Extraction of aromatic compounds from catalytic cracking light gas oil with nitromethane

Conclusions It has been shown that nitromethane can be used successfully for separating kerosene-gas oil fractions to obtain raffinates which satisfy the requirements for diesel fuel plus highly aromatized extracts which contain less than 6% of saturated hydrocarbons.Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 8, pp. 27–29, August, 1967.     

Structure and properties of the diamond–WC–6Co composite doped by 1.5 wt % of CrSi<Subscript>2</Subscript>

The influence of chromium and silicon on the structure of the diamond–WC–6Co composite doped by chromium disilicide has been studied at the meso-, micro-, and submicron levels. It is established that under the conditions of the structure formation of the diamond–WC–Co + CrSi₂ chromium and silicon do not dissolve in particles of diamond and WC carbide, they form a Co(W,C,Cr,Si) solid solution decreasing the energy of the stacking fault, which contributes to the Co_(fcc) → Co_(hcp) polymorphic transformation. Chromium interacts with atoms of carbon in diamond and WC carbide, as a result of which the graphite layer in the diamond/Co phase contact zone disappears and the Co₃W₃C carbide forms in the volume of the WC–Co-matrix. Chromium and silicon contribute to a good retention of diamond particles by the WC–Co-matrix and increase the ultimate strength in compression of the diamond–WC–Co+CrSi₂ composite.     

ION REDISTRIBUTION NEAR THE POLAR GROUPS IN THE LANGMUIR WETTING PROCESS

The theoretical analysis of electrostatic interactions and ion redistribution in the close vicinity of the three-phase contact line shows their important role in the Langmuir wetting process. To provide a sufficient rate for the ion transfer, which is intended to neutralize the interfacial charge, the concentration and potential distributions deviate from the equilibrium. As a consequence, during the deposition process the adhesion work, and hence the contact angle, are defined by the local ionic concentrations near the three-phase contact line. The concentration profiles and the electro-diffusion ion fluxes induced during the Langmuir wetting process are strongly dependent on the subphase composition and on the monolayer properties. The results of the analysis are in a good agreement with the experiments.     

The macroscopic model of the densification kinetics in the nonisothermic sintering of powders

The densification kinetics of a powder system has been described by a relatively simple analytical expression, which consists of only two dimensionless parameters. The first of them has been shown to be equal to the ratio between the maximum rate of the linear contraction and the total contraction of the sample multiplied by the time, for which the densification takes place; the second has been found to be equal to the ratio of the time required for the attainment of the maximum contraction velocity to the total densification time. The densification rate vs. time diagram is given by a curve having one or two maxima depending on values of the parameters entering the model. The study has been aimed at modeling the densification in sintering hard alloy mixtures.     

Boundary waves in ferromagnetically ordered two-dimensional arrays of magnetic dots

The existence of surface modes localized at the boundary of magnetic-dot arrays with magnetization perpendicular to the plane of array is predicted. Numerical and analytic calculations show that the excitation energy of these boundary modes is above the continuum of modes propagating in the array.     

Influence of residual solvent on physical and chemical properties of amorphous glassy polymer films

One of the most important areas of current research is the study of the influence of the prehistory of samples of amorphous glassy polymers on their physical and chemical properties. The study of structural changes by high temperature IR spectroscopy compared with of quantum chemical calculations allows for an understanding of the mechanism and nature of such processes. The changes in the structure of the polymer chain depending on the type of solvent used in the formation of the films are demonstrated using the examples of several different classes of polymers. In turn, the impact of such changes in the structure on the physical and chemical properties of the polymer films is demonstrated. © 2013 Society of Chemical Industry     

Experience with hot-briquetted iron at OAO Moldavskii Metallurgicheskii Zavod

The introduction of hot-briquetted iron in batch for steel smelting in arc furnaces is considered.     

Theoretical and experimental studies of the composition and reducibility of the dust from arc steel-melting furnaces

The chemical and mineralogical composition of the dust from electric gas-cleaning filters of the steelmaking furnaces at the Moldavian metallurgical works is studied. The conditions of effective removal of zinc and lead from the ASF gas-cleaning dust are determined.