scholarly journals Determination of Hydration Kinetics of Sulfaguanidine Anhydrate in Aqueous Solution by Calorimetry.

2000 ◽  
Vol 48 (2) ◽  
pp. 208-210
Author(s):  
Yasuo YOSHIHASHI ◽  
Etsuo YONEMOCHI ◽  
Midori MAKITA ◽  
Shigeo YAMAMURA ◽  
Eihei FUKUOKA ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydration Kinetics ◽  
Kinetics Of

scholarly journals Determination of Heat of Hydration and Hydration Kinetics of Theophylline by Thermal Analysis.

1998 ◽  
Vol 46 (7) ◽  
pp. 1148-1152 ◽  
Author(s):  
Yasuo YOSHIHASHI ◽  
Midori MAKITA ◽  
Shigeo YAMAMURA ◽  
Eihei FUKUOKA ◽  
Katsuhide TERADA
Keyword(s):  
Thermal Analysis ◽  
Heat Of Hydration ◽  
Hydration Kinetics ◽  
Kinetics Of

Enhancement of carboxylic acid degradation with sulfate radical generated by persulfate activation

2010 ◽  
Vol 61 (5) ◽  
pp. 1221-1226 ◽  
Author(s):  
J. Criquet ◽  
P. Nebout ◽  
N. Karpel Vel Leitner
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Carboxylic Acids ◽  
Sulfate Radical ◽  
Acid Degradation ◽  
Competitive Reactions ◽  
Radical Production ◽  
Persulfate Activation ◽  
Kinetics Of

The aim of this work was to investigate the generation of sulfate radical for the removal of two carboxylic acids in aqueous solution: acetic and citric acids. From photochemical and radiolytic processes, kinetics of the degradation of these two carboxylic acids was studied as a function of the pH of the solution. It was shown that the maximum of acetic acid degradation occurred at pH 5. Above this pH, competitive reactions with the carbon mineralized inhibit the reaction of with the solute. In the case of citric acid, pH has only a little effect on the kinetic of citric acid degradation. The determination of mineralization yields shows several differences depending on carboxylic acids and pH. The degradation of both carboxylic acids was also studied in the radiolysis process whether with or without persulfate addition. A comparison of the processes of sulfate radical production is presented.

scholarly journals ACETONE HYDRATION KINETICS AND EVALUATION OF INPUT OF 2-PROPANOL DEHYDRATION REACTION ON RANEY NICKEL UNDER HYDROGENATION CONDITIONS

2018 ◽  
Vol 59 (1) ◽  
pp. 14
Author(s):  
Yu.E. Romanenko ◽  
A.A. Merkin ◽  
O.V. Lefedova
Keyword(s):  
Aqueous Solution ◽  
Kinetic Model ◽  
Raney Nickel ◽  
Rate Constants ◽  
Dehydration Reaction ◽  
Hydrogenation Rate ◽  
Hydration Kinetics ◽  
Skeletal Nickel ◽  
Kinetics Of ◽  
Acetone Hydrogenation

The problem of kinetics of skeletal nickel samples saturation with hydrogen in an aqueous solution of 2-propanol of azeotropic composition was discussed. 2-propanol dehydrogenation and acetone hydrogenation rate constants were calculated. Kinetic model of processes under study was offered.

scholarly journals Determination of the structural and chemisorption characteristics of granulated active charcoal on the basis of coconut shell

2004 ◽  
Vol 58 (9) ◽  
pp. 416-422
Author(s):  
Dragan Milenkovic ◽  
Stanisa Stoiljkovic ◽  
D.R. Ilic
Keyword(s):  
Mathematical Model ◽  
Aqueous Solution ◽  
Structural Characteristics ◽  
Active Charcoal ◽  
Wastewater Purification ◽  
Industrial Plants ◽  
Coconut Shells ◽  
Kinetics Of ◽  
Regression Correlation

Wastewater purification and the acquirement of drinking water from water streams that are in most cases recipients of various industrial plants, present a significant problem nowadays. The structural characteristics of granulated active charcoal (GAC) obtained by the carbonization of coconut shells and activated by steam are presented in this paper. The established kinetics of suspending cyanide from aqueous solution using GAC impregnated with copper(II) acetate were studied and a mathematical model estabkusged by a regression - correlation analysis.

scholarly journals Continuous assay for acid phosphatase using 1-naphthyl phosphate as a substrate.

1997 ◽  
Vol 44 (4) ◽  
pp. 853-860 ◽  
Author(s):  
E Luchter-Wasylewska
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Acid Phosphatase ◽  
Reverse Micelles ◽  
Prostatic Acid Phosphatase ◽  
Precise Determination ◽  
Ph Range ◽  
Phosphatase Assay ◽  
Kinetics Of

The described continuous acid phosphatase assay is based on kinetics of the release of 1-naphthol in the course of the enzyme-catalyzed hydrolysis of 1-naphthyl phosphate, measured at 320 nm in aqueous solution and at 322 nm in sodium-bis(2-ethylhexyl)sulfosuccinate isooctane-water reverse micelles in a broad pH range (1.0-8.2). The method allows precise determination of the initial rate of the reaction and therefore may be used in the steady-state and pre-steady-state studies on the phosphatase-catalyzed reaction. The kinetic parameters (Km and kcat) for human prostatic acid phosphatase in aqueous solution and in reverse micelles, at pH 3.8, 4.5 and 5.7, by the proposed 1-naphthyl phosphate assay have been determined.

Quantitative Determination of Sodium Metatungstate Speciation by 183W N.M.R. Spectroscopy

2000 ◽  
Vol 53 (12) ◽  
pp. 965 ◽  
Author(s):  
Bradley J. Smith ◽  
Vincent A. Patrick
Keyword(s):  
Aqueous Solution ◽  
Quantitative Determination ◽  
Direct Observation ◽  
Solubility Product ◽  
High Concentration ◽  
Kinetics Of ◽  
Paratungstate B

The speciation and equilibria of sodium metatungstate, Na6[H2W12O40], has been determined by a combination of 183W n.m.r. spectroscopy and gravimetry over the p[H] range 4.5–10.0. The use of n.m.r. spectroscopy allowed the direct observation of polytungstate anions in aqueous solution and high concentration (0.25 mol l–1). Sodium metatungstate, with the progressive addition of base, was found to decompose to paratungstate A, [W7O24]6–. Paratungstate A then slowly converted to paratungstate B, [H2W12O42]10–. The kinetics of equilibrium was found to be slow, requiring up to 8 months to stabilize. With the addition of further base paratungstate B decomposed to orthotungstate, WO42–. Logarithmic constants (logK) for these transformations were determined as 195, 20 and 118, respectively. The solubility product for sodium paratungstate B was determined to be 6.89 ( 0.80) 10–6.

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