Evaluation of Leachable Behavior from Ion Exchange Resins

Igarashi, Hiroo; Nishimura, Yusaku; Ohsumi, Katsumi; Uchida, Shunsuke; Matsui, Tsuneo

doi:10.1080/18811248.1999.9726227

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…These compounds are released in solution through leaching and gradual deterioration of the resin. Ionized or non-ionized, they mostly consist of trimethylamine from the resin's functional groups and other polymer residues [19][20][21]. This organic leaching effect is the reason why, though the resin is needed to capture free radicals created by the TOC-UV lamp, the TOC-UV lamp is needed to break these organic compounds into free radicals in return.…”

Section: Circulation With a Gd 2 (So 4 ) 3 Solutionmentioning

confidence: 99%

Development of an ion exchange resin for gadolinium-loaded water

Fischer¹,

He²,

Irving³

et al. 2020

J. Inst.

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Large water Cherenkov detectors have been successfully used for decades in high- and low-energy particle physics. Nevertheless, detecting neutrons remains a challenge for such detectors since a neutron capture on a hydrogen atom doesn't release a sufficient amount of gamma energy to be observed efficiently. The use of gadolinium in the form of soluble salts has been explored extensively to remedy this issue, as gadolinium exhibits both a very large neutron capture cross section and a subsequent high-energy gamma cascade. However, in order for large gadolinium-loaded detectors to operate stably over long time periods, water optical transparency must be maintained by in situ purification. New methods have been developed involving band-pass molecular filtering. While these methods are very successful, they are expensive and consume considerable power and space as they seek to minimize loss of gadolinium while removing other impurities. For smaller detectors where some gadolinium loss can be tolerated, a less expensive way to do this is very desirable. In this paper, we describe the design, development and testing of a system used to purify the gadolinium-loaded water in the 26-ton ANNIE neutrino detector.

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Section: Circulation With a Gd 2 (So 4 ) 3 Solutionmentioning

confidence: 99%

Development of an ion exchange resin for gadolinium-loaded water

Fischer¹,

He²,

Irving³

et al. 2020

J. Inst.

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Hydrolysis of Sucrose over Sulfonic Acid Resins

2021

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Sucrose hydrolysis on acidic ion‐exchange resins is a long‐established process in the sugar industry, but the formation of side products is less understood. A resin typically used in the industrial process (C124SH, Purolite) was investigated in a broad range of sucrose concentration (7 to 75 % w/w) and temperatures from 25 to 80 °C. Fructose is converted to 5‐hydroxymethylfurfural (HMF) due to a 1/2 order reaction. This is explained by the formation of a fructose disaccharide (monoanhydride) as an intermediate decomposing to HMF and fructose. Difructose dianhydrides (DFAs) are separately formed as prevailing by‐products. The color of the product mixture is correlated to HMF and found to be reduced by size exclusion inside the resins. Diffusional limitations of the total reaction are investigated by comparison of the entire resin bead with its size‐reduced forms obtained by milling. Without diffusion limitation the catalytic activity increases with the sugar concentration while the diffusion control leads to a maximal activity around 40 % w/w sugar. Diffusion coefficients of sucrose are calculated.

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