STUDIES ON THE URANIUM EXTRACTION EQUILIBRIA, PHOTOLYTIC, AND HYDROLYTIC REACTIONS IN SYSTEMS CONTAINING TRI-n-BUTOXYETHYL PHOSPHATE

1964 ◽  
Vol 42 (4) ◽  
pp. 878-884 ◽  
Author(s):  
M. Halpern ◽  
T. Kim ◽  
A. S. Kertes ◽  
N. C. Li
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Organic Phase ◽  
Acid Content ◽  
Tributyl Phosphate ◽  
Extraction Behavior ◽  
Initial Aqueous Solution ◽  
Hydrolysis Of ◽  
Ethereal Oxygen ◽  
Extraction Equilibria

The extraction equilibria in the system aqueous hydrochloric acid – uranyl chloride –undiluted tri-n-butoxyethyl phosphate, TBEP, were examined as a function of increasing uranyl concentration (0.44 to 4.41 M) in the initial aqueous solution, the acid content of the initial aqueous solution being kept constant at 6.76 M. The extraction behavior of TBEP is found to be different from that of tributyl phosphate. Evidence has been presented to show that the three ethereal oxygen atoms in the TBEP molecule are, under high organic phase loading conditions, available for participation in complexation. The hydrochloric acid promoted hydrolysis of TBEP and the instability toward light of the TBEP layer containing hydrochloric acid and uranium were also examined.

Spectroscopic Study of the Uranyl—Acetohydroxamate Adduct with Tributyl Phosphate

2007 ◽  
Vol 61 (7) ◽  
pp. 772-776 ◽  
Author(s):  
Peter Tkac ◽  
Alena Paulenova ◽  
Kevin P. Gable
Keyword(s):  
Acetic Acid ◽  
Organic Phase ◽  
Tributyl Phosphate ◽  
Chelate Ring ◽  
Spectroscopic Studies ◽  
Acetohydroxamic Acid ◽  
Ft Ir ◽  
Uranium Distribution ◽  
Ir Spectroscopic ◽  
Hydrolysis Of

The ultraviolet–visible (UV-Vis) and Fourier transform infrared (FT-IR) spectroscopic studies carried out for the system UO2(NO3)/AHA/TBP (uranyl–acetohydroxamate–tributyl phosphate) confirmed the presence of the adduct of UO2(NO3)(AHA) ·2TBP with 1:1 stoichiometry for UO2:AHA (acetohydroxamic acid). The spectrum of this complex is identical to the infrared spectrum of the organic phase formed in the uranium distribution experiments with 30% TBP/n-dodecane and AHA present in aqueous phase. Disappearance of the hydroxyl stretching band and a shift in the position of the carbonyl band in the infrared spectra revealed that both the hydroxyl and the carbonyl group of acetohydroxamic acid are involved in the chelate ring with uranium. Also, acetic acid, accrued after acidic hydrolysis of acetohydroxamic acid, was identified in the extraction organic phase.

Stability of the Nerve Gas Antidote BIS (4-Hydroxyiminomethyl-1-Pyridinomethyl) Ether Dichloride (Toxogonin®)

1968 ◽  
Vol 2 (9) ◽  
pp. 234-243 ◽  
Author(s):  
Inga Christenson
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Sodium Hydroxide ◽  
Rate Constants ◽  
Kinetics Of Hydrolysis ◽  
Dilute Aqueous Solution ◽  
Nerve Gas ◽  
Ph Range ◽  
Kinetics Of ◽  
Hydrolysis Of

The products and kinetics of hydrolysis of the nerve gas antidote bis(4-hydroxyiminomethyl - 1 - pyridinemethyl) ether dichloride (Toxogonin ®) have been investigated. A survey of these studies is given: The hydrolytic reactions were studied in the pH range 1 M hydrochloric acid to 1 M sodium hydroxide at 25, 45, 75 and 85° C. Rate constants were determined in dilute aqueous solution, generally with an initial Toxogonin concentration of 0.01 mg per ml. In addition, a report is given concerning two-year storage of 25 percent (w/v) Toxogonin solutions at pH 2.5, 3.0 and 3.5. The solutions were stored in glass or polypropylene ampuls at 5, 15, 25 and 45°C. At 5 and 15C° decomposition was negligible, at 25 and 45 °C average decomposition was 1.5 percent and 3.3 percent, respectively.

Rod-Like Rutile Nanoparticles: Synthesis, Structure and Morphology

2017 ◽  
Vol 50 ◽  
pp. 32-40 ◽  
Author(s):  
Volodymyr Kotsyubynsky ◽  
Ivan Myronyuk ◽  
Volodymyr Chelyadyn ◽  
Andrii Hrubiak ◽  
Volodymyr Moklyak ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Specific Surface ◽  
Reaction Medium ◽  
Nucleation And Growth ◽  
Molar Ratio ◽  
Structure And Morphology ◽  
Nanoparticles Synthesis ◽  
Preferred Oriented ◽  
Hydrolysis Of

Nanodispersed rutile with rod-like particles is synthesized by hydrolysis of TiCl4 in hydrochloric acid - ethanol alcohol aqueous solution. It is found that the specific surface area, crystallite size and degree of agglomeration are determined by molar ratio of ethanol in reaction medium. According to HR-TEM images and XRD data rutile crystallites are preferred oriented along the [001] axis. The analysis of the Raman spectra for samples with different morphology is performed. The model of rutile nanorods nucleation and growth is proposed.

