol solvent mixtures at 25°C. The alkane cosoivents studied were hexane, heptane, octane, cyclohexane, methylcyclohexane and 2,2,4-trimethylpentane. Results of these measurements are used to test two mathematical representations based upon the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister and Modified Wilson equations. For the six systems studied, the Combined NIBS/Redlich-Kister equation was found to provide the better mathematical representation of the experimental data, with overall average absolute deviations between measured and calculated values being approximately ±0.6%. Slightly larger deviations were noted in the case of the Modified Wilson equation.     

Solubility of Trans-Stilbene in Binary Alkane + 1-Propanol Solvent Mixtures at 298.2 K

Abstract

Experimental solubilities are reported for trans-stilbene dissolved in six binary alkane + 1-propanol solvent mixtures at 25°C. the alkane cosolvents studied were hexane, heptane, octane, cyclohexane, methylcyclohexane and 2,2,4-trimethylpentane. Results of these measurements are used to test two mathematical representations based upon the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister and Modified Wilson equations. for the six system studied, the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister equation provided the better mathematical representation of the experimental data, with an overall average absolute deviation between measured and calculated values being approximately 0.4%. Slightly larger deviations were noted in the case of the Modified Wilson equation.     

Solubility of Anthracene in Binary Alcohol + 1-chlorobutane Solvent Mixtures at 298.2 K

Abstract

Experimental solubilities are reported for anthracene dissolved in six binary alcohol + 1-chlorobutane solvent mixtures at 25°C. The alcohol cosolvents studied were 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol and 3-methyl-1-butanol. Results of these measurements are used to test a mathematical representation based upon the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister equation. For the six systems studied, the Combined NIBS/Redlich-Kister equation was found to mathematically describe the experimental data, with overall average absolute deviations between measured and calculated values being approximately\pm 0.4%.     

Temperature Dependence of the Solubility of Acetaminophen in Propylene Glycol + Ethanol Mixtures

The thermodynamic functions Gibbs energy, enthalpy and entropy of solution, mixing and solvation of acetaminophen in propylene glycol (PG) + ethanol (EtOH) cosolvent mixtures were evaluated from solubility data measured at several temperatures, using the van't Hoff and Gibbs equations. The solubility was greater at 50% m/m of PG at 20.0^C, while it was greater at 80% of PG at 40.0 ^C where m/m refers to mass percent. The solvation of this drug is appreciably greater in the mixtures than in the pure solvents. By means of an enthalpy–entropy compensation analysis, complex behavior was found for the solution. From 0 up to 20% of PG and from 60 up to 100% of PG the solution process is enthalpy driven, whereas from 20 up to 60% of PG it is entropy driven. These facts can be explained in terms of a decrease in the energy required for cavity formation in the solvent for mixtures containing 20–60% of PG.