Accessibility of active groups in acidic styrene-divinylbenzene ion exchange resins of various cross-linking in sorption of ethyl acetate from the gas phase

1977 ◽  
Vol 42 (3) ◽  
pp. 805-810 ◽  
Author(s):  
K. Jeřábek
Keyword(s):  
Ion Exchange ◽  
Ethyl Acetate ◽  
Gas Phase ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Styrene Divinylbenzene ◽  
Exchange Resins

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

scholarly journals 1-Butanol absorption in poly(styrene-divinylbenzene) ion exchange resins for catalysis

Soft Matter ◽  
2015 ◽  
Vol 11 (47) ◽  
pp. 9144-9149 ◽  
Author(s):  
M. A. Pérez-Maciá ◽  
D. Curcó ◽  
R. Bringué ◽  
M. Iborra ◽  
F. Rodríguez-Ropero ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Resins ◽  
Styrene Divinylbenzene ◽  
Exchange Resins

scholarly journals 14C content in candu spent ion exchange resins and its release under alkaline conditions

Radiocarbon ◽  
2018 ◽  
Vol 60 (6) ◽  
pp. 1797-1808
Author(s):  
C Bucur ◽  
I Florea ◽  
P E Reiller ◽  
D Dumitrescu
Keyword(s):  
Ion Exchange ◽  
Gas Phase ◽  
Nuclear Power ◽  
Ion Exchange Resins ◽  
Dissolved Species ◽  
Alkaline Conditions ◽  
Naoh Solution ◽  
Ca Ions ◽  
Soluble Species ◽  
Exchange Resins

ABSTRACTThe total 14C content and its speciation (inorganic/organic) were measured in spent ion exchange resins (SIERs) received from Cernavoda Nuclear Power Plant (NPP). Also, 14C release from SIERs was investigated by desorption tests carried out in alkaline solution relevant for cementitious environment disposal. The method used for total 14C measurement consists of combustion in oxygen-rich atmosphere, while for speciation measurements, both in SIERs and in desorption solutions, an analytical method based on acid stripping and wet oxidation was applied. Around 97% from the total 14C inventory measured on the Cernavoda SIERs (33.7 kBq/g) was found to be in inorganic form and only 7% as organic 14C. Under alkaline conditions, 14C could be released both as gaseous and as soluble species: from the total 14C present in the SIERs samples around 7% was released as inorganic 14C in the gas phase and 79% as dissolved species (mainly as inorganic 14C). These percentages were obtained for unconditioned SIERs in NaOH solution. The SIERs will be immobilized in a suitable matrix for disposal, and the presence of Ca ions dissolved in cement pore water favor precipitation of 14C and consequently the amount of 14C released from disposal area should be lower.

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