3-dinitrobenzoylhydrazones of organosilicon carbonyl compounds

Conclusions The reaction of 3,5-dinitrobenzoylhydrazide with organosilicon aldehydes and ketones was investigated. It was shown that this reagent forms readily crystallizing 3,5-dinitrobenzoylhydrazones and is suitable for the identification of organosilicon carbonyl compounds.     

Interaction of polyesters with epoxy polymers: Insertion of oxirane rings into ester bonds

Epoxy oligomers readily interact (hardening) with polyesters of different structures (heterochain, carbochain, aliphatic, aromatic), as indicated by the change of properties and infrared spectra of an epoxy polymer–polyester composition on heating. The curing is caused by the reaction of the oxirane ring with ester groups and proceeds by the mechanism of “insertion” of the fragment of the oxirane cycle into the ester bond without scission of the molecular chain of polyesters. This mechanism of interaction is confirmed by study of a model reaction of phenyl benzoate with phenylglycide ether to lead to the formation of 1,3-diphenyl ether of 2-benzoyl glycerine. The latter was also produced by another way. The reaction of polyarylate with phenylglycide ether confirmed also that interaction of the ester group with the oxirane ring proceeds by the mechanism of “insertion.” This interaction proceeds with a high conversion and without rupture of the macromolecules (molecular weight does not decrease). The reaction of the oxirane ring with the ester group is accelerated in the presence of sodium salts of carboxylic acids, carbonic acid, and sodium phenolates.     

Reaction of o-phenylenediamine with α-bromoacetylenic ketones

Conclusions 1,2-Di-(acylethynylaza)benzenes and 2-acylmethylenebenzo-1,3-imidazoline hydrobromides were obtained by the reaction of o-phenylenediamine with-bromoacetylenic ketones.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1173–1175, May, 1984.     

A Multiphasic Model Describing the CO2 Injection Problem

According to the annual data, the portion of ejected carbon dioxide (CO₂) into the atmosphere is much higher in comparison to other greenhouse gases. Therefore, the development of various scenarios in order to reduce the CO₂ concentration in the atmosphere is nowadays a challenge and a relevant subject in research. The current investigation is dedicated to the modelling of a CO₂ injection into a water-saturated aquifer as the most capable reservoir, where its upward migration is blocked by a dense cap-rock layer. The major part of the study is focused on two specific processes taking place in the stored reservoir: the phase transfer phenomenon of the supercritical CO₂ which occurs under changeable surrounding conditions and the sequestration-driven deformation of the solid skeleton acting under the pressure of the pumped CO₂. For the numerical simulations within a continuum-mechanical framework, a multiphasic model based on the Theory of Porous Media is introduced. Moreover, the main principles of developing a constitutive equation for the mass production term for the mass balance equation are discussed here. (© 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)     

Synthesis of a magnetically active compound in the presence of technical-grade lignosulfonates

The conditions of the synthesis of a magnetically active compound by redox transformation of iron(II) and chromium(VI) ions were determined. Under the synthesis conditions, the chromium compounds are recovered from the solution virtually completely. The use of technical-grade lignosulfonates in the step of the condensation of the magnetically active compound leads to considerable enhancement of the magnetic activity.