scholarly journals Rutile Nanorods: Synthesis, Structure and Electrochemical Properties

2014 ◽  
Vol 1 (1) ◽  
pp. 27-32
Author(s):  
V.O. Kotsyubynsky ◽  
I.F. Myronyuk ◽  
V.L. Chelyadyn ◽  
V.V. Moklyak
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Diffusion Coefficient ◽  
Hydrochloric Acid ◽  
Specific Surface ◽  
Specific Capacity ◽  
Power Sources ◽  
Molar Ratios ◽  
Hydrolysis Of ◽  
Galvanostatic Conditions

Nanodispersed rutile with rod-like particles was synthesized by hydrolysis of TiCl4 in hydrochloric acid - ethanol alcohol aqueous solution at 40°C. It was found that the specific surface area, crystallite size, degree of agglomeration are determined by molar ratios of ethanol. The obtained material was used as the base of cathode composition for lithium power sources. The maximum values of specific capacity (250 mAh/g) at discharge in galvanostatic conditions are fixed in the case of using material with the maximum agglomeration degree and minimal particle size. Phasic character of Li+ ions intercalation is set and the diffusion coefficient at different stages of the process is calculated.

Untersuchungen über die Kinetik der Spaltung von Di- und Tripeptiden

1964 ◽  
Vol 19 (12) ◽  
pp. 1095-1100 ◽  
Author(s):  
Hermann Hartmann ◽  
Joachim Heidberg
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Freeze Drying ◽  
Proteolytic Enzymes ◽  
Pure Water ◽  
Peptide Bond ◽  
Nucleophilic Attack ◽  
Acid Solutions ◽  
Hydrochloric Acid Solutions ◽  
Hydrolysis Of

The kinetic data of the hydrolysis of some serine peptides in diluted hydrochloric acid and in pure water and of the rearrangement of O-glycyl-DL-serine to glycyl-DL-serine were determined.The hydrolysis of glycyl-DL-serine and DL-alanyl-DL-serine proceeds surprisingly rapidly in pure water as compared with the hydrolysis of those peptides in 0.5 N hydrochloric acid as well as the hydrolysis of glycyl-DL-alanine in purely aqueous solution. The O → N migration of the glycyl residue in O-glycyl-DL-serine which probably is an intermediate in the cleavage of glycyl-DL-serine in purely aqueous solution represents a three center reaction in which the nucleophilic attack on the O-peptide and peptide bond, respectively, involves a free basic amino group. The analogy between the serine peptide interconversion and the hydrolysis catalyzed by certain proteolytic enzymes is referred to.Under the conditions of freeze drying are formed in hydrochloric acid solutions of DL-alanyl-DL-serine O-peptide and depsipeptide.

Studying dispersed and rheological properties of hydrocarbon-containing acid emulsions and their efficiency in removing asphalt-resin-paraffin deposits

2020 ◽  
pp. 128-139
Author(s):  
M. Yu. Shumakher ◽  
V. V. Konovalov ◽  
A. P. Melnikov
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Rheological Properties ◽  
Reaction Rate ◽  
Experimental Studies ◽  
Efficient Removal ◽  
Reservoir Properties ◽  
Hydrocarbon Solvents ◽  
Formation Zone ◽  
Effect Of The Composition

Currently, the treatment of the bottomhole formation zone with acidic compositions is one of the most common methods to intensify the oil inflow. The use of various modified acid compositions increases the efficiency of acid treatments on the bottomhole formation zone. Acid compositions, including those containing hydrocarbon solvents, which contribute to more efficient removal of organic colmatants, affect the reaction rate of the reagent with the rock and processing equipment, change the reservoir properties, etc.The article presents the results of experimental studies, which are aimed at establishing the effect of the composition of hydrocarbon-containing acidic emulsions consisting of an aqueous solution of hydrochloric acid, toluene and Neonol AF 9-10 on their dispersed and rheological properties, as well as their efficiency in removing paraffin deposits.

Reactions in Activated Peroxide Systems and their Influences on Bleaching Performance

2020 ◽  
Vol 17 ◽  
Author(s):  
Xiaoyan Wang ◽  
Jinmei Du ◽  
Changhai Xu
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Energy Efficiency ◽  
Textile Industry ◽  
High Energy ◽  
Side Reactions ◽  
Competitive Reactions ◽  
High Energy Efficiency ◽  
Hydrolysis Of ◽  
Bleach Activators

Abstract:: Activated peroxide systems are formed by adding so-called bleach activators to aqueous solution of hydrogen peroxide, developed in the seventies of the last century for use in domestic laundry for their high energy efficiency and introduced at the beginning of the 21st century to the textile industry as an approach toward overcoming the extensive energy consumption in bleaching. In activated peroxide systems, bleach activators undergo perhydrolysis to generate more kinetically active peracids that enable bleaching under milder conditions while hydrolysis of bleach activators and decomposition of peracids may occur as side reactions to weaken the bleaching efficiency. This mini-review aims to summarize these competitive reactions in activated peroxide systems and their influence on bleaching performance.

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