{"title":"Solubilities of Ethylene and Ethane in CuAlCl4 + Toluene Solutions","authors":"Radmehr Omidi, Saeed Ovaysi","doi":"10.1007/s10953-026-01659-0","DOIUrl":"10.1007/s10953-026-01659-0","url":null,"abstract":"<div><p>A double salt solution of CuAlCl<sub>4</sub> in toluene is found to absorb ethylene in much higher quantities compared to ethane. Experimental data for solubilities of ethylene and ethane in CuAlCl<sub>4</sub> + toluene solutions are obtained over a wide range of temperatures and pressures. The solubilities are measured in a stirred tank at several CuAlCl<sub>4</sub> concentrations. The temperature and pressure ranges, i.e., 293–353 K and 2–10 bar, are chosen to cover the possible operating conditions of the absorption/desorption towers at industrial scales. Based on the experimental data, the VLE K-values are determined and used to calculate selectivity of ethylene absorption over that of ethane. A thermodynamic model is then proposed based on the experimental data. It is found that ethylene selectivities of the absorbent increases by increasing temperature, decreasing pressure, and increasing CuAlCl<sub>4</sub> concentration.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":"55 10","pages":"2877 - 2894"},"PeriodicalIF":1.3,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yongliang Xiong, Vanessa Mercado, Scott Wood, Yifeng Wang, Guangping Xu
{"title":"Gibbsite Solubility Measurements in NaOH + NaNO3 Solutions at 60 °C, and a Thermodynamic Model for Interactions of Aluminate Ion (Al(OH)4–) with Nitrate","authors":"Yongliang Xiong, Vanessa Mercado, Scott Wood, Yifeng Wang, Guangping Xu","doi":"10.1007/s10953-026-01653-6","DOIUrl":"10.1007/s10953-026-01653-6","url":null,"abstract":"<div><p>The interactions of aluminate ion (Al(OH)<sub>4</sub><sup>−</sup>) with nitrate are important to numerous fields including nuclear waste management, and extraction of aluminum from bauxite ores. In the field of nuclear waste management, aluminum (Al) is a prevalent component in tank waste sludge phase at various sites, and accounts for high percentages of the total inventory of tank waste sludge. Three predominant Al-bearing solid phases are sodium aluminate [NaAl(OH)<sub>4</sub>], gibbsite [α-Al(OH)<sub>3</sub>], and boehmite. Nitrate and nitrite have high concentrations in the supernatant liquids. Therefore, the knowledge of the interactions of aluminum with nitrate and nitrite is important to the realization of a scientifically sound and effective pretreatment approach for tank waste sludge. To gain a deeper knowledge of such interactions, we are conducting systematic experiments coupled with the thermodynamic modeling. In this work, we report our solubility measurements at 60 °C. Based on our experimental data, we develop a thermodynamic model to describe the interactions of aluminate ion with nitrate. Then, the thermodynamic model is tested against the experimental data of gibbsite in mixtures of NaOH and NaNO<sub>3</sub> from the literature. Those literature data are not utilized in the model development. The tests show that the values predicted by the model are in good agreement with the experimental data that are independent from the model development.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":"55 10","pages":"2857 - 2876"},"PeriodicalIF":1.3,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Micellar and Thermodynamic Study of CPC and SDBS in the Presence of an Anionic Antibiotic Drug Cloxacillin Sodium: A Temperature and Drug Concentration Effect","authors":"Ashwani Kumar Sood, Meenu Aggarwal","doi":"10.1007/s10953-026-01668-z","DOIUrl":"10.1007/s10953-026-01668-z","url":null,"abstract":"<div><p>A study on the micellar and thermodynamic properties of drug-surfactant mixtures is of significant importance in order to achieve optimum therapeutic action of a drug. Therefore, herein, the micellar characteristics of cationic surfactant cetylpyridinium chloride (CPC) as well as anionic surfactant sodium dodecylbenzene sulfonate (SDBS) have been evaluated with the help of conductance measurements in the presence of cloxacillin sodium (CS), an anionic antibiotic drug, at various temperatures ranging from 288.15 to 313.15 K with a step size of 5.0 K. The results indicate that with the increase in the drug concentration, the critical micelle concentration (<i>CMC</i>) of CPC increases continuously, although a decrease in <i>CMC</i> at higher drug concentration (from 2.5 to 10.0 mmol·dm<sup>−3</sup>) has been observed in case of SDBS. The dissimilar behavior of the two surfactants has been explained on the basis of charges on the head groups and the molecular structure of the drug CS. The variation in <i>CMC</i> for both the surfactants shows a non-linear trend with the increase in temperature and exhibits a U-shaped behavior in case of aqueous and aqueous drug solutions. The values of enthalpy of micellization (∆<i>H</i><sup>o</sup><sub>m</sub>) and entropy of micellization (∆<i>S</i><sup>o</sup><sub>m</sub>) indicate that drug-surfactant interactions show endothermic behavior (∆<i>H</i><sup>o</sup><sub>m</sub> > 0) at low temperatures and become exothermic (∆<i>H</i><sup>o</sup><sub>m</sub> < 0) at higher temperatures. The process of micellization has mostly been entropically favored as evidenced from <i>T</i>∆<i>S</i><sup>o</sup><sub>m</sub> > ∆<i>H</i><sup>o</sup><sub>m</sub>.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":"55 10","pages":"2842 - 2856"},"PeriodicalIF":1.3,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Kinetics and Reactivity Correlation in Diol Oxidation by Tetramethyl-\u0000Ethylenediammonium Dichromate Across Acetic Acid–Water Compositions","authors":"Dinesh Panday","doi":"10.1007/s10953-026-01655-4","DOIUrl":"10.1007/s10953-026-01655-4","url":null,"abstract":"<div><p>The present investigation focuses on the oxidation kinetics of four vicinal diols, four non-vicinal diols, and one monoether by tetramethyl-ethylenediammonium dichromate (TMEDADC) in water–acetic acid mixtures of different molar ratios. All the selected diols resulted in the formation of corresponding hydroxyaldehyde as a main product of the oxidation. The reaction follows first-order kinetics with respect to TMEDADC and shows a fractional order (between 1 and 2) in diol concentration. Oxidation of [1,1,2,2- <sup>2</sup>H<sub>4</sub>] ethane diol exhibits a noticeable primary kinetic isotope effect (<i>k</i><sub>H</sub>/<i>k</i><sub>D</sub> = 5.58 at 298 K). A strong linear correlation is observed between the rate constants for vicinal diols and the Taft polar substituent constants (Σσ*), and the negative polar reaction constant (ρ* = − 2.19 at 298 K) indicates the development of an electron-deficient center in the rate-determining step. A plausible process involving the pre-equilibrium generation of chromate ester has been postulated.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":"55 10","pages":"2827 - 2841"},"PeriodicalIF":1.3,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}