scholarly journals Electro-Decontamination of Spent Ion Exchange Resins Contaminated with Iron Oxide Deposits under Dynamic Conditions

2021 ◽  
Vol 13 (9) ◽  
pp. 4756
Author(s):  
Eduard Tokar ◽  
Anna Matskevich ◽  
Andrei Egorin
Keyword(s):  
Sulfuric Acid ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Current Treatment ◽  
Dynamic Conditions ◽  
Rate Of Dissolution ◽  
Exchange Resins ◽  
Sulfuric Acid Solutions ◽  
Positive Effect

A method for the electro-decontamination of spent ion exchange resin contaminated with hematite under dynamic conditions using sulfuric acid solutions has been suggested. It has been shown that decontamination under dynamic conditions excludes the secondary adsorption of radionuclides on ion-exchanger sites. The efficiency of this approach has been compared to that of control experiments without direct current treatment. A positive effect of the introduction of Fe2+ on the rate of dissolution of hematite has been demonstrated. This allows for decreasing the concentration of the sulfuric acid solution without decreasing the decontamination efficiency.

scholarly journals THE STUDY OF SORPTION OF NICKEL, COBALT, COPPER IONS RECOVERY FROM MULTICOMPONENT SOLUTIONS BY VARIOUS ION EXCHANGE RESINS

2021 ◽  
pp. 45-52
Author(s):  
Людмила Сергеевна Авфукова
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Copper Ions ◽  
Ion Exchange Resin ◽  
Copper Recovery ◽  
Nickel Cobalt ◽  
Sorption Method ◽  
Modern Methods ◽  
Exchange Resins ◽  
Multicomponent Solutions

Статья посвящена одному из современных методов и технологий извлечения никеля, кобальта и меди из многокомпонентных растворов - сорбционный метод. В качестве сорбентов выступают ионообменная смола КУ-2-8 и хелатообразующие смолы. Рассмотрен один изметодов удаления веществ, сопутствующих, мешающих извлечению ценных компонентов, одним из которых является железо. The paper considers one of the modern methods and technologies of nickel, cobalt and copper recovery from multicomponent solutions; that is a sorption method. KU-2-8 ion exchange resin and chelating resins are present as sorbents. One of the method of substances which prevent removing valuable components is discussed. One of such substance is considered to be iron.

Study of LPOP Residue on Resin Mineralization and Solidification

2010 ◽  
Author(s):  
Gen-ichi Katagiri ◽  
Morio Fujisawa ◽  
Kazuya Sano ◽  
Norikazu Higashiura
Keyword(s):  
Ion Exchange ◽  
Inductively Coupled Plasma ◽  
Exchange Resin ◽  
Low Pressure ◽  
Cold Test ◽  
Ion Exchange Resin ◽  
Temperature Plasma ◽  
Volume Weight ◽  
Exchange Resins ◽  
Spent Resin

Fuji Electric had developed the low pressure oxygen plasma technology for mild decomposition and mineralization of an organic material such as ion exchange resin. This method is suitable for radioactive spent resin volume/weight reduction and stabilization for final disposal. On this process, the ion-exchange resins are vaporized and decomposed into gas-phase with pyrolysis, and then, they are decomposed and oxidized with low-pressure plasma activity based on oxygen. And this process is achieved under moderate condition for radio active waste. • incinerate temperature: 400–700 deg C; • low-pressure (low-temperature) plasma condition: 10–50 Pa. From the result of this process, named of LPOP(low pressure oxidation process) by the inductively coupled plasma, we have confirmed that the process is applicable for organic fireproof waste including ion-exchange resin, and found that the used resin treatment performance is the same as cold test (using imitate spent resin) [1] [2] [3]. In this paper, the outline of the LPOP technology, and two research results on the possibility of solidification with cement of LPOP residue for geological disposes are reported. (1)Study of the residue chemical form after LPOP process (2)Study of the solidification character with cement.

scholarly journals Catalytic Dehydration of Fructose to 5-Hydroxymethylfurfural (HMF) in Low-Boiling Solvent Hexafluoroisopropanol (HFIP)

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1866 ◽  
Author(s):  
Sarah Tschirner ◽  
Eric Weingart ◽  
Linda Teevs ◽  
Ulf Prüße
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Reaction System ◽  
Water System ◽  
Catalyst Particle ◽  
Ion Exchange Resin ◽  
Ion Exchange Resins ◽  
Reaction Conditions ◽  
Water As Solvent ◽  
Exchange Resins

