ACTIVATION OF THE TRANSESTERIFICATIONS PROCESS OF VEGETABLE OILS TRIGLYCERIDES WITH METHANOL UNDER THE INFLUENCE OF MAGNETIC FIELD

The process of producing mono-alkyl esters of fatty acids from cottonseed and sunflower oils under the influence of the magnetic field with intensity  15-45 mT  was  investigated . It was revealed that the use of the energy of  magnetic field allows to reduce the reaction time to 10 times, the excess of used alcohol to 2 times while maintaining high yield of the desired product

Synthesis of ethylolammonium salts of diethylolamido phosphate surfactant based on the flaxseed oil and their corrosion inhibitor properties

Carbon steel as a relatively cheap material having very high mechanical characteristics is widely used in practically all fields. Regrettably, this alloy undergoes corrosion in practice under the action of such aggressive components as hydrochloric and hydrosulphuric acids, carbon dioxide and many others [1]. Hydrochloric acid is very effective for dissolving calcium carbonate scale inside the pipelines and finds a large application with this goal. There are several ways for decreasing the rate of metals corrosion. One of them is an introduction of inhibitors into acidic systems. The most preferable inhibitors for protection of metals against corrosion are of organic nature and contain such heteroatoms as nitrogen, oxygen, phosphorus and sulphur as well as aromatic rings and multiple bonds. Among various groups of inhibitors surface-active inhibitors are characterized by high levels of inhibition efficiency, cheapness, relative harmlessness and easiness of production. Inhibition was reported to be realized as a result of adsorption of the surfactant molecules, with an aid of their functional groups, to the metal surface [2–5].Presence of such heteroatoms as nitrogen, sulfur and oxygen, because of their tendency to be adsorbed at the metal/media interface with formation of protective layer, is very important [6-8]. Inhibition of iron corrosion by surfactants may occur via two phenomena consisting in blocking and hydrophobing effects [9].As is known, inhibitors are considered to be optimal if they are based on relatively cheap and non-toxic initial components and contain the above-shown heteroatoms and fragments. From this standpoint vegetable oils are very convenient raw materials as they are restorable and ecologically clean [10-13]. In the present study weight loss measurements were performed to examine the H2S acid corrosion inhibition process of carbon steel by some surfactants synthesized on the basis of flaxseed oil and such ethanolamines as monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA) for the range of concentrations below the critical micelle concentration. Similar surfactants were synthesized and studied as chemicals for removing thin petroleum films from water surface [14]. Meanwhile, the values of interfacial tension at the water-kerosene border in the presence of the synthesized surfactants have been determined and respective colloidal-chemical parameters have been computed

Conservative liquids based on synthetic petroleum acids salts and aliphatic nitro-compounds

Synthetic oil acids (SOA) salts and nitroderivatives of high olefins C14 as oil-soluble corrosion inhibitors for mild steel in various mediums was synthesized. On the bases of turbine oil T-30 was prepared composition of conservative liquid and investigated their properties. The best result for the conservation liquids were obtained with Co-salt of SOA and nitroderivatives of α-olefins of C14. Protection period in sea water was 103 days, in hydrocamber was 206 days

Conservation liquids on the bases of turbine oil of grade T-30 and corrosion inhibitor

Conservation liquids have been prepared by adding to T-30 turbine oil different amounts of amidoamine compounds synthesized in 2:1 molar ratio of technical petroleum acids (TPA) to polyethylenepolyamine (PEPA), nitro-compound and phenol-p-alkyl(C8-C12)phenolformaldehyde olygomers on the basis of C14H28 containing α-olefin, as well as composition on the bases of them. Defined that the use of these compounds as compositions records high result as corrosion inhibitor in protection of metal constructions.Â

INVESTIGATION IMIDAZOLINE DERIVATIVES OBTAINED FROM SYNTHETIC PETROLEUM ACIDS AS CORROSION INHIBITOR

Imidazoline derivatives have been synthesized based on the synthetic petroleum acids (SPA) and diethylentriamine. Complexes were prepared from these compounds and HCl in ratio 1:1, 1:2, 1:3. 20% solution of the complexes were prepared in aqueous isopropyl alcohol. The kinetic effect of steel corrosion in 1% NaCl solution saturated with CO2 were studied ACM Gill AC potentiometer. It was found that, the imidazoline derivatives complexes based on the SPA and DETA with HCl in molar ratio 1:1 of 25 ppm concentration protection from corrosion is 83,5%, 100 ppm  concentration – 97,1%; the proportion of 1:2 complex of  25 ppm – 82,8%, 100 ppm  concentration – 97,3%, but in the case of the 1:3 complex shows the best result - 94 and 98,8%

Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion

In the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation

Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion

In the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation

Use of Natural Nanotubes of Halloysite Clay for Thermochemical Conversion of Cottonseed Oil

The process of obtaining low molecular weight C2-C4 olefins, as a result of thermal and thermocatalytic conversion of cottonseed oil was investigated. The total content of olefin gases obtained by the thermal conversion of cottonseed oil in the temperature range of 700-800°C is 57.2-65.2 wt. %. Thermocatalytic conversion of cottonseed oil on the natural halloysite nanotubes as a catalyst in the temperature range of 500-800 ° provides the total content of olefins 10.8-69.2 wt. with increased yield of propylene and butenes

Novel naphthenate surfactants based on petroleum acids and nitrogenous bases as corrosion inhibitors for C1018-type mild steel in CO2-saturated brine

The efficiency of two natural naphthenate surfactants (Naphthenic-dimethylamine and Naphthenic-diethylamine complexes), as corrosion inhibitors for mild steel in CO2-saturated 1% NaCl solution, has been determined by linear polarization resistance corrosion rate and potentiodynamic polarization measurements. These compounds inhibit corrosion even at very low concentrations (25 ppm), and Naphthenic-diethylamine complex is the best inhibitor giving maximum inhibition efficiency (99.76) at 100 ppm. Polarization curves indicate that, the two investigated compounds are mixed inhibitors, affecting both cathodic and anodic corrosion currents. Adsorption of naphthenate surfactants on the mild steel surface is in good agreement with the Langmuir adsorption isotherm model, and the calculated Gibbs free energy values confirm the chemical nature of the adsorption. Energy dispersive X-ray fluorescence microscopy (EDRF) and scanning electron microscope (SEM) observations confirmed the existence of such an adsorbed film on the mild steel surface