scholarly journals Bifunctional Cr3+ modified ion exchange resins as efficient reusable catalysts for the production and isolation of 5-hydroxymethylfurfural from glucose

RSC Advances ◽  
2017 ◽  
Vol 7 (13) ◽  
pp. 7555-7559 ◽  
Author(s):  
Joao M. J. M. Ravasco ◽  
Jaime A. S. Coelho ◽  
Svilen P. Simeonov ◽  
Carlos A. M. Afonso
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Reaction Medium ◽  
Ammonium Bromide ◽  
Ion Exchange Resins ◽  
Bifunctional Catalysts ◽  
Cation Exchange Resins ◽  
Exchange Resins

Cr3+ modified readily available cation exchange resins were prepared and explored as heterogeneous bifunctional catalysts for dehydration of glucose to 5-hydroxymethylfurfural (HMF) in tetraethyl ammonium bromide (TEAB)/water as reaction medium.

Studies on ion-exchange resins. Capacity of sulfonic acid cation-exchange resins

1951 ◽  
Vol 6 (1) ◽  
pp. 20-32 ◽  
Author(s):  
Harry P Gregor ◽  
J.I Bregman ◽  
Fradelle Gutoff ◽  
Robert D Broadley ◽  
David E Baldwin ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Sulfonic Acid ◽  
Ion Exchange Resins ◽  
Cation Exchange Resins ◽  
Acid Cation ◽  
Exchange Resins

Thermodynamtc investigation of ion-exchange sorption of oxytetracycline with sulfo cation-exchange resins having a surface sorbing layer

1975 ◽  
Vol 9 (12) ◽  
pp. 783-787
Author(s):  
G. V. Samsonov ◽  
T. V. Atabekyan ◽  
O. P. Kolomeitsev ◽  
V. Ya. Vorob'eva
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Cation Exchange Resins ◽  
Exchange Resins

Proton magnetic resonance studies of ionic solvation in ion-exchange resins.: Part I. Sulfonated cation-exchange resins

1970 ◽  
Vol 48 (6) ◽  
pp. 917-923 ◽  
Author(s):  
T. E. Gough ◽  
H. D. Sharma ◽  
N. Subramanian
Keyword(s):  
Magnetic Resonance ◽  
Chemical Shift ◽  
Ion Exchange ◽  
Temperature Dependence ◽  
Cation Exchange ◽  
Proton Magnetic Resonance ◽  
Resin Matrix ◽  
Strong Electrolyte ◽  
Cation Exchange Resins ◽  
Exchange Resins

The proton magnetic resonance spectra of cation-exchange resins of crosslinkage X1 to X16 in the H+, Li+, Na+, K +, Rb+, Cs+, and NH4+ forms have been recorded and the values of the molal chemical shift, δM+0, are found to be −0.321, −0.005, 0.041, 0.031, 0.028, 0.015, and 0.00 (assumed) p.p.m./mole, respectively, for the cations. These values are very nearly equal to those observed in corresponding aqueous solutions, indicating that ion–solvent interactions are similar in both the resin matrix and the aqueous solution. The temperature dependence of the chemical shift shows the same trend. The effective hydration numbers calculated from the temperature dependence are 2.0 (4.81 m) for the H+ form, 4.8 (3.25 m) and 3.6 (5.26 m) for the Na+ form, 4.4 (3.9 m) for the K+ form, and 2.4 (6.18 m) for the Cs+ form. The ions in the resin phase behave as solutions of strong electrolyte, which is consistent with the polyelectrolyte gel model for the ion-exchange resin.

scholarly journals Use of ion exchange resins for tartrate wine stabilization

OENO One ◽  
2006 ◽  
Vol 40 (4) ◽  
pp. 223 ◽  
Author(s):  
Helena Mira ◽  
Patricia Leite ◽  
Jorge Manuel Ricardo-da-Silva ◽  
António Sérgio Curvelo-Garcia
Keyword(s):  
Ion Exchange ◽  
Organic Acid ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Acid Composition ◽  
Previous Treatment ◽  
Ion Exchange Resins ◽  
Anion Exchange Resins ◽  
Exchange Resins

<p style="text-align: justify;">The application of the cation exchange and double cation-anion exchange resins, regarding the wine tartrate stabilization, without previous treatment of wine by cold has been studied as well as their influence in phenolic, mineral and organic acid composition. The R1 resin was used in Mg2+, Na+ and H+ form, the R2 resin was always used in H+ form, and the R3 was used in OH- form. The eluted wine was assembled with untreated wine to obtain stable wine. The R2 resin showed to be more efficient to enhance the tartrate stabilization than R1 in Mg2+ form; however in H+ form, the behaviour of both resins was quite similar. The tartrate stabilization results to double cation anion exchange were similar to the results obtained with cation exchange.</p>

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