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Trukshin I.G.,Prikladnaya Khimiya Russian Scientific Center | Barabanov V.G.,Prikladnaya Khimiya Russian Scientific Center | Novgorodov V.N.,Prikladnaya Khimiya Russian Scientific Center | Zirka A.A.,RAS Boreskov Institute of Catalysis | And 3 more authors.
Catalysis in Industry | Year: 2010

Industrially important reactions of gas-phase synthesis of ozone-safe freons of the ethane family-hydrofluorination of perchloroethylene into pentafluoroethane (Halocarbon-125) and trichloroethylene into 1,1,1,2-tetrafluoroethane (Refrigerant-134a) on an Cr-Mg catalyst were investigated for to improve the Russian industrial Cr-Mg catalyst for freon production. The influence of reaction conditions-temperature, contact time, pressure, etc.-on the rate and selectivity of reactions was studied. The mechanism of reactions is discussed on the basis of the dependences obtained with regard to multistage nature of processes. The computational method for assessing the optimal content of the active component and specific surface were used. The optimal content of the active component and catalyst activity were shown to increase with increasing specific surface of the support, MgF 2. Thus, an increase in the specific surface of MgF2 from 100 to 200 m2/g may result in increased activity by a factor of almost 2. However, obtaining such highly disperse MgF2 is difficult; moreover, the catalyst would be poorly thermostable. Therefore, the possibilities of considerable enhancing the activity of industrial Cr-Mg catalysts are limited by the existing technology. Significant enhancement in the properties of the catalyst of gas-phase synthesis of freons is possible upon a change in the method of preparing the catalyst and the chemical composition of the support. © 2010 Pleiades Publishing, Ltd. Source


Bal'Tser A.E.,Prikladnaya Khimiya Russian Scientific Center | Zubritskaya N.G.,Prikladnaya Khimiya Russian Scientific Center | Zaitsev D.A.,Prikladnaya Khimiya Russian Scientific Center | Bazanov A.G.,Prikladnaya Khimiya Russian Scientific Center | And 3 more authors.
Russian Journal of Applied Chemistry | Year: 2015

Effect of various technological parameters of the process in which wastewater formed in production of bisphenols is purified to remove phenol. The optimal parameters of the process were determined, with which a processed wastewater is obtained with phenol concentration that enables recycling of wastewater into the technological process and its partial delivery to treatment facilities. © 2015 Pleiades Publishing, Ltd. Source


Kozlova O.V.,Prikladnaya Khimiya Russian Scientific Center | Tereshchuk L.S.,Prikladnaya Khimiya Russian Scientific Center | Myznikov A.V.,Prikladnaya Khimiya Russian Scientific Center | Obraztsova A.V.,Prikladnaya Khimiya Russian Scientific Center | And 4 more authors.
Russian Journal of Applied Chemistry | Year: 2015

Effect of fabrication conditions on the physicochemical and catalytic properties of catalysts based on cation-exchange resins was studied. It is shown that the porous structure and surface texture, mechanical and osmotic characteristics of both gel-like and macroporous ion exchangers are determined by the content of divinylbenzene in the copolymer. Effective ways to raise the activity of the catalysts were found. © 2015 Pleiades Publishing, Ltd. Source

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