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Pokonova Yu.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2014

A new type of the latent reactivity of petroleum asphaltites, which manifested itself under the action of γ-radiation, was determined. γ-Radiation facilitates the conversion of the asphaltites into macromolecular initiators onto which the macromolecular chains of styrene, methyl methacrylate, and acrylic acid are grafted. Based on this new type of reactivity, phosphoric acid cation exchangers and multifunctional cation exchangers were synthesized using the most environmentally appropriate non-power-consuming wasteless method. © 2014 Allerton Press, Inc.


Pokonova Yu.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2011

The use of a solution of total shale phenols, furfural, and Thiokol with various filling materials makes it possible to prepare polymer concrete with a strength to 75 MN/m2 and a heat resistance to 300°C. © Allerton Press, Inc., 2011.


Pokonova Yu.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2013

Ampholytes with a static exchange capacity of 3.5-6.6 mg-equiv/g for 0.1 N H2SO4 or 1.3-2.0 mg-equiv/g for 0.1 N NaOH were obtained from shale phenols (a mixture of alkylresorcinols) by polycondensation with polyethylenepolyamines and furfural. The interaction of shale phenols with hexamethylentetramine resulted in polycondensation products, which gave polyfunctional cation exchangers with a capacity of up to 7.5 mg-equiv/g upon a radiation exposure with acrylic acid. Carbon adsorbents based on the polycondensation products of shale phenols (ampholytes) prepared in an industrial process exhibited developed microporosity (Vmi = 0.28-0.30 cm3/cm3) and a considerable concentration of heteroatoms (to 16%). This made it possible to obtain adsorbents whose sorption capacity and selectivity in the extraction of gold from multicomponent solutions are twice as high, as compared with those of a KAD-iodine commercial sorbent. © 2013 Allerton Press, Inc.


Pokonova Y.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2013

The specific features of the thermal and radiation-induced structurization and simultaneous destruction processes of compounds from shale phenols containing water-saturated fillers (radiation-active ion exchangers) were studied. The empirical time dependence of the strength of hardened blocks was found, which made it possible to recommend operating conditions without significant changes in the physicomechanical properties. © 2013 Allerton Press, Inc.


Pokonova Y.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2013

Carbon adsorbents from shale oil were modified in 0.01-0.1 N solutions of NaOH in propanol at 20-25 C by a nondestructive low-power-consuming method using γ-radiation at a dose of 4.5 × 105 Gy. The adsorbents acquired ion-exchange properties (exchange capacity to 3.28 mg-equiv/g) upon irradiation. The activated adsorbents had an increased sorption activity toward ethyl chloride. © 2013 Allerton Press, Inc.


Pokonova Y.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2012

The liquid products of shale conversion-shale oil and shale phenols (a mixture of alkylresorci-nols) and their solutions in commercial furfural, which are used as a new binding agent-make it possible to form carbon adsorbents with high mechanical strength (to 97%), microporosity (to 0.70 cm3/g), and higher sorption capacity than that of industrial adsorbents. The medium-combustion-loss samples exhibited higher selectivity in the extraction of noble metals from the multicomponent polymetallic solutions than those formed of traditional wood tar. They also outperform industrial adsorbents in these characteristics. It is pos-sible to apply them to the absorption and concentration of aromatic hydrocarbons and to use them at atomic power plants, transport, and air conditioning plants for food and vegetable storage. © 2012 Allerton Press, Inc.


Pokonova Y.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2012

Based on a composition of shale phenols filled with 60 wt % sand, the building material that can be used as masonry mortar and repair material was obtained. It had adhesion to concrete and metal (steel 3) of 1.6-1.7 and 2.4-3.6 MPa, respectively, and a bending strength of 10.0-10.8 MPa. This material can be exploited under the conditions of northern regions: it is waterproof, frost-resistant, wearproof, and resistant to alternating temperatures. © 2012 Allerton Press, Inc.


Pokonova Y.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2012

Quartz sand can be impregnated with an impregnant that consists of a solution of shale phenols in furfural. In this case, modified filler, which has a high water resistance coefficient, is obtained. High-quality road-building asphaltic concrete, whose properties outperform GOST (State Standard) requirements, can be prepared on this basis. © Allerton Press, Inc., 2012.


Pokonova Yu.V.,NPKF Yuvalen
Solid Fuel Chemistry | Year: 2012

Spent zeolites from petroleum refining processes can be used for the extraction and concentration of toxic elements (As, Pb, and Hg) from wastewater because they possess a better sorption capacity in comparison with that of the KAD-iodine commercial sorbent intended for the purification of wastewater. The amounts of arsenic and mercury concentrated on zeolite surfaces for 120 h were greater than their amounts in the purified wastewater by factors of 4 and 16, respectively. The degree of removal of the cesium-137 radionuclide from wastewater by spent zeolites was higher by two orders of magnitude than those for natural sorbents and the BAU carbon adsorbent, and this value for 60Co was higher by an order of magnitude. © Allerton Press, Inc., 2012.

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