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960 Aktuelle Fachpublikationen zum Thema temperature

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Critical Evaluation of the Second Dissociation Constants for Aqueous Sulfuric Acid over a Wide Temperature Range

13.09.2013 | Hannu Sippola, Journal of Chemical & Engineering Data, 2013

The scope of this article is to study the ability of different equations for K2 and different sets of Pitzer parameters to model the thermodynamic properties of the H2SO4–H2O system over a wide temperature range. Three Pitzer parameters are found essential in modeling aqueous sulfuric acid, ...

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Re-evaluation of the Mean Activity Coefficients of Strontium Chloride in Dilute Aqueous Solutions from (10 to 60) °C and at 25 °C up to the Saturated Solution Where the Molality Is 3.520 mol·kg–1

11.09.2013 | Jaakko I. Partanen, Journal of Chemical & Engineering Data, 2013

In the present study, two Hückel equations have been determined for the calculation of the mean activity coefficients of SrCl2 in pure aqueous solutions at 25 °C. The two-parameter equation with parameters B and b1 gives a good fit up to an ionic strength (= Im) of 2.0 mol·kg–1, and the ...

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Binary Diffusion Coefficients of Aqueous Straight-Chain Amino Acids at Infinitesimal Concentration and Temperatures from (298.2 to 333.2) K

10.09.2013 | Kazuko Yui; Yuichiro Noda; Motonobu Koido; Mai Irie; Izumi Watanabe; Tatsuya Umecky; Toshitaka Funazukuri, Journal of Chemical & Engineering Data, 2013

Mutual diffusion coefficients for aqueous solutions of 3-aminopropanoic acid (β-alanine), 4-aminobutanoic acid (γ-aminobutyric acid), 5-aminopentanoic acid, 6-aminohexanoic acid, and 7-aminoheptanoic acid at infinitesimal concentration were measured at atmospheric pressure and temperatures from ...

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Determination and Correlation of Solubilities of (S)-Indoline-2-carboxylic Acid in Six Different Solvents from (283.15 to 358.15) K

04.09.2013 | Jin-Qiang Liu; Xin-Xiang Cao; Baoming Ji; Bangtun Zhao, Journal of Chemical & Engineering Data, 2013

The solubilities of (S)-indoline-2-carboxylilc acid (SIn2CA) in six pure solvents including water, methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol were determined from (283.15 to 358.15) K at atmospheric pressure using the synthetic method. The solubility was determined by a laser ...

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Volumetric, Viscometric, and Refractive Index Behavior of 7-Hydroxy-4-methylcoumarin in Aqueous Ethanol or 1-Propanol Solutions in the Temperature Range of (293.15 to 313.15) K

04.09.2013 | Aiju Chen; Min Liu; Yan Zheng; Dezhi Sun; Bingquan Wang; Liping Wang, Journal of Chemical & Engineering Data, 2013

Densities and viscosities of the pseudo binary system 7-hydroxy-4-methylcoumarin + (ethanol or 1-propanol) + water at temperatures of (293.15, 298.15, 303.15, 308.15, and 313.15) K and refractive indices of this system at T = 298.15 K have been measured as a function of the molality of ...

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Phase Diagram of HCOOK–(NH2)2CO–H2O System

23.08.2013 | Alexander V. Dzuban; Alexey L. Voskov; Irina A. Uspenskaya, Journal of Chemical & Engineering Data, 2013

The temperature and enthalpy of fusion and of the solid-state phase transition in HCOOK were determined by a differential scanning calorimetry (DSC) method. The thermodynamic assessment of the potassium formate–urea–water ternary system and of two binary subsystems was made. The Redlich–Kister ...

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Isobaric Vapor–Liquid Equilibrium for the Binary System of Hexamethyl Disiloxane + Isopropyl Acetate at Atmospheric Pressure

21.08.2013 | Wenlin Zhang; Xiaowen Wang; Nan Meng; Wei Du; Chunli Li, Journal of Chemical & Engineering Data, 2013

Isobaric vapor–liquid equilibrium (VLE) data for the hexamethyl disiloxane + isopropyl acetate system at atmospheric pressure (101.3 kPa) were measured. The thermodynamic consistency of experimental data was checked with the Herrington method. The experimental binary data were correlated with ...

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Phase Equilibria and Phase Diagrams for the Aqueous Ternary System (Na2SO4 + Li2SO4 + H2O) at (288 and 308) K

19.08.2013 | Yafei Guo; Yuanhui Liu; Qin Wang; Chenxiao Lin; Shiqiang Wang; Tianlong Deng, Journal of Chemical & Engineering Data, 2013

The solubility and density of the thermodynamic phase equilibria ternary system (Na2SO4 + Li2SO4 + H2O) at (288 and 308) K were determined using the isothermal dissolution method. According to the experimental results of the ternary system at (288 and 308) K, the phase diagrams and the diagrams ...

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Densities and Viscosities of Binary Mixtures of 2-Butanol + Isobutanol, 2-Butanol + tert-Butanol, and Isobutanol + tert-Butanol from (308.15 to 343.15) K

16.08.2013 | Micael G. Bravo-Sánchez; Gustavo A. Iglesias-Silva; Alejandro Estrada-Baltazar; Kenneth R. Hall, Journal of Chemical & Engineering Data, 2013

This paper presents densities and viscosities for binary mixtures of 2-butanol + isobutanol, 2-butanol + tert-butanol, and isobutanol + tert-butanol at temperatures between (308.15 and 343.15) K over the entire composition range at atmospheric pressure. The experimental apparatus are a vibrating ...

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Effect of Substituent Groups in Anions on Some Physicochemical Properties of 1-Butyl-3-methylimidazolium Carboxylate Ionic Liquids

13.08.2013 | Airong Xu; Yajuan Zhang; Zhiyong Li; Jianji Wang, Journal of Chemical & Engineering Data, 2013

In this work, four 1-butyl-3-methylimidazolium carboxylate ionic liquids (ILs) with different substituent groups in anions, including 1-butyl-3-methylimidazolium glycollate [C4mim][HOCH2COO], 1-butyl-3-methylimidazolium lactate [C4mim][CH3CHOHCOO], 1-butyl-3-methylimidazolium benzoate ...

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