Disposal of Chlorine-Containing Wastes

Локтева, Е. С.; Голубина, Е. В.; Лихолобов, В. А.; Лунин, В. В.

doi:10.1007/978-3-319-30073-3_21

Cited by 6 publications

(15 citation statements)

References 133 publications

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“…A significant number of review articles on the problems of catalytic hydrodechlorination published over the past 25 years [4,9,10,26,28] point to the serious role of this direction in the development of chemistry and organochlorine synthesis, as well as to the great attention that the authors give to the solution of the environmental issues. This is also confirmed by the extensive data on the processing of organochlorine wastes by various methods (oxidation, oxychlorination, pyrolysis, chlorination, electrocracking), among which the catalytic hydrodechlorination plays a significant role [5,9].…”

Section: Catalytic Hydrodechlorinationmentioning

confidence: 99%

“…The oxidative state of the active metal is one of the key factors determining activity of the catalysts [9]. In this a case the ratio Me(0) to Me(n + ) is important.…”

Section: Catalytic Systemsmentioning

confidence: 99%

“…E. Lokteva et al [9] indicate a frequently encountered synergistic effect when using bimetallic hydrodechlorination catalysts.…”

Section: Catalytic Systemsmentioning

confidence: 99%

“…In order to identify the general patterns of hydrodechlorination processes, attempts have repeatedly been made to generalize and systematize data published in [2,3,8,9]. Of the summarizing materials, one should note the reviews [4,10] published in the 1990s.…”

mentioning

confidence: 99%

“…HCl 2 (6) Dichloromethyl and trichloromethyl radicals formed in these reactions recombine to form higher products. The appearance of small amounts of CH 2 Cl 2 and CCl 4 indicates [1,20] as well the course of the reaction according to the Equations (7), (8) or (9), (10) C . HCl 2 + CHCl 3 CH 2 Cl 2 + C .…”

mentioning

confidence: 99%

See 4 more Smart Citations

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Flid¹,

Kartashov²,

Treger³

2020

Catalysts

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The commercial implementation of hydrodechlorination processes will be an essential step in resolving the problem of environmentally sound organochlorine wastes processing. By now, there is a number of fundamental, applied, and process elaborations of such processes, in which chlorine is almost completely removed from wastes. The review article contains a significant number of results including basic regularities of thermal hydrodechlorination, comprehensive and selective catalytic hydrodechlorination. It discusses thermodynamics, kinetics, and catalysts of gas and liquid phase processes. Considerable attention is paid to hydrodechlorination of vinyl chloride production wastes and utilization of tetrachloromethane, which is the ozone-depleting substance. It also discusses hydrodechlorination of mono-and (poly)chlorobenzenes. The important examples of liquid phase data include hydrogenation using complex hydrides of elements. It also includes several flow sheets of hydrodechlorination processes.Various methods for C-Cl bonds reduction in non-cyclic organochlorine compounds can be divided into the following groups:Catalysts 2020, 10, 216 3 of 52 one should note the reviews [4,10] published in the 1990s. It is noted that catalytic methods are more widely used for hydrodechlorination. Electrochemical ReductionElectrochemical reduction is a complex process in which the speed and direction of reactions depend on many factors. It is characterized by the following features. Two electrons are spent for breaking the C-Cl bond; the half-wave potential in most cases does not depend on the pH of the medium; in general, the electrode reaction is irreversible [1]. There is an approximate linear relationship between the half-wave potential of the reactionsIn [12], a scheme was proposed describing the mechanism of electrochemical reduction of the C-Cl bondRClHowever, there is another point of view, according to which there is a simultaneous transfer of a pair of electrons, similar to that for nucleophilic substitution reactions [1].Electrochemical reduction is carried out on cathodes of copper, zinc, amalgamated zinc, palladium, cadmium, mercury, and lead [13]. The cathodic dechlorination proceeds in an alkaline environment more efficiently than in an acidic one; however, in most cases, acidic electrolytes are used to avoid such side reactions as saponification [13,14]. The recovery is usually carried out in inert solvents, in particular in alcohols. In [13], the influence of the reduction conditions-the cathode material, current density, the nature of electrolyte and solvent, the concentration of the reducible substance, and temperature-on the course of the reaction is described.The recovery of monochlorohydrocarbons is difficult and results mainly in the replacement of chlorine by hydrogen in accordance with the overall equationIn some cases, dimeric compounds (R-R) are formed according to the schemeThe recovery of vinyl chlorine is difficult, and that of the allyl one is facilitated in comparison with chlorine in saturated com...

