Influence of the Composition of the Sulfuric Acid Cation Exchanger on the Efficiency of Chromatographic Purification of Petroleum Vanadyl Porphyrins

2020 ◽  
Vol 93 (6) ◽  
pp. 888-896
Author(s):  
N. A. Mironov ◽  
D. V. Milordov ◽  
E. G. Tazeeva ◽  
G. R. Abilova ◽  
D. I. Tazeev ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Cation Exchanger ◽  
Chromatographic Purification ◽  
Acid Cation

scholarly journals Amphiphilic Biaryl Monophosphine Ligands by Regioselective Sulfonation

2020 ◽  
Author(s):  
Jacob Rodriguez ◽  
Heemal Dhanjee ◽  
Stephen L. Buchwald
Keyword(s):  
Sulfuric Acid ◽  
Chromatographic Purification ◽  
Organometallic Reactions ◽  
One Step ◽  
High Yields

<div> <p>Amphiphilic ligands are valued for their ability to facilitate organometallic reactions in the presence of water. The regioselective sulfonation of a series of commercially available biaryl monophosphines to generate amphiphilic ligands is presented. In this one-step protocol, the temperature and addition of fuming sulfuric acid were carefully controlled to arrive at sulfonated biaryl monophosphine ligands in high yields with >95% regioselectivity without the need for chromatographic purification.</p> </div>

scholarly journals Titanite Ores of the Khibiny Apatite-Nepheline-Deposits: Selective Mining, Processing and Application for Titanosilicate Synthesis

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 446 ◽  
Author(s):  
Lidia Gerasimova ◽  
Anatoly Nikolaev ◽  
Marina Maslova ◽  
Ekaterina Shchukina ◽  
Gleb Samburov ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Cation Exchanger ◽  
Flow Diagram ◽  
Titanyl Sulfate ◽  
Process Flow Diagram ◽  
Flotation Cells ◽  
Selective Mining ◽  
Order Of Magnitude ◽  
Sulfuric Acid Method ◽  
Concentrated Sulfuric Acid

Geological setting and mineral composition of (apatite)-nepheline-titanite ore from the Khibiny massif enable selective mining of titanite ore, and its processing with sulfuric-acid method, without preliminary concentration in flotation cells. In this process flow diagram, titanite losses are reduced by an order of magnitude in comparison with a conventional flotation technology. Further, dissolution of titanite in concentrated sulfuric acid produces titanyl sulfate, which, in turn, is a precursor for titanosilicate synthesis. In particular, synthetic analogues of the ivanyukite group minerals, SIV, was synthesized with hydrothermal method from the composition based on titanyl-sulfate, and assayed as a selective cation-exchanger for Cs and Sr.

Uptake of phenylalanine and tyrosine by a strong-acid cation exchanger

AIChE Journal ◽  
1989 ◽  
Vol 35 (1) ◽  
pp. 53-68 ◽  
Author(s):  
Malcolm S. Saunders ◽  
John B. Vierow ◽  
Giorgio Carta
Keyword(s):  
Cation Exchanger ◽  
Strong Acid ◽  
Acid Cation

scholarly journals STUDY OF THE EFFICIENCY OF SORPTION TREATMENT WATER FROM AMMONIUM IONS ON NATURAL AND ARTIFICIAL SORBENTS

2017 ◽  
pp. 42-48
Author(s):  
I.N. Makarenko ◽  
I.N. Trus ◽  
A.I. Petrychenko ◽  
A.Yu. Kiichenko
Keyword(s):  
Calcium Ions ◽  
Cation Exchanger ◽  
Tap Water ◽  
Acid Solutions ◽  
Ammonium Ions ◽  
Ion Concentrations ◽  
Model Solutions ◽  
Hydrochloric Acid Solutions ◽  
Cation Exchangers ◽  
Acid Cation

It was studied processes of ion-exchange water purification from ammonium ions from model solutions on cation exchangers and on zeolite. It was established dependencies ammonium sorption on the form of ion exchanger, the ratio of ammonium and calcium in water and the level of ion concentrations in solution. It was shown that the strongly acid cation exchanger KU-2-8 in Na+-form has a low selectivity for ammonium ions, in comparison with the H+-form. It was established that the sorption efficiency of ammonium ions on cation exchangers KU-2-8 and Dowex Mac-3 decreases in the presence of calcium ions. It was determined that regeneration of cation exchanger KU-2-8 was more effective when hydrochloric acid solutions were used. It was shown that ammonium sorption on zeolite from tap water goes in the same way as from model solutions. It was determined the boundary capacity of the zeolite for ammonium ions and it was amounted 40 mg/g. The regeneration of zeolite with a sodium chloride solution was investigated and it was established that the degree of regeneration reached 100 %. Bibl. 16, Fig. 6, Tab. 1.

Sorption of Pyridine-3-carboxylic Acid by Fe-Containing Sulfonic Acid Cation Exchanger KU-2

2021 ◽  
Vol 95 (8) ◽  
pp. 1585-1590
Author(s):  
G. N. Altshuler ◽  
E. V. Ostapova ◽  
O. G. Altshuler
Keyword(s):  
Carboxylic Acid ◽  
Sulfonic Acid ◽  
Cation Exchanger ◽  
Acid Cation

The ion exchange equilibria of Na+/K+ in nonaqueous and mixed solvents on a strong acid cation exchanger

2002 ◽  
Vol 57 (11) ◽  
pp. 1943-1954 ◽  
Author(s):  
Antonio de Lucas ◽  
Jose L. Valverde ◽  
Maria C. Romero ◽  
Julian Gómez ◽  
Juan F. Rodrı́guez
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Mixed Solvents ◽  
Strong Acid ◽  
Acid Cation
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