Petroleum Chemistry (v.51, #6)

The chemical composition of crude oils from five fields of Volgograd oblast has been studied. It has been shown that predicting the low-temperature properties of oil and for selecting asphaltene-resin-paraffin deposition inhibitors requires a more profound knowledge of the hydrocarbon composition of oil in addition to the structural-group composition. The presence of produced water in the produced well fluid increases the amount of asphaltene-resin-paraffin deposits.

Asphalt-resin-paraffin sediments of the Aganskoe oilfield by D. V. Nelyubov; D. A. Vazhenin; A. N. Petelin (401-404).
The physicochemical properties of asphalt-resin-paraffin (ARP) sediments from the Aganskoe oilfield have been studied, and their chemical compositions have been determined in comparison with ARP sediments of another well of the same field and ceresin. The necessity of determining the physicochemical properties of ARPs for effective control of their deposition in oil-well tubing has been shown.

New functionally substituted polyammonium compounds that involve polar oxygen-containing fragments have been synthesized. It has been found that these compounds, which are introduced into epoxy polymers, are hydrophilizing agents that decrease the deposition of asphaltene-resin-paraffin substances from oil on the polymer surface.

Processes for manufacturing synthesis gas, one of the most important high-volume products of gas chemistry, have been briefly surveyed. Trends in the development of catalysts and technologies used in the process have been shown. One of the most promising in terms of engineering design, cost, and safety is that based on the oxidative conversion of lower alkanes into synthesis gas with a circulating microspherical heterogeneous metal oxide contact. Experimental methods and devices for studying heterogeneous contacts and designing the process technology have been proposed. By the example of microspherical Ni-Co metal oxide heterogeneous contact, it has been shown that the proposed methods and setups provide extensive information and are useful for studying synthesis gas manufacturing in a system with separate feedstock and oxidant supply to the reaction and regeneration zones, respectively.

Foil-supported Rh/γ-Al2O3 and Pt/γ-Al2O3 catalysts for carbon dioxide methane reforming by S. I. Serdyukov; I. I. Karpov; G. S. Drobakha; V. K. Bel’nov; S. L. Levchenko; M. S. Safonov (418-425).
Rh/γ-Al2O3 and Pt/γ-Al2O3 catalysts supported on a metal foil surface have been studied in the carbon dioxide reforming of methane. The stability and activity of platinum and rhodium catalysts with different compositions have been determined. The kinetic function parameters have been found by solving the inverse problem. It has been shown that the 0.06% rhodium catalyst is the most active; its activity is more than two orders of magnitude higher than that of the nickel-chromium catalyst studied earlier.

The synthesis of suspensions of nanoparticles of molybdenum and aluminum oxides from inverted microemulsions with a dispersion medium composed of paraffin and aromatic hydrocarbons has been studied. The thermal decomposition of the precursors of catalyst components (water-soluble salts of Mo and Al) has been examined by thermogravimetric analysis and differential scanning calorimetry. The nature of the effect of the parameters of inverted microemulsions and conditions of their treatment on the particle size in the target Al- and Mo-containing suspensions has been revealed. The dispersity and composition of the resulting suspensions of nanosized particles have been analyzed.

The telomerization of 1Z,5Z-cyclooctadiene with halogenated methanes (CCl4, CBrCl3, CHCl3, CH2Cl2) mediated by chromium, copper, and molybdenum complexes has been investigated. It has been shown that the use of water as a nucleophilic additive promotes the formation of 1,4- and 1,5-epoxycyclooctanes and anti-8-(trichloromethyl)bicyclo[3.2.1]octan-exo-2-ol.

The kinetics of the selective ethylene oligomerization reaction on the chromium(III) ethylhexanoate-Al(C2H5)3-2,5-dimethylpyrrol homogeneous catalytic system in the presence of CCl4 has been studied. The reaction rate order in ethylene, the activation energy, and the selectivity of reaction for 1-hexene have been determined.

Ethylene epoxidation under the effect of gas phase thermal oxidation of methane by R. R. Grigoryan; S. D. Arsentev; A. A. Mantashyan (448-453).
The process of ethylene epoxidation under the effect of gas phase thermal oxidation of methane has been studied. It was shown that if methane oxidation is carried out in the first section of two-sectional reactor and ethylene is injected into the second section then epoxidation occurs as a result of interaction of ethylene and peroxy radicals generated by methane oxidation reaction. The dependence of ethylene oxide accumulation rate on methane/oxygen ratio in the first section of reactor as well as flow velocity and temperatures in the first and second sections has been studied. The results show that in the second section of the reactor the ethylene epoxidation takes place trough C2H4 + RO 2 · → C2H4O + RO reaction.

Synthesis, structure, and properties of new antioxidants based on hydroxypropylated p-aminodiphenylamine by N. I. Ionova; D. N. Zemskii; B. R. Sadykov; S. V. Goryainov; G. A. Kalabin (454-457).
The reaction of propylene oxide with p-aminodiphenylamine has been studied, the structure of the products has been determined, and their potential use as effective antioxidants has been discussed.

Perchloric acid in a tert-butanol solution with 10 vol % chlorobenzene exhibits an almost three orders of magnitude higher activity in comparison with para-toluenesulfonic acid (TSA) as a catalyst for the parallel styrene epoxide (SE) heterolysis and homolysis processes. There is a substantial difference between the reactions mediated by these catalysts: rate curves for the overall consumption in the presence of perchloric acid (SE heterolysis) yield straight lines in the log [SE]-time coordinates, but the first-order rate constant drops with an increase in [SE]. However, the oxygen uptake rate increases with [SE]. In the case of TSA, neither overall consumption nor oxidation rate depended on [SE] at [SE] > [TSA]; i.e., the reaction was zeroorder in SE.

A number of new derivatives of N-benzylarylamines and diphenyl α-aminomethanephosphonates have been synthesized, and their structure has been established by IR and 1H NMR spectroscopy. It has been shown that these compounds can be used as effective additives enhancing the thermooxidative stability of ester-based oils.

Aminomethoxy derivatives of 1-benzylthiohexane as antimicrobial additives for lubricating oils by E. G. Mamedbeili; I. A. Dzhafarov; K. A. Kochetkov; T. G. Kyazimova; Kh. I. Gasanov; I. M. Mamedova (469-472).
New 2-aminomethoxy derivatives of 1-benzylthiohexane have been obtained via the Mannich condensation reaction of 1-benzylthiohexan-2-ol with formaldehyde and secondary amines. The structure of the synthesized compounds has been established by IR and 1H NMR spectroscopy and mass spectrometry. The compounds have been tested as antimicrobial additives for lubricating oils and bacteria- and fungi-killing antiseptic agents. It has been found that they effectively suppress the vital activity of microorganisms.