Oligomerization of propane-propylene fraction on a chloroaluminum complex

An attempt was made to use the industrial propane-propylene fraction (PPF) with ∼75% propylene to obtain its oligomers. The studies were conducted on a periodic pilot unit in a wide temperature and time range in solvent medium at different concentrations of the chloroaluminum complex. It was shown that without changing the composition of PPF, a line of products that satisfy the requirements for bases for different oils and __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 41–43, May–June, 2006.     

A technique of water treatment from oil pollutants

A new technique of water treatment from oil and oil products using a highly effective adsorbent has been developed. A composition was proposed for producing the adsorbent made of oligocyclopentadiene with molecular weight 4000–5000 and a 5% solution of polynorbornyl acrylate. It has been proved that using this adsorbent we can extract 5–7 wt% of oil from the water surface.     

Kinetic model of hydrogenation of propylene oligomers

The kinetic mechanisms of hydrogenation of propane-propylene fraction oligomers on a platinum-containing catalyst were investigated at different temperatures and pressures. The kinetic model developed adequately describes the experimental data. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 29–30, November–December, 2006.     

Non-equilibrium charge carrier dynamics in synthetic diamond studied by the μSR-method

Polarized negative muons were used to study the dynamics of non-equilibrium charge carriers in diamond. From the behavior of the muon polarization it is concluded that the acceptor center _μB in diamond is formed in the diamagnetic state (with the probability close to unity) and then, by capturing a hole, turns to the paramagnetic state. The hole capture rate by an ionized acceptor center _μB⁻ in synthetic diamond was found to depend on temperature as 1/T^α, where α = (1.5–2.5) at T > 80 K.     

Fabrication and properties of an n-ZnO:Ga/p-GaN:Mg/α-Al2O3 heterojunction

Semiconductors - The first results of growing ZnO/GaN/α-Al2O3 heteroepitaxial structures in a low-pressure flow-through reactor using chemical-vapor deposition and stimulation with a plasma of...     

Development of a technology of compaction of increased-density parts using gas drainage methods

The influence of the amount and dispersion of technological lubricant (zinc stearate) and solid lubricants (talc, graphite, calcium fluoride) as well as the sintering temperature and time on the physical and mechanical properties of sintered iron is studied. When the stock contains no technological lubricant the porosity of the specimens drops to 5.0–5.2% but their strength is substantially greater than that of SP10 and SP30 steels of the same porosity. The strength of the specimens is highest when the iron powder has the smallest grain size. Solid lubricants in the stock result in the pressed iron-powder parts having poorer mechanical properties, although they do act in part as technological lubricants during compaction. Favorable results may be obtained by complex alloying of the stock, i.e., the simultaneous introduction of several solid lubricants.     

Determination of the time of accelerated tests of reduction gears for pumping jacks

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 4, pp. 7–9, April, 1989.