scholarly journals Chalcones: A Solubility Study at Different Temperatures

2014 ◽  
Vol 31 ◽  
pp. 7-19
Author(s):  
Ankita A. Bhalu ◽  
Kapil D. Bhesaniya ◽  
Nayan J. Vekariya ◽  
Shipra H. Baluja
Keyword(s):  
Gravimetric Method ◽  
Aromatic Aldehydes ◽  
Solubility Study ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Aryl Ketones ◽  
Different Temperatures ◽  
Experimental Solubility Data ◽  
Hoff Equation ◽  
Structure In Solution

Some new chalcones are synthesized by the condensation of aryl ketones with aromatic aldehydes and solubility of these synthesized chalcones is determined in chloroform and dichloromethane at temperatures ranging between 293.15 K and 313.15 K by gravimetric method. The experimental data was correlated well with modified Apelblat equation. Further, from the experimental solubility data, some thermodynamic parameters such as dissolution enthalpy, Gibb’s energy and entropy etc. were evaluated using van’t Hoff equation. The positive Gibb’s energy and negative entropy suggests spontaneous dissolution and more ordered structure in solution.

Solubility and Thermodynamic Properties of L-Proline in Methanol-Dichloromethane Mixtures

2015 ◽  
Vol 775 ◽  
pp. 185-190
Author(s):  
Zi Dan Chen ◽  
Kun Kun Wang ◽  
Xue Li ◽  
Sheng Wang ◽  
Sha Wu ◽  
...  
Keyword(s):  
Dynamic Method ◽  
Binary Solvents ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Purification Process ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Monitoring Technique ◽  
Laser Monitoring ◽  
Hoff Equation

The solubility of L-proline in binary solvents of methanol and dichloromethane were measured by a dynamic method via a laser monitoring technique. In the binary solvent mixtures, the solubility increases with the increasing of temperature and proportion of the methanol. The experimental solubility were fitted to modified Apelblat equation and Van’t Hoff equation in this work can be used as essential data and models in the purification process of L-proline. The dissolving process is endothermic and the dissolution driving force converts from enthalpy-driving to entropy-driving.

scholarly journals Measurement and Correlation for Solubility of Some Pyrimidine Derivatives in Different Solvents

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Kapil Bhesaniya ◽  
Shipra Baluja
Keyword(s):  
Atmospheric Pressure ◽  
Solubility Data ◽  
Dissolution Enthalpy ◽  
Mass Spectral Data ◽  
Pyrimidine Derivatives ◽  
Mass Spectral ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Experimental Solubility Data ◽  
Experimental Solubility

Some new pyrimidine derivatives have been synthesized and their characterization was done by IR, NMR, and mass spectral data. The solubility of these synthesized compounds has been studied in methanol, N,N dimethylformamide (DMF), and carbon tetrachloride (CCl4) by gravimetrical method from 298.15 to 328.15 K under atmospheric pressure and the solubility data were correlated against temperature. The solubility is found to increase with temperature and order of solubility is DMF > methanol > CCl4. The experimental solubility data is correlated with the modified Apelblat equation. Some thermodynamic parameters such as dissolution enthalpy, Gibbs energy of dissolution, and entropy of mixing have also been calculated.

Metal-Free Photocatalysts C3N3S3 and its Polymers: Solubility in Water and Application in Benzylic Alcohols Oxidation Under Visible Light

NANO ◽  
2017 ◽  
Vol 12 (08) ◽  
pp. 1750101 ◽  
Author(s):  
Liming Chen ◽  
Lulu Zhao ◽  
Jie Xu ◽  
Jinlin Long ◽  
Linxi Hou
Keyword(s):  
Visible Light ◽  
Aerobic Oxidation ◽  
Oxidation Activity ◽  
Solubility In Water ◽  
Metal Free ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Polymer Solubility ◽  
Different Temperatures ◽  
Increasing Temperature

Metal-free photocatalysts trithiocyanuric acid (C3N3S[Formula: see text] and its polymers were one-step synthesized and used for selective aerobic oxidation of benzyl alcohol under visible light. The S–S bridged C3N3S3 polymers showed higher oxidation activity with increasing polymerization time and reached a maximum at 40[Formula: see text]h. As a major factor, catalysts’ solubility in water at different temperatures (from 298.15[Formula: see text]K to 368.15[Formula: see text]K) was measured at atmospheric pressure. The obtained data were correlated by polynomial empirical equation and modified Apelblat equation, respectively. Experimental results proved that the solubility of C3N3S3 and its polymers increased with increasing temperature. The solubility of C3N3S3 polymers with lower polymerization degree (DP) were better than that of parent C3N3S3 owing to the hydrophilicity caused by a low symmetry and disorder structure, whereas the higher DP could lead to the decrease of polymer solubility and further affect the photocatalytic activity. Thermodynamic properties of the solution system including the enthalpy ([Formula: see text] and heat capacity ([Formula: see text]) were calculated by the modified Apelblat equation.

