Joint reduction of Fe(III), Ni(II), and Co(II) ions in solution in contact with aluminum

Joint reduction of iron group metals in aqueous solutions on a dispersed aluminum matrix was studied. The powders obtained were examined by X-ray phase analysis and electron scanning microscopy.     

Aminomethylation of some 4-thiazolidinones

2-Arylaminomethylimino-3-aryl-4-oxothiazolidines were obtained by the Mannich reaction. The structure of the isolated products was confirmed by acid hydrolysis, the formation of monoacetyl derivatives, and the IR spectra.     

Fischer cyclization of 5-substituted pyrid-2-yl-hydrazones of cyclohexanone

The effect has been studied of the nature of the substituent (methyl, chloro, nitro group) on the Fischer cyclization of 5-substituted pyrid-2-yl-hydrazones of cyclohexanone under the action of different catalysts: Lewis acids and strong mineral and arylsulfonic acids.     

Influence of the reagent pretreatment of wastewaters from chemical plants on the efficiency of their biological treatment

Russian Journal of Applied Chemistry - Structure formation in the flocculant-wastewater component system was studied by viscometry and IR spectroscopy. Statistical treatment of the experimental...     

Extraction of strontium(II), silver(I), and lead(II) with some oxathia- and thiacrown compounds

The extracting power of 12- and 18-membered oxathia- and thiacrowns in relation to strontium, silver, and lead ions from aqueous solutions in the presence of anions with various degrees of hardness was investigated with radiometric determination of the metal content. The best results for the extraction of lead were obtained with the 18-membered macrocycles.     

Analytical solution for the general mechanochemical corrosion of an ideal elastic–plastic thick-walled tube under pressure

The paper presents analytical solutions for the equal-rate mechanochemical wear of an ideal elastic–plastic thick-walled cylindrical tube subjected to any combination of internal and external pressure. The rates of corrosion at the inner and outer surfaces are supposed to be proportional to the equivalent tensile stress at the surface involved when it exceeds a given threshold. Furthermore, the corrosion rate can decay exponentially with time. The obtained solutions allow to assess the time of the initial yielding at the bore of the tube and the time of fully plastic yielding. Calculations showed that the time of plastic-zone propagation throughout the tube wall can be much greater than the length of the pure elastic stage. The proposed analytical solutions are to be used for design purposes and as benchmark solutions for numerical analysis.     

Effect of an External Heavy Atom on the Product Yield of Photoinduced Heterocyclization of 2-Azidobenzoic Acid

High Energy Chemistry -