Problems of Chemistry and Chemical Technology

Neutral and Basic Dialkildithiophosphate Structure Investigation

Neutral and basic zinc diisobutyldithiophophate (ZDDP) were synthesized and their structure was investigated. Diisobutyldithiophosphoric acid, neutral and basic ZDDP chemical composition was confirmed by elemental analysis. Obtained neutral and basic ZDDP differed by physical-chemical properties. IR-spectra comparison of neutral and basic ZDDP shows absence of absorption band which corresponds to hydroxyl group. XRD investigation neutral and basic ZDDP results in definite formulas and structures.

Substantiation of Processes Efficiency Methodology Assessment of Plant Material Delignification

The paper analyzes the consumption and production of paper and cardboard during the years of Ukrainian independence. We summarize the experimental data for obtaining laboratory samples of cardboard and paper products with using its fiber composition of pulp from non-wood plant materials. It is shown that to increase the consumption of paper and paperboard per capita to expand the capacity of enterprises to obtain pulp from various sources of plant material, particularly from non-wood plant materials.

Mathematical Model of Pervaporation Separation of Binary Solutions

The paper develops the mathematical model of pervaporation of the organic component through a non-porous polymer membrane in the round crossing. We also present a system of equations describing the process of pervaporation separation of binary solutions.

The Effect of Magnetostatic Fields of Ferromagnetic Substrate on the Nickel Dendrites Electrodeposition

The paper studies the effect of magnetic state of ferromagnetic substrate on the surface morphology of nickel electrodeposit obtained by the method of electrolysis. After conducting the statistical analysis, we can assume that the residual magnetization of substrate-wire significantly influences dimensioning characteristics of the formed dendrite structures at the absence of an external magnetic field at the Ni electrodeposition. The studied magnetic properties of substrate-wire are confirmed by Bitter powder figures.

The Interaction of Calcium Phosphate with Oxalate Acid

This paper deals with the experimental research into the effectiveness of utilizing oxalic acid for decomposition of the phosphate component of phosphorites employing the trisubstituted calcium phosphate as a sample. Furthermore, the impact of such parameters as duration, temperature, the stoichiometric ratio of initial reagents is defined in the process of calcium phosphate dissolution. We determine that the calcium phosphate dissolution by the oxalate acid finishes in 30–45 minutes and the temperature at which the maximum expansion of calcium phosphate is 80 C.

X-ray Diffractometry Investigations of Ion Exchangeable Modification of Montmorillonite by Cr (ІІІ) Compounds

The paper studies structural changes of Cherkasky montmorillonite as a result of its modification by Cr (III) compounds. By employing X-ray diffractometric method, we establish the expansion of mineral crystal lattice along c-axis and the formation of interlayer aqueous- and hydroxochrome complexes of octahedron structure. It allows obtaining mineral hydroxochrome filler of disordered structure with the enhanced specific gravity surface and adsorptivity

Stability of gallium (iii) monothiocyanate complex in water and water–acetone solutions

By employing the Benesi-Hildebrand spectrophotometric method with Cu (II) and Fe (III) as indicator ions in water and water-acetone media, we determine the stability of Ga (III) monothiocyanate complex. Crucially, we establish the interrelation between the complex stability and solvent properties (dielectric permittivity and non-water component concentration).

The effect of caesium compounds on the properties of the low-temperature catalyst of carbon monoxide converstion. Caesium nitrate promotion

This paper describes the effect of promoting Cs admixtures on the catalyst activity, selectivity, stability, crystal structure and morphology of Cu-Zn-Alcatalyst of low-temperature CO conversion. We also test two methods to introduce the promoter:into calcinated, as well as into the carbonate catalyst mass. We determine that the introduction of Cs in the amount of 1% and 3 % allows reducing the catalyst activity in a side reaction of methanol formation by 3 and 6 times.

Calculation of diamond heat capacity by its spectroscopic and elastic characteristics

We calculate the heat capacity of diamond based on the inelastic neutron scattering data and elastic characteristics of the crystal at the temperature range of the diamond phase existence. We analyze the diamond phonon spectrum and reasons for heat capacity anomaly at low temperatures (under 100 K). We show that due to thermal expansion at temperatures under 300 K, the input into heat capacity has values not exceeding the measurement error in current adiabatic methods

The synthesys of nanosized potassium metatantalate in molten nitrate environment

In this paper, we describe the synthesis of nanosize potassium metatantalate, using a method of metallic tantalum powder oxidation in molten potassium nitrate. In addition, we examine the nanopowder, employing the methods of XRD, conductometry, and transparent electronic microscopy. In the course of the experimental study, it turns out that the quantity of potassium hydroxide (KOH/Ta = 1,2) must be used relatively to the stoichiometry of reaction to minimize the admixtures of polytanthalates.