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Article
The Ryabinovoe Porphyry Cu–Au Deposit (Southern Yakutia): Geology, Wallrock Alteration, Noble Gases Isotope Systematics and Isotopic Dating of Mineralization Processes
In the territory of the Ryabinovoe porphyry copper-gold deposit, ore mineralization is confined to multi-stage metasomatism fields, which were formed in two stages. At the first, pre-ore stage, high-temperatur...
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Article
Erratum to: Geochemistry and Petrography of Hydrothermally Altered Rocks of the Ryabinovoe Orefield (Southern Yakutia) as the Basis for the Prediction of Gold–Copper-Porphyry Ore Mineralization
An Erratum to this paper has been published: https://doi.org/10.1134/S1075701523370018
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Article
Shrinkage of Glaciers in Eastern Altai (Shapshal Center) after the Little Ice Age Maximum
Glaciers of the little-studied Shapshal Glaciation Center in Eastern Altai during the Little Ice Age maximum have been reconstructed and the pattern of their subsequent reduction has been analyzed. The shrinka...
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Article
Geochemistry and Petrography of Hydrothermally Altered Rocks of the Ryabinovoe Orefield (Southern Yakutia) as the Basis for the Prediction of Gold–Copper-Porphyry Ore Mineralization
The results are discussed of a predictive appraisal of porphyry gold–copper mineralization within the Ryabinovoe orefield that is based on a comprehensive approach to studying petrographic and geochemical char...
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Article
Extraction of Phenol from Wastewaters. Choice of Extractant in Coproduction of Phenol and Acetone (Review)
A comparative analysis of the effectiveness of various organic extractants (ethers, acetates, ketones, and alcohols) in phenol extraction from aqueous solutions is given. The differences in the phenol distribu...
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Article
The First Data on the U–Pb Ages and Compositions of Zircons from Ore-Bearing Syenites of Gora Rudnaya (South Yakutia)
This paper presents the first isotope-geochemical study (SHRIMP-II, SIMS) of zircons from syenites of Gora Rudnaya (South Yakutia), which host the recently discovered Morozkinsky gold deposit. Gora Rudnaya is ...
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Article
Alkylation of Phenol with tert-Butanol in a Draining-Film Reactor
Alkylation of phenol with tert-butanol in a displacement draining-film reactor on a heterogeneous catalyst, Beta zeolite, was studied. Optimum process conditions ensuring the maximal p-tert-butylphenol yield were...
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Article
Geocryological and Hydrogeological Conditions of the Western Part of Nordenskiold Land (Spitsbergen Archipelago)
This work summarizes the archived data of geocryological and hydrogeological conditions in the west of Nordenskiold Land on the Spitsbergen Archipelago. The historical data obtained in the Soviet period during...
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Article
Perspectives of the Reduction of Nutrient Export from River Watersheds through the Introduction of Best Available Technologies for Agricultural Production: Based on Modeling Results
Estimate is made for the possible reduction of nutrient export from the drainage basins of tributaries of the Kuibyshev Reservoir through the introduction of the best available technologies of agricultural pro...
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Article
New data on the postglacial development of Narva-Luga Klint Bay (Eastern Gulf of Finland): results of geoarchaeological research
This paper presents the first results of geological and geoarchaeological multi-proxy studies conducted from 2012 to 2017 in the northern part of Narva-Luga Klint Bay (between the Kurgalov and Kurovitski Plate...
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Article
Estimation of Nutrient Load on the Kuibyshev Reservoir From the Catchment Area
The present level of external nutrient load and its separate parts on the Kuibyshev reservoir — the largest one on the Eurasian continent, was estimated. The mathematic model for calculating mean annual input ...
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Article
Technologies for Processing of Crude Glycerol from Biodiesel Production: Synthesis of Solketal and Its Hydrolysis to Obtain Pure Glycerol
Information on the volume of production of biodiesel and crude glycerol from it is analyzed. The possibility of using crude glycerol as a feedstock for preparing solketal is demonstrated. The specific features...
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Article
Kinetics of the Formation of Solketal in the Presence of Sulfuric Acid
The kinetics of reversible solketal synthesis in the presence of sulfuric acid as a catalyst is studied. The parameters of kinetic equations describing direct and reverse reactions are found.
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Article
Composite Materials: Properties of Polymeric Matrix Based on Epoxy Resin and Monoepoxide Diluent, p-tert-Butylphenol Glycidyl Ether
Brief information is presented about the state of the world and domestic market of composite materials and epoxy resins as raw materials for polymeric matrices. It is shown that facilities for manufacture of e...
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Article
Fertility of Rare-Metal Peraluminous Granites and Formation Conditions of Tungsten Deposits
The tungsten distribution in rocks of the Kukulbei Complex in eastern Transbaikal region results in a high potential of rare-metal peraluminous granites (RPG) for W mineralization and displays a different beha...
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Article
Selecting an optimum catalyst for producing para-tert-butylphenol by phenol alkylation with tert-butanol
Results of testing various heterogeneous catalysts in the synthesis of p-tert-butylphenol via phenol alkylation with tert-butyl alcohol are presented. It has been shown that all other conditions being equal, zeol...
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Article
Choice of a catalyst and technological scheme for synthesis of solketal
Results are presented obtained in tests of various homogeneous and heterogeneous catalysts in a synthesis of solketal (2,2-dimethyl-4-hydroxymethyl-1,3-dioxolane). It is shown that, all other conditions being ...
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Article
Preparation of porous materials from a leucoxene concentrate
We have studied the effect of leaching conditions on the physicochemical characteristics of titanium dioxide-based powders prepared by leaching a leucoxene concentrate from the Yaregskoe deposit. The results d...
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Article
Recovery of solketal from reaction products by extraction
The extraction of solketal from aqueous glycerol with AI-92 gasoline, toluene, hexane, and 1-hexene was studied. Aromatic compounds and mixtures containing them exhibit the best extracting properties. A flowsh...
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Article
Specific features of solketal synthesis on KU-2-8 cation-exchange resin
Technological specific features of the solketal synthesis on a KU-2-8 cation-exchange resin were improved. Data are presented on the mutual solubility of the components in the glycerol–acetone–water and glycer...
