CHEMICAL TECHNOLOGY (inorganic and organic substances. Theoretical fundamentals)

SYNTHESIS OF STYRENE BUTADIENE RUBBER IN PRESENCE OF GRINDED VULCANIZATE

The method for recycling of rubber of different composition in granular state by introducing them into the polymerization medium at the synthesis of butadiene-styrene rubber was considerd. It was shown that rubber made on basis of such rubber, exhibits better physical and mechanical properties than at introducing grinded vulcanizate at producing these mixtures on rolls as well as through rubbers thermomechanical regeneration.

Key words: grinded vulcanizate, rubber synthesis, rubber swelling in the monomers, rubber mixtures and vulcanizates, physical and mechanical parameters

2016, Т. 59, № 4, Стр. 78-82

SORPTION OF AMINO ACID AND CHANGES IN HYDRATION OF HETEROGENEOUS CATION- AND ANION-EXCHANGE MEMBRANES FUMASEP

Hydration of heterogeneous cation-exchange membranes Fumasep FTCM and anion-exchange membranes Fumasep FTAM in hydrogen and hydroxyl forms, respectively, sorbing tyrosine as well as of the samples being used in electrodialysis concentration of tyrosine solution was studied using the methods of thermogravimetry and IR-spectroscopy. It was revealed that tyrosine sorption and membranes application in electrodialysis of this amino acid solution causes membranes hydration decrease. The decrease in membrane hydration after its contact with tyrosine leads to membrane surface hydrophobicity grow up and, consequently, make significant influence on amino acid’s mass transfer.

Key words: ion-exchange membrane; amino acid; tyrosine; sorption; hydration

2016, Т. 59, № 4, Стр. 73-77

CHANGING SOME PA-6 PROPERTIES AT ITS SYNTHESIS BELOW MELTING POINT

This paper presents the fractionation of PA-6 obtained at temperature below its melting point. Unfractionated samples and polymer fractions were studied by viscosimetry, thermogravimetry (TG, DTG) and differential scanning calorimetry (DTA). It was shown that at the first step of synthesis the polymer is formed with a predominantly linear structure and high parameters of thermal properties. At the second synthesis step the molecular weight of the polymer and its thermal properties increase and subsequent demonomerization-drying is accompanied by a further increase in the polyamide molecular weight.

Key words: polyamide-6 (PA-6), polymer solutions, PA-6 molecular weight determination, PA-6 preparation

2016, Т. 59, № 4, Стр. 63-67

SYNTHESIS OF Pd-CONTAINING HYPERCROSSLINKED POLYSTYRENE AND RESEARCH OF ITS CATALYTIC PROPERTIES FOR FURFURAL HYDROGENATION

In this paper the results were presented on the study of physical-chemical and catalytic properties of Pd nanoparticles synthesized in hypercrosslinked polystyrene matrix with various methods allowing to obtain Pd particles of different sizes. Obtained samples were sudied with the methods of chemisorption of hydrogen, nitrogen adsorption, X-ray photoelectron spectroscopy. Synthesized catalysts were tested in the reaction of catalytic furfural hydrogenation. The dependence of the catalysts activity on their structural characteristics was determined.

Key words: palladium, furfural, furfuryl alcohol, hypercrosslinked polystyrene, hydrogenation

2016, Т. 59, № 4, Стр. 59-62

CYCLIZATION OF MATRIX COPPER-BASED ELECTRODES IN NITRIC APROTIC SOLUTION OF CALCIUM SALT

Influence of calcium compounds in the structure of copper matrix preliminary modified with transition metals on the cyclization of CuCa, CuBiCa, CuPbBiCa electrodes in nitric aprotic solution of calcium salt was studied. The composition of forming calcium compounds in the copper structure and electrochemical copper-based alloys was found by X-ray analysis.

Key words: method of electrochemical cathode intercalation, solid solution, intermetallic compound, potential, diffusion

2016, Т. 59, № 4, Стр. 55-58

SORPTION OF RARE-EARTH METALS FROM NO EVAPORATED DIHYDRATE PHOSPHORIC ACID ON MACROPOROUS STRONGLY ACIDIC CATIONITE

The kinetic and dynamic characteristics of the sorption of rare earths metals (REE) from no evaporated extration phosphoric acid (EPA) of dihydrate production on macroporous strongly acidic cation Rurolite C150 were investigated. The process of sorption of rare earth metals was established to take place in the external diffusion region.

Key words: sorption, phosphoric acid, macroporous cation, rare earth elements

2016, Т. 59, № 4, Стр. 50-54

EVALUATION OF PRODUCTIVETY AND POWER OF SCREW FEEDER OF DISPERSE MEDIA

On the basis of performed mathematical modeling of process of movement and compaction of dispersed material in a horizontal screw the method was proposed of assessing productivity and power of the screw feeder of roller device taking into account the physical and mechanical characteristics deaerat-ed environment and the apparatus parameters.
Key words: disperse material, screw feeder, productivity, drive power, pressure backup, roll de-vice, porosity, Lame coefficients

2016, Т. 59, № 1, Стр. 85-87

REALIZABILITY FIELD AND AUTOMATIC OPTIMIZATION OF BINARY RECTIFICATION COLUMN

It was shown that the dependence of maximal productivity of binary rectification column on heat consumption taking into account the irreversibility of heat and mass transfer can be charaterized with two generalized parameters. The system of automatic supporting of column regime corresponding to its maximum productivety was proposed.
Key words: бинарная ректификация, теплоперенос, массоперенос, режим максимальной производительности

2016, Т. 59, № 1, Стр. 81-84

SYNTHESIS AND PROPERTIES OF INTERACTION PRODUCTS OF TRIS[TRI(BUTOXY)TITANATE]BORON...

SYNTHESIS AND PROPERTIES OF INTERACTION PRODUCTS
OF TRIS[TRI(BUTOXY)TITANATE]BORON AND ALIPHATIC FLUORINATED ALCOHOLS
Synthesis and properties of products based on tris[[tri(butoxy)titanate]boron with complete or partial substitution of butoxy groups linked with titanium by fluorinated alkoxy group were described. Extracted products were liquid or solid substances which are high soluble in aliphatic-, aromatic- chloraromatic- and chlorinated hydrocarbons, low alcohols, and ketone. Their structure was confirmed by elemental analysis, determination of molecular mass, IR and 1H NMR spectroscopy.
Key words: tris[[tri(butoxy)titanate]boron, interesterification, aliphatic fluorine-containing alco-hols, olygomer

2016, Т. 59, № 1, Стр. 75-80
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