Chemistry Journal of Moldova

Industrial chemistry

RADIATION CHEMICAL CONVERSION OF OIL DERIVED FROM OIL-BITUMEN ROCK

Author(s):

Lala Jabbarova, Islam Mustafaev, Rauf Rzayev, Zarqalam Nabizade, Navoi Ibadov, Saida Akhmedbekova


Field: Industrial chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 80-84
Keywords: oil–bitumen rock, synthetic oil, oxygen, hydrocarbon gases, radiation
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).09

Graphical Abstract:
 The results of research in the radiation processing of synthetic oil derived from oil–bitumen rock of the Balakhany deposit in Azerbaijan are presented. The study has been conducted on a 60Co gamma-source at a dose rate of P = 0.5 Gy/s and various absorbed doses of D = 43–216 kGy. Samples of synthetic oil from natural bitumen rocks have been analyzed by chromatography, gas chromatography–mass spectrometry, and IR-spectroscopy, and their radiation resistance has been evaluated. The results of the study allow for both assessment of the feasibility of manufacturing petrochemicals for various applications by radiation processing and use of these materials for isolating radioactive sources to preclude their impact on the environment.

Downloads: 28

THE DIMINISHING OF THE CONTENT OF TEXTILE DIRECT DYES AND AUXILIARY COMPOUNDS DURING THEIR CATALYTIC OXIDATION

Author(s):

Maria Gonta, Gheorghe Duca, Vera Matveevici, Larisa Mocanu


Field: Industrial chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 85-92
Keywords: disperses dye, anionic surfactant, textile wastewater, chemical and electrochemical oxidation, adsorption, TiO2, ZrO2
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).10

Graphical Abstract: 
Advanced oxidation methods of organic compounds lead to their partial mineralization and increase of the adsorption process efficiency on the surface of oxidized activated carbon. We have studied the oxidation process using model solutions containing mixture of dye direct brown (DB), ethylene glycol (EGL) and sodium lauryl sulfate (SLS) under the action of Fenton reagent, in the presence and absence of UV irradiation or under the action of electric current (in the electrochemical cell). The same studies were performed by replacing the iron (II) ion with titanium dioxide.

Downloads: 35

SYNTHESIS OF ACRYLIC ESTERS IN PTC: KINETICS AND ECOLOGICAL ASPECTS

Author(s):

G. Torosyan, G. Aidan, N. Torosyan


Field: Industrial chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 43-46
Keywords: Phase transfer catalysis (PTC), acrylic acid, alkyl halogenide, acrylic ester, kinetic characteristic.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2013.08(1).06

Graphical Abstract:
The synthesis of esters of acrylic acids, which are applied for synthesis of polymeric materials by phase transfer catalysis were discussed (PTC), which is very useful for reduction of reaction consumption of materials and power.This method has substantial advantages including high speed of the process, soft condition of reaction and reduced pollution.

Downloads: 60

AUTOCATALYTIC REDUCTION AND CHARACTERISTICS OF BORON-CONTAINING COATINGS

Author(s):

V. Covaliov, O. Covaliova, M. Ivanov, A. Drovosekov


Field: Industrial chemistry
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 47-57
Keywords: autocatalysis, coatings, alloys, hydrogen generation, electrolytic cell.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).07

Graphical Abstract:
The research results of the plating conditions, chemical composition and properties of Ni-B coatings and Ni-Re-B, Ni-Mo-B and Ni-W-B alloys are given. It was shown that introduction of alloying elements (Re, Мо and W) in the composition of Ni-containing coatings modifies the catalytic activity of the alloys’ surface, with regard to the parallel reactions of dimethylamino-borane (DMAB) heterogeneous hydrolysis, Ni reduction and evolving of the molecular hydrogen. It was found that with the increase in concentration of alloying element, boron content in the coatings is decreased to the trace amounts. The effect of alloys composition on hydrogen evolving overvoltage was studied. Due to the low overvoltage of hydrogen evolving (HE) on the alloy Ni-Re-B surface (11 at.% Re), it can be used as electrode for hydrogen generation from water in the electrolytic cell with novel design and improved technical-economic indicators.

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INVESTIGATION OF THE PROCESS OF TARTARIC ACID SEPARATION ON AMBERLITE XAD2 IMPREGNATED WITH AMBERLITE LA-2

Author(s):

N. Marchitan


Field: Industrial chemistry
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 116-123
Keywords: reactive sorption, tartaric acid, Freudlich equation, Langmuir equation, thermodynamic constants.
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DOI:
dx.doi.org/10.19261/cjm.2012.07(2).06

Graphical Abstract:
 This work describes an investigation of the process of reactive ion-exchange separation of tartaric acid from model systems with macroreticular resin AmberliteXAD2 impregnated with liquid ion-exchanger Amberlite LA-2 in batch equipment.The condition of Amberlite XAD2 impregnation process was investigated. Freudlichand Langmuir equations were verified and values of enthalpy, entropy and Gibbs energy were calculated. This article is an extended abstract of a communicationpresented at the Conference Ecological Chemistry 2012.

