The ethane-1,2-diol–water solvent system. The dependence of the dissociation constant of picric acid on the temperature and composition of the solvent mixture

1988 ◽  
Vol 84 (12) ◽  
pp. 4427 ◽  
Author(s):  
Gian Carlo Franchini ◽  
Andrea Marchetti ◽  
Lorenzo Tassi ◽  
Giuseppe Tosi
Keyword(s):  
Dissociation Constant ◽  
Picric Acid ◽  
Solvent System ◽  
Solvent Mixture ◽  
Water Solvent

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

1991 ◽  
Vol 69 (3) ◽  
pp. 509-517 ◽  
Author(s):  
Andrea Marchetti ◽  
Carlo Preti ◽  
Mara Tagliazucchi ◽  
Lorenzo Tassi ◽  
Giuseppe Tosi
Keyword(s):  
Dissociation Constant ◽  
Picric Acid ◽  
Solvent System ◽  
Solvent Mixture ◽  
Statistical Weight ◽  
Nonaqueous Solvent ◽  
Solvent Mixtures ◽  
Best Fitting ◽  
Complete Form ◽  
Experimental Values

Three empirical equations are proposed to fit the experimental values of the dissociation constant for picric acid, chosen as guide-solute working in the N, N-dimethylformamide/2-methoxyethanol solvent system. The work was performed operating at 19 temperatures ranging from − 10 to + 80 °C in the pure solvents and in their nine mixtures, identified by the mole fraction (X) of one component. This empirical treatment, which describes the dependence of the dissociation constant on temperature and composition of the solvent mixture, is represented by functions of the type K = K(T), K = K(X), and K = K(T, X). The K = K(T, X) equation in its complete form is composed of 20 terms, some of which can be eliminated because of small statistical weight; the number and type of these terms vary on passing from one solvent system to another and the best-fitting form is suggested. A comparison among various K = K(T, X) equations proposed in the present and in previous works has been made. Key words: dissociation equilibria, binary nonaqueous solvent mixtures, picric acid, N,N-dimethylformamide, 2-methoxyethanol.

Ionic equilibria of picric acid in mixed amphiprotic solvents. The 2-methoxyethanol/water solvent system

1989 ◽  
Vol 61 (17) ◽  
pp. 1971-1977 ◽  
Author(s):  
Andrea. Marchetti ◽  
Emanuele. Picchioni ◽  
Lorenzo. Tassi ◽  
Giuseppe. Tosi
Keyword(s):  
Picric Acid ◽  
Solvent System ◽  
Water Solvent ◽  
Ionic Equilibria

Conversion of glucose into furans in the presence of AlCl3 in an ethanol–water solvent system

2012 ◽  
Vol 116 ◽  
pp. 190-194 ◽  
Author(s):  
Yu Yang ◽  
Changwei Hu ◽  
Mahdi M. Abu-Omar
Keyword(s):  
Solvent System ◽  
Water Solvent

Effect of Cellulose Coating on Properties of Cotton Fabric

2016 ◽  
Vol 860 ◽  
pp. 81-84
Author(s):  
Bandu Madhukar Kale ◽  
Jakub Wiener ◽  
Jiri Militky ◽  
Hafiz Shahzad Maqsood
Keyword(s):  
Tensile Strength ◽  
Cotton Fabric ◽  
Solvent System ◽  
Dissolving Pulp ◽  
Cotton Fibers ◽  
Cellulose Solution ◽  
Dyeing Properties ◽  
Sem Micrographs ◽  
Coated Substrate ◽  
Water Solvent

Cellulose solution was used for coating and it was prepared by dissolving pulp cellulose in Urea-Thiourea-NaOH-Water solvent system. Reactive Red 240 dye was used for dyeing the coated as well as control cotton fabric. The effect of cellulose coating on the dyeing properties of cotton fabric was studied by measuring K/S values of the coated substrate at various concentrations of cellulose and dye. K/S value decreased after coating cellulose on the surface of cotton fabric. The lightness of cotton fabric increased after cellulose coating. SEM micrographs revealed that coated cellulose was attached to cotton fibers. Tensile strength increased after cellulose coating.

scholarly journals Pyrolyzing Renewable Sugar and Taurine on the Surface of Multi-Walled Carbon Nanotubes as Heterogeneous Catalysts for Hydroxymethylfurfural Production

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 517 ◽  
Author(s):  
Huiping Ji ◽  
Jie Fu ◽  
Tianfu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Metal Salt ◽  
Textural Properties ◽  
Solvent System ◽  
Hydrothermal Stability ◽  
Transportation Fuels ◽  
Water Solvent ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Conversion of biorenewable feedstocks into transportation fuels or chemicals likely necessitates the development of novel heterogeneous catalysts with good hydrothermal stability, due to the nature of highly oxygenated biomass compounds and the prevalence of water as a processing solvent. The use of carbon-based materials, derived from sugars as catalyst precursors, can achieve hydrothermal stability while simultaneously realizing the goal of sustainability. In this work, the simultaneous pyrolysis of glucose and taurine in the presence of multi-walled carbon nanotubes (MWCNTs), to obtain versatile solid acids, has been demonstrated. Structural and textural properties of the catalysts have been characterized by TEM, TGA, and XPS. Additionally, solid state nuclear magnetic resonance (ssNMR) spectroscopy has been exploited to elucidate the chemical nature of carbon species deposited on the surface of MWCNTs. Al(OTf)3, a model Lewis acidic metal salt, has been successfully supported on sulfonic groups tethered to MWCNTs. This catalyst has been tested for C6 sugar dehydration for the production of HMF in a tetrahydrofuran (THF)/water solvent system with good recyclability.

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