A mixture of hexafluoroisopropanol (HFIP) and water was used as a new and unknown monophasic reaction solvent for fructose dehydration in order to produce HMF. HFIP is a low-boiling fluorous alcohol (b.p. 58 °C). Hence, HFIP can be recovered cost efficiently by distillation. Different ion-exchange resins were screened for the HFIP/water system in batch experiments. The best results were obtained for acidic macroporous ion-exchange resins, and high HMF yields up to 70% were achieved. The effects of various reaction conditions like initial fructose concentration, catalyst concentration, water content in HFIP, temperature and influence of the catalyst particle size were evaluated. Up to 76% HMF yield was attained at optimized reaction conditions for high initial fructose concentration of 0.5 M (90 g/L). The ion-exchange resin can simply be recovered by filtration and reused several times. This reaction system with HFIP/water as solvent and the ion-exchange resin Lewatit K2420 as catalyst shows excellent performance for HMF synthesis.

SELECTION OF ION-EXCHANGE RESIN FOR EXTRACTION OF REE FROM COMPLEX SOLUTIONS DURING PROCESSING OF OIL CRACKING CATALYST

2020 ◽  
Vol 25 (2) ◽  
pp. 39-43
Author(s):  
Mariya Pogodaeva ◽  
Alexandra Bogdanova ◽  
Lyudmila Adeeva
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Distribution Coefficients ◽  
Ion Distribution ◽  
Ion Exchange Separation ◽  
Complex Solutions ◽  
Exchange Resins ◽  
Oil Cracking ◽  
Selection Of

It was found that the ion exchange resins Purolite C100 H and Purolite S-957 can be used to extract lanthanum (III) ions from solutions. The values of the resin capacities for lan-thanum (III), iron (III) and aluminum and the ion distribution coefficients for both resins were determined. It is shown that according to the values of the separation coefficients, Purolite C100 H resin can be used for ion exchange separation of lanthanum ions from complex solutions

Development of pyrolytic monolithic carbon composites for the conditioning of spent ion exchange resins

2012 ◽  
Vol 1475 ◽  
Author(s):  
Pamela B. Ramos ◽  
Néstor O. Fuentes ◽  
Vittorio Luca
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Processing Parameters ◽  
Ion Exchange Resin ◽  
Mathematical Functions ◽  
Waste Forms ◽  
Resin Beads ◽  
Temperature Ramp ◽  
Exchange Resins

ABSTRACTThe pyrolysis of ion exchange resin beads that are used for the purification of water in reactor primary- and secondary-cooling circuits can result in stable and leach resistant carbonaceous products. However, free flowing beads are less desirable waste forms for disposal in sub-surface or surface repositories than monolithic masses of low porosity. We have investigated the pyrolysis of polymeric resin – cation exchange resin composites to give mechanically robust and chemically durable monolithic carbonaceous waste forms that are suitable for repository disposition. Also investigated was the dependence of product properties on various processing parameters (temperature ramp and final temperature). As a first approach, epoxy resins were used for the preparation of monoliths since such resins cure at room temperature and result in a relatively high carbon yield. Carbonaceous monolithic products were prepared at 400, 500, 600, 700 and 800 °C using a temperature ramp of 2°C/min. The products were maintained at the chosen temperatures for a period of one hour. Mass losses, volume reduction, hardness and compressive strength were measured and mathematical functions are proposed to describe the measured values of these properties. The carbon monoliths were observed to be mechanically robust.

scholarly journals Synthesis and Thermal Stability of Melamine-Formaldehyde-Nitro Aniline Ion-Exchange Resin

2014 ◽  
Vol 32 ◽  
pp. 112-118 ◽  
Author(s):  
Shailesh N. Zala ◽  
Mitesh B. Gondaliya ◽  
Javed G. Mahetar
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Antimicrobial Activities ◽  
Ion Exchange Resins ◽  
Moderate Activity ◽  
Melamine Formaldehyde ◽  
Exchange Resins ◽  
Thermal Stability Of

A series of resins was synthesized and analyzed for selective ion-exchange nature for some metals. Substituted aniline was reacted with formaldehyde, melamine. For the synthesis of ion-exchange resins, sulfuric acid was used as a catalyst. These resins were characterized by elemental analysis and studied antimicrobial activities. Synthesized Resin shows ion exchange capability and moderate activity against microbial. Ion exchange resin also showed reusability and stability at an elevated temperature.

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