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Pokonova Yu.V.,St Petersburg Technological Institute Technical University
Solid Fuel Chemistry | Year: 2011

Radiation-resistant cation exchangers with a static exchange capacity to 5.91 mg-equiv/g and a mechanical strength to 95% were prepared based on a grafted copolymer of asphaltite and acrylonitrile. The adsorbents prepared in accordance with an industrial process using a charge mixture containing the copolymer exhibited higher sorption properties, as compared with those of the commercial adsorbent SKT, in the sorption of silver from multicomponent polymetallic solutions. The selectivity factor for silver was 3.55, as compared with 1.85 for SKT. © 2011 Allerton Press, Inc. Source


Pokonova Yu.V.,St Petersburg Technological Institute Technical University
Solid Fuel Chemistry | Year: 2011

The chloromethylation reaction of an asphaltite and styrene graft copolymer followed by the amination of the chloromethylated products was optimized. New strongly basic anion exchangers with an exchange capacity of 2.5 mg-equiv/g and a mechanical strength of 93% were prepared. © Allerton Press, Inc. 2011. Source


Pokonova Yu.V.,St Petersburg Technological Institute Technical University
Solid Fuel Chemistry | Year: 2011

A phosphoric acid cation exchanger having an exchange capacity of 3.5 mg-equiv/g and a mechanical strength of 95% was prepared based on a graft copolymer of asphaltite and styrene using chloromethylation and then phosphorylation reactions. A number of metal chloride catalysts and the reaction kinetics of phosphorylation were studied. It was found that the resulting phosphoric acid cation exchangers are more stable than analogous commercial materials. © Allerton Press, Inc., 2011. Source


Pevzner L.M.,St Petersburg Technological Institute Technical University
Russian Journal of General Chemistry | Year: 2013

Alkyl cyanofurylmethanephosphonates are formylated with ethyl formate in the presence of sodium foil to form sodium derivatives of phosphonoacetic aldehyde. If phosphonoacetic aldehyde and nitrile groups occupy remote positions in the furan ring, the sodium derivative in DMSO solution exists in the form of carbanion carrying charge on the carbon atom adjacent to the aldehyde group. If the substituents are located at the adjacent carbons of furan ring, the solution equilibrium between the carbanionic (major product) and Z-enolate forms of salts is established. Alkylation of the formed salts with methyl iodide occurs exclusively at the oxygen atom to give methyl enolates. In most cases, a mixture of E-and Z-isomers is formed, the E one being prevailing. In the case of 2,5-location of the substituents in furan ring, the sodium salt is inactive, and the alkylation does not occur. © 2013 Pleiades Publishing, Ltd. Source


Bogdanov S.P.,St Petersburg Technological Institute Technical University
Glass Physics and Chemistry | Year: 2013

The article represents the possibilities of the iodine-transport method as a technique for intensifying the chemical reaction between solid-phase reagents. The prospects are shown for a decrease in the temperature and an increase in the rates of reactions like the synthesis of compounds from elements and the reduction of oxides using the iodide transport. © 2013 Pleiades Publishing, Ltd. Source

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