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Bibliographies thématiques / Polyfunctional exchangers

Littérature scientifique sur le sujet « Polyfunctional exchangers »

Auteur : Grafiati

Publié le 18 mai 2024

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Articles de revues sur le sujet "Polyfunctional exchangers"

1

Ergozhin, E. E., T. K. Chalov, A. G. Rozhkova et R. A. Iskakova. « Epichlorohydrin-Based Polyfunctional Ion Exchangers ». Russian Journal of Applied Chemistry 78, n^o 10 (octobre 2005) : 1600–1604. http://dx.doi.org/10.1007/s11167-005-0569-4.

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Ergozhin, E. E., N. N. Chopabaeva et B. T. Tairova. « Polyfunctional ion-exchangers based on wood ». Chemistry of Natural Compounds 42, n^o 5 (septembre 2006) : 596–99. http://dx.doi.org/10.1007/s10600-006-0222-3.

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Sadykov, К. A., N. A. Bektenov et L. K. Ybraimzhanovа. « Obtaining new polyfunctional ion-exchange sorbents ». Chemical Journal of Kazakhstan 78, n^o 2 (15 juin 2022) : 70–79. http://dx.doi.org/10.51580/2022-2/2710-1185.66.

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The purposeful synthesis of polymeric chelate-forming sorbents, distinguished by high efficiency, selectivity of action, cost-effectiveness, is one of the promising directions in the field of increasing selectivity of the sorption processes. The paper aims at the synthesis of new ionic compounds, based on the copolymers of glycidyl methacrylate and chelating agent - oxyethylidenediphosphonic acid. The preparation of the insoluble complex sorbents by the method of a chemical modification with the introduction of a soluble complexone, hydroxyethylidenediphosphonic acid, widely used in the industry and heat engineering, into the polymer matrix has been studied. The ways of obtaining new ion-exchange resins, based on a double copolymer of glycidyl methacrylate, methyl methacrylate and oxyethylenediphosphonic acid complexon, have been developed. The optimal mode for obtaining the ion exchangers, based on a double copolymer of glycidyl methacrylate, methyl methacrylate and oxyethylenediphosphonic acid, is the mass ratio of copolymer:acid 1.0:1.0, at a temperature of 90 0C, and heating during 10 hours. The yield of ion exchangers makes up 78-80%. The composition and structure of the obtained ionites have been identified by the infrared spectroscopy and elemental analysis. The static exchange capacity for 0.1 М NaOH solution is 5.92 mg-eq/g. It has been found that the obtained ionite has a satisfactory chemical resistance to various acids, alkalis and oxidants, the loss of the static exchange capacity does not exceed 7%. The resulting ionite can be used as a sorption material for the industrial wastewater treatment from various metal ions.

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Khakimbolatova, K. Kh, E. E. Ergozhin, T. K. Chalov, T. V. Kovrigina et A. I. Nikitina. « New polyfunctional anion exchangers for platinum metal sorption ». Russian Journal of Applied Chemistry 83, n^o 6 (juin 2010) : 941–44. http://dx.doi.org/10.1134/s1070427210060029.

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5

Ergozhin, E. E., N. A. Bektenov, K. M. Kalmuratova, K. A. Sadykov, G. E. Abdralieva et Zh N. Kainarbaeva. « SYNTHESIS AND INVESTIGATION OF THE CHELATING ION EXCHANGERS BASED ON COPOLYMERS OF EPOXYACRYLATE ». Chemical Journal of Kazakhstan 73, n^o 1 (14 mars 2021) : 24–33. http://dx.doi.org/10.51580/2021-1/2710-1185.02.

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The possibilities of obtaining new chelating (complexing) ion exchangers based on copolymers of glycidyl methacrylate (GMA), methyl methacrylate (MMA), tripropylene glycol diacrylate (TPGDA), and oxyethylenediphosphonic acid complexone (OEDP) were studied. The optimal synthesis conditions and studied the physicochemical properties of the resin.To assess the acid-base properties of the synthesized polyelectrolytes, potentiometric studies were carried out, it was determined that the new ion exchangers have a medium acid character, and also belong to polyfunctional ion exchangers. The structure of the synthe-sized ion exchangers GMA-TPGDA-MMA: OEDP, GMA-MMA: OEDP was established by IR spectroscopy and elemental analysis. Studied the influence of the ratio of the initial reacting components, temperature and duration of the process on the static exchange capacity of ion exchangers. It was found that an increase in the amount of oxyethylenediphosphonic acid in the initial mixture in the reaction mixture from 1.0 to 3.0 mass parts leads to an increase in the capacity from 4.3 mEq / g to 6.2 mEq / g according to GMA-TPGDA- MMA: HEDP, from 4.8 mEq / g to 6.6 mEq / g according to GMA-MMA: HEDP. The chemical stability of the ion exchan-gers showed that the obtained ion exchangers are quite inert to chemical reagents. The most stable was the cation exchanger based on the ternary copolymer GMA-TPGDA-MMA: HEDP with a mass ratio of 1: 3. The degree of loss of capacity of the ion exchanger, obtained on its basis, does not exceed 9% when treated with solutions of acids, alkalis, and under the action of oxidizing agents, SEC practically does not change.