Downloads: 14

CYCLODEXTRINS - FIELDS OF APPLICATION. PART II

Author(s):

Gh. Duca, A. Ivancic, V. Boldescu


Field: Industrial chemistry
Type: Review
Issue: 2012 Volume 7, no.2
Pages: 39-45
Keywords: cyclodextrins, pharmaceuticals, medicine, inclusion complexes.
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Downloads: 21

COBALT SALTS PRODUCTION BY USING SOLVENT EXTRACTION

Author(s):

Liudmila V. Dyakova, Aleksander G. Kasikov, Elena S. Kshumaneva, Svetlana V. Drogobuzhskaya


Field: Industrial chemistry
Type: Research paper
Issue: 2010 Volume 5, no.1
Pages: 90-94
Keywords: cobalt, solvent extraction, tertiary amines, salting-out, octanoic acid.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2010.05(1).08

Graphical Abstract: 
The paper deals with the extracting cobalt salts by using mixtures on the basis of tertiary amine from multicomponent solutions from the process of hydrochloride leaching of cobalt concentrate. The optimal composition for the extraction mixture, the relationship between the cobalt distribution coefficients and modifier’s nature and concentration, and the saltingout agent type have been determined. A hydrochloride extraction technology of cobalt concentrate yielding a purified concentrated cobalt solution for the production of pure cobalt salts has been developed and introduced at Severonikel combine.

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THE EFFECT OF SULPHURIC ACID CONCENTRATION ON SOLVENT EXTRACTION OF ReO4 - BY THE LONG-CHAIN ALIPHATIC TERTIARY AMINES AND ALCOHOLS

Author(s):

Aleksander G. Kasikov, Anna M. Petrova


Field: Industrial chemistry
Type: Research paper
Issue: 2010 Volume 5, no.1
Pages: 95-97
Keywords: Rhenium, solvent extraction, long-chain aliphatic tertiary amine and alcohols, sulphuric acid media.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2010.05(1).09

Graphical Abstract:
 The effect of sulphuric acid concentration on solvent extraction of ReO4- by the long-chain aliphatic tertiary amines and alcohols in a wide range of H2SO4 concentrations in initial solutions is discussed. It has been established that the influence of the sulphuric acid concentration on rhenium solvent extraction is largely due to the extraction process mechanism. In the case of the anion-exchange mechanism, ReO4- is best extracted from weakly acidic solutions, whereas when the hydrate-solvate mechanism takes place – from solutions containing 4-7 mole/l H2SO4.

Downloads: 12

CYCLODEXTRINS – FIELDS OF APPLICATION. PART I

Author(s):

Gheorghe Duca, Veaceslav Boldescu


Field: Industrial chemistry
Type: Review
Issue: 2008 Volume 3, no.2
Pages: 30-37
Keywords: cyclodextrins, food, cosmetic industry, environmental protection, agriculture.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(2).12

Graphical Abstract:
 This review is dedicated to different fields of use of cyclodextrins, a family of three cyclic natural oligosaccharides and their derivatives. The first part of the review gives a brief description of the main and the most recent developed applications of cyclodextrins in food, cosmetic industry, environmental protection technologies and agriculture. Different products based on inclusion complexes with cyclodextrins and technologies with different use of cyclodextrins and inclusion complexes are described.

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SPECTROPHOTOMETRIC STUDIES OF SANGUINARINE-Β-CYCLODEXTRIN COMPLEX FORMATION

Author(s):

Veaceslav Boldescu,Irina Kacso, Ioan Bratub and Gheorghe Duca


Field: Industrial chemistry
Type: Research paper
Issue: 2008 Volume 3, no.1
Pages: 85-88
Keywords: sanguinarine, β-cyclodextrin, inclusion complex, UV-vis spectrophotometry, association constant.
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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2008.03(1).18

Graphical Abstract:
The main aim of this study was to investigate the influence of pH and the presence of hydrophilic polymer polyvinylpyrrolidone on the formation of sanguinarine-β-cyclodextrin (SANG
-β-CD) inclusion complex. Spectrophotometric studies of the SANG-β-CD systems in the presence and without 0.1 % PVP at the pH 5.0 did not show any evidence of the complex formation. However, the same systems showed several obvious evidences at the pH 8.0: the hyperchromic and the hypochromic effects and the presence of the isosbestic point in the region of 200 –210 nm. The association constants calculated by three linear methods: Benesi-Hildebrand, Scott and Scatchard, were two times higher for the systems with addition of 0.1% PVP than for the systems without it.

Downloads: 14