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Section: Catalytic Hydrodechlorinationmentioning

confidence: 99%

“…The oxidative state of the active metal is one of the key factors determining activity of the catalysts [9]. In this a case the ratio Me(0) to Me(n + ) is important.…”

Section: Catalytic Systemsmentioning

confidence: 99%

“…E. Lokteva et al [9] indicate a frequently encountered synergistic effect when using bimetallic hydrodechlorination catalysts.…”

Section: Catalytic Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Flid¹,

Kartashov²,

Treger³

2020

Catalysts

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Fast and Facile Etching of Gold Nanorods by N-Halosuccinimides: Toward Multicolorimetric Identification and Quantification of 20 Natural Amino Acids

Ghamsari,

Orouji,

Hormozi-Nezhad

2023

Anal. Chem.

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Gold nanorods (AuNRs) have recently become fascinating chromophores in the field of colorimetric sensing because of their eye-catching rainbow colors along with the high dimensionality of their optical profile. The etching of AuNRs using an analyte-sensitive oxidizing agent is particularly an attractive tool not only for adjusting their plasmonic behavior through altering their aspect ratio but also for correlating the observed signal with the identity and concentration of the analyte. However, the deployment of this strategy in the field of sensing has been seriously hindered by various factors ranging from slow etching kinetics and the need for nonambient temperatures to low degrees of controllability along with the high toxicity of the etchants. To resolve these challenges, the present study aims to introduce the outstanding potentials of two inexpensive mild oxidants comprising N-bromosuccinimide (NBS) and N-chlorosuccinimide (NCS) in the highly fast and controllable etching of AuNRs at room temperature. By controlling the concentration of the etchant and the pH of the medium, the longitudinal and transversal peaks could be well adjusted with nanometer precision. In an attempt to elucidate the etching mechanism, the effects of various parameters including the etchant concentration and pH, as well as the kinetics of the etching process were thoroughly investigated. After all, the capability of NBS in decarboxylating the amino acids was further exploited in the design of an all-inclusive multicolorimetric sensor array based on the etching of AuNRs for the sensitive quantification and highly accurate discrimination of all 20 amino acids in the micromolar range. To this end, the acquired data set was analyzed by two machine learning techniques including partial least-squares regression (PLSR) and linear discriminant analysis (LDA). The versatility of N-halosuccinimide reactions with various categories of organic compounds underlies ample opportunities for the design of diverse multicolorimetric sensors, further glamorizing the prospect of this approach.

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Effect of Iron Content in Alumina-Supported Palladium Catalysts and Their Reduction Conditions on Diclofenac Hydrodechlorination in an Aqueous Medium

Lokteva,

Pesotskiy,

Golubina

et al. 2024

Kinet Catal

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Disposal of Chlorine-Containing Wastes

Cited by 6 publications

References 133 publications

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Theoretical and Applied Aspects of Hydrodechlorination Processes—Catalysts and Technologies

Fast and Facile Etching of Gold Nanorods by N-Halosuccinimides: Toward Multicolorimetric Identification and Quantification of 20 Natural Amino Acids

Effect of Iron Content in Alumina-Supported Palladium Catalysts and Their Reduction Conditions on Diclofenac Hydrodechlorination in an Aqueous Medium

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