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Ergozhin, E. E., T. K. Chalov, R. A. Iskakova et T. V. Kovrigina. « Polyfunctional Anion Exchangers Based on Copolymers of Allyl Glycidyl Ether and Polyamines ». Russian Journal of Applied Chemistry 77, n^o 3 (mars 2004) : 458–62. http://dx.doi.org/10.1023/b:rjac.0000031291.66677.e2.

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Polyakova, Irina V., et Oleg A. Pisarev. « Influence of polyfunctional interactions between organic zwitter-ion eremomycin and carboxylic cation exchangers on forming concentration front ». Journal of Chromatography A 1092, n^o 1 (octobre 2005) : 135–41. http://dx.doi.org/10.1016/j.chroma.2005.07.017.

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Ergozhin, E. E., A. K. Chalov, B. A. Mukhitdinova et R. A. Iskakova. « Polyfunctional Anion Exchangers on the Basis of Allyl Compounds, Glyсydilic Ethers of Dioxybenzenes and Some Di- and Polyamines ». Eurasian Chemico-Technological Journal 3, n^o 1 (21 septembre 2016) : 37. http://dx.doi.org/10.18321/ectj383.

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Scientific basis for preparation of new carbon-mineral adsorbents, supports, highly selective catalysts, and composite materials synthesized by a carbide cycle mechanism on the finely disperse particles of the iron subgroup metals, their alloys with some other metals is discussed. It was found that the carbide cycle mechanism involves the chemical and physical steps. The regularities of the process performance on the both stages are considered. Graphite filaments may be formed of graphite layers with either coaxial-cylindrical, coaxial-conic or stack orientations in the filament body. A number of primary and secondary properties of the graphite aggregates is being discussed. We have developed the methods for control the synthesis of carbon-mineral materials of the specified properties by varying the parameters of the metal particles, the nature of hydrocarbon decomposition, and the process mode.

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Herrera-Rodríguez, Tamy, Lina S. Miranda-Jiménez et Ángel D. González-Delgado. « Computer-Aided Exergy Sensibility Analysis of Nitrobenzene Production through Benzene Nitration Using an Acid Mixture ». International Journal of Chemical Engineering 2019 (3 mars 2019) : 1–7. http://dx.doi.org/10.1155/2019/6986709.

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Nitrobenzene is widely produced via benzene nitration to be applied in several industries such as pharmaceutical, textile, and agricultural. In this work, an exergy sensibility analysis was performed with the aim of identifying possible opportunities of process improvements. The irreversibilities, exergy of wastes, and efficiency were calculated per stage through exergy balance. The simulation software Aspen plus V10.1 provided the physical exergies of process streams while chemical exergies were found in literature. A sensibility analysis was also carried out in order to study the effect of efficiency of some stages (polyfunctional reaction and cooling 1) on global exergy efficiency. This analysis reveals that nitrobenzene production from benzene is an efficient process from an exergy viewpoint (88%). The total irreversibilities, total exergy of wastes, and exergy of utilities-inlet were calculated in 41,647,341.85 MJ/h, 5,537,487.3 MJ/h, and 18,137,363.71 MJ/h, respectively. The results obtained from sensibility analysis suggested that heat flow of heat exchangers HE-201, HE-303, and HE-301 could provide energy requirements for heating.

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Kremsmair, Alexander, Johannes H. Harenberg, Kuno Schwärzer, Andreas Hess et Paul Knochel. « Preparation and reactions of polyfunctional magnesium and zinc organometallics in organic synthesis ». Chemical Science 12, n^o 17 (2021) : 6011–19. http://dx.doi.org/10.1039/d1sc00685a.

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Polyfunctional Mg and Zn organometallics can be prepared from organic halides by metal insertions, halogen/metal-exchanges or metalations with TMP-bases. These intermediates can be used in new cross-couplings, aminations or continuous flow set-ups.

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