Solid−Liquid Equilibria for Hexanedioic Acid + Benzoic Acid, Benzoic Acid + Pentanedioic Acid, and Hexanedioic Acid + Pentanedioic Acid

2010 ◽  
Vol 55 (12) ◽  
pp. 5797-5800 ◽  
Author(s):  
Tzu-Chi Wang ◽  
Tzu-Yu Lai ◽  
Yan-Ping Chen
Keyword(s):  
Benzoic Acid ◽  
Solid Liquid ◽  
Pentanedioic Acid ◽  
Hexanedioic Acid

scholarly journals Solid-Liquid Equilibria of Benzoic Acid Derivatives in 1-Octanol

2007 ◽  
Vol 15 (5) ◽  
pp. 710-714 ◽  
Author(s):  
Qingzhu JIA ◽  
Peisheng MA ◽  
Shaona MA ◽  
Chang WANG
Keyword(s):  
Benzoic Acid ◽  
Benzoic Acid Derivatives ◽  
Solid Liquid

High pressure–temperature aqueous oxidations. III. A kinetic study of the enolization and oxidation of cyclohexanone

1988 ◽  
Vol 66 (2) ◽  
pp. 294-299 ◽  
Author(s):  
John W. Thomas ◽  
Jay E. Taylor
Keyword(s):  
High Pressure ◽  
Kinetic Study ◽  
Aqueous Media ◽  
Activation Parameters ◽  
Oxygen Molecule ◽  
First Order ◽  
Partial Pressures ◽  
Butanedioic Acid ◽  
Pentanedioic Acid ◽  
Hexanedioic Acid

The rates of enolization of cyclohexanone have been determined at 145 and 172 °C in D2O and with buffers. The rates of oxidation were evaluated at temperatures of 145, 172, and 193.5 °C with oxygen partial pressures of 20.4 to 131 atm. The rate of enolization was 10–160 times faster than the rate of oxidation thereby supporting the previously proposed concept of enol intermediacy for the oxidation of ketones. The oxidation was first order in cyclohexanone and 1/2 order in oxygen. The rate of oxidation was increased by the addition of traditional phenolic inhibitors. The products isolated were formic, acetic, butanedioic, pentanedioic, hexanedioic, and 5-oxohexanoic acids. The activation parameters were calculated to be ΔH≠, 22 kcal/mol; ΔS≠, −27 eu, log A, 7.6 for the oxidation and ΔH≠, 12 kcal/mol; ΔS≠, −42.3 eu, log A, 4.13 for the enolization. Based on these observations a mechanism has been postulated whereby an oxygen molecule forms a transitory adduct with two enolates of cyclohexanone. The latter may then split by a reversible reaction to form an intermediate which may then isomerize or oxidize to either 2-hydroxycyclohexanone or 1,3-cyclohexanedione. Upon further oxidation the former yields hexanedioic acid. The latter then undergoes a reverse condensation in the aqueous media to 5-oxohexanoic acid which upon further oxidation yields formic plus pentanedioic acid and acetic plus butanedioic acid.

scholarly journals Optimization and Validation of an HPLC-UV Method for Determination of Benzoic Acid and Sorbic Acid in Yogurt and Dried-Yogurt Products Using a Design of Experiment

2018 ◽  
Vol 18 (3) ◽  
pp. 522 ◽  
Author(s):  
Ala Yahya Sirhan
Keyword(s):  
Benzoic Acid ◽  
Design Of Experiment ◽  
High Performance ◽  
Sorbic Acid ◽  
Uv Detector ◽  
Column Temperature ◽  
Treatment Processes ◽  
Relative Standard ◽  
Pre Treatment ◽  
Solid Liquid

A method for the determination and analysis of benzoic acid and sorbic acid in yogurt and dried-yogurt products has been developed. This method was based on the use of a simple solid-liquid extraction method, followed by the high-performance liquid chromatography with a UV detector (HPLC–UV), enhanced with the aid of response surface methodology and design of experiment (DOE). The method excludes the use of complicated procedures, time-consuming and labor-intensive pre-treatment processes. Separation of the benzoic acid and sorbic acid with higher selectivity and sensitivity, and within reasonable retention time was performed by using an isocratic mobile phase of acetate buffer (pH 5.6)-methanol 60:40 at a column temperature of 25 °C. Optimization of sample preparation and analytical conditions gave recoveries in the range of 81 to 111% at spike levels of 2–20 mg/L and the relative standard deviations (RSDs) was lower than 9% in all cases. The intra-day precision and inter-day precision results were in the range of 8.4–8.5% and 10.4–11.0%. Additionally, the limits of detection (LOD) were 0.66 and 0.51 mg/L and the limits of quantification (LOQ) were 1.3 and 1.0 mg/L for benzoic acid and sorbic acid, respectively.

Mechanism of solid/liquid interfacial reactions: the dissolution of benzoic acid in aqueous solution

1993 ◽  
Vol 97 (40) ◽  
pp. 10416-10420 ◽  
Author(s):  
R. G. Compton ◽  
M. S. Harding ◽  
M. R. Pluck ◽  
J. H. Atherton ◽  
C. M. Brennan
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Interfacial Reactions ◽  
Solid Liquid

Determination of Solid–Liquid Phase Equilibrium of Benzoic Acid in Mono, Binary, and Ternary Systems and Their Correlation

2020 ◽  
Author(s):  
Kadakanchi Sandeepa ◽  
Tulasi S.V.R. Neeharika ◽  
Ravi Kumar K ◽  
Bankupalli Satyavathi ◽  
Prathap Kumar Thella
Keyword(s):  
Phase Equilibrium ◽  
Liquid Phase ◽  
Benzoic Acid ◽  
Ternary Systems ◽  
Solid Liquid ◽  
Binary And Ternary Systems

Atom-probe analysis of the solid-liquid interface

1995 ◽  
Vol 53 ◽  
pp. 676-677
Author(s):  
J.A. Panitz
Keyword(s):  
Molecular Level ◽  
Selective Adsorption ◽  
Electronic Devices ◽  
Atom Probe ◽  
Chemical Agent ◽  
Hostile Environment ◽  
Solid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Chemically Selective

The first few atomic layers of a solid can form a barrier between its interior and an often hostile environment. Although adsorption at the vacuum-solid interface has been studied in great detail, little is known about adsorption at the liquid-solid interface. Adsorption at a liquid-solid interface is of intrinsic interest, and is of technological importance because it provides a way to coat a surface with monolayer or multilayer structures. A pinhole free monolayer (with a reasonable dielectric constant) could lead to the development of nanoscale capacitors with unique characteristics and lithographic resists that surpass the resolution of their conventional counterparts. Chemically selective adsorption is of particular interest because it can be used to passivate a surface from external modification or change the wear and the lubrication properties of a surface to reflect new and useful properties. Immunochemical adsorption could be used to fabricate novel molecular electronic devices or to construct small, “smart”, unobtrusive sensors with the potential to detect a wide variety of preselected species at the molecular level. These might include a particular carcinogen in the environment, a specific type of explosive, a chemical agent, a virus, or even a tumor in the human body.

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