Solubility study of ketoconazole in the mixtures of N-methyl-2-pyrrolidone and ethanol at different temperatures

2021 ◽  
pp. 115287
Author(s):  
Milad Moradi ◽  
Elaheh Rahimpour ◽  
Hongkun Zhao ◽  
Fleming Martinez ◽  
Abolghasem Jouyban
Keyword(s):  
Solubility Study ◽  
Different Temperatures

scholarly journals Correlation and prediction of solubility of hydrogen in alkenes and its dissolution properties

2021 ◽  
Author(s):  
Mohammad Jamali ◽  
Amir Abbas Izadpanah ◽  
Masoud Mofarahi
Keyword(s):  
Equation Of State ◽  
Binary Interaction ◽  
Absolute Deviation ◽  
Dissolution Properties ◽  
Different Temperatures ◽  
Binary Interaction Parameters ◽  
Delta G ◽  
Hoff Equation ◽  
Increasing Temperature ◽  
Total Average

AbstractIn this work, solubility of hydrogen in some alkenes was investigated at different temperatures and pressures. Solubility values were calculated using the Peng–Robinson equation of state. Binary interaction parameters were calculated using fitting the equation of state on experimental data, Group contribution method and Moysan correlations and total average absolute deviation for these methods was 3.90, 17.60 and 13.62, respectively. Because hydrogen solubility in Alkenes is low, Henry’s law for these solutions were investigated, too. Results of calculation showed with increasing temperature, Henry’s constant was decreased. The temperature dependency of Henry’s constants of hydrogen in ethylene and propylene was higher than to other alkenes. In addition, using Van’t Hoff equation, the thermodynamic parameters for dissolution of hydrogen in various alkenes were calculated. Results indicated that the dissolution of hydrogen was spontaneous and endothermic. The total average of dissolution enthalpy ($${\Delta H}^{^\circ }$$ Δ H ∘ ) and Gibbs free energy ($${\Delta G}^{^\circ }$$ Δ G ∘ ) for these systems was 3.867 kJ/mol and 6.361 kJ/mol, respectively. But dissolution of hydrogen in almost of alkenes was not an entropy-driven process.

Solubility study of mesalazine in the aqueous mixtures of a deep-eutectic solvent at different temperatures

2021 ◽  
pp. 116300
Author(s):  
Aynaz Zarghampour ◽  
Milad Moradi ◽  
Fleming Martinez ◽  
Salar Hemmati ◽  
Elaheh Rahimpour ◽  
...  
Keyword(s):  
Deep Eutectic Solvent ◽  
Aqueous Mixtures ◽  
Solubility Study ◽  
Different Temperatures

Measurement and Correlation of Solubilities and Surface Tension of Caffeine in Water

2012 ◽  
Vol 560-561 ◽  
pp. 28-34
Author(s):  
Zhao You Zhu ◽  
Da Wei Zhang ◽  
Ying Long Wang
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Induction Time ◽  
Balance Method ◽  
Empirical Equations ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Calculated Solubility ◽  
The Relationship

The solubility of caffeine in water between 323.15 and 353.15 K was measured using the balance method. The solubility trend was modeled by use of the modified Apelblat equation and Yaws equation. The calculated solubility values according to the two empirical equations compare favorably with the experimental data. Besides, the relationship between supersaturated ratio and induction time was studied with the method of laser, basing on which, the surface tension of caffeine at 283.15 K, 293.15 K and 298.15 K in water was calculated.

scholarly journals Thermal and moisture adsorption/desorption properties for a selection of vegetal insulation materials

2019 ◽  
Vol 282 ◽  
pp. 02062
Author(s):  
Staņislavs Gendelis ◽  
Andris Jakovičs ◽  
Max Engelhardt
Keyword(s):  
Thermal Conductivity ◽  
Gravimetric Method ◽  
Insulation Materials ◽  
Ecological Aspects ◽  
Rye Straw ◽  
Different Temperatures ◽  
Relative Humidity Range ◽  
The Difference ◽  
Agricultural Materials ◽  
Adsorption Desorption

Natural, or ‘green’ insulation materials, have become more popular for the ‘ecologisation’ of construction activities. The ecological aspects for such materials are being widely analysed, but experimental data about their physical properties when installed in building constructions remains lacking. In this study, pressed samples of three locally wild grown agricultural materials – rye, reed, and hemp – are analysed. Thermal conductivity measurements were carried out using the hot plate device. Comparison with widely used mineral insulation materials shows that thermal conductivity for simple pressed materials are roughly three times higher, and are comparable to plywood and cross-laminated timber insulation properties. Additional experiments regarding such materials include measurements of hygroscopic sorption properties (adsorption/desorption), determined using the dynamic gravimetric method at different temperatures and a wide, relative humidity range. The results obtained show that the difference in all studied materials appeared only at high humidity values; the rye straw and reed spikelets adsorbed more water than other materials, which is important for potential indoor air humidity assessment.

scholarly journals Determination of the Solubility, Dissolution Enthalpy, and Entropy of Icariin in Acetone, Acetoacetate, Chloroform, and Light Petroleum

2020 ◽  
Vol 15 (11) ◽  
pp. 1934578X2097149
Author(s):  
Jiao Xie ◽  
Kanghuai Zhang ◽  
Haitao Wang ◽  
Xin Yang ◽  
Wenbin Mao ◽  
...  
Keyword(s):  
Light Petroleum ◽  
Solubility Data ◽  
Dissolution Enthalpy ◽  
Visible Spectrophotometry ◽  
Solubility Behavior ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Enthalpy And Entropy ◽  
The Difference

The solubility of icariin in acetone, acetoacetate, chloroform, and light petroleum in the 283.2‐318.2 K range was measured by ultraviolet-visible spectrophotometry. As the temperature increased, the solubility of icariin in the 4 solvents gradually increased. The solubility data correlated with the modified Apelblat equation. The dissolution enthalpy and entropy of icariin were determined using van’t Hoff plots. The dissolution enthalpy and entropy of icariin in the 4 solvents increases as acetone >acetoacetate >chloroform >light petroleum, which can be explained by the difference of the polarity indices between them. The polarity indices of the solvents affect the solubility behavior.

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