International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
COMPARATIVE INHIBITORY CAPACITY OF CO2 – CORROSION INHIBITORS ON THE BASE OF SUNFLOWER AND COTTONSEED OILS MAMMADKHANOVA S.A. Doctor of Chemical Sciences Azerbaijan State Oil and Industry University,Baku
--------------------------------------------------------------------------------------------------------------------------------One of the effective methods of oil recovery increasing of layers is carbon dioxide pumping into layer. Carbonic acid, creating by dissolving of СО2 in water, dissolves some types of cement and stratum rocks and increases their permeability. In СО2 presence the swelling ability of clay particles decreases. Carbon dioxide dissolves in oil 4-10 times better than in water, therefore, it can pass from an aqueous solution to oil. During transition the interfacial tension between them considerably reduces and displacement is increasing. Furthermore, carbon dioxide in water contributes the wash of film oil covering grains and rocks and decreases the probability of water film breaking. Hereupon, oil drops in low interfacial tension passes in pore channel freely and oil relative permeability is increasing. During СО2 dissolving in oil the oil viscosity is reducing, density is increasing, but the volume is extending considerably: oil is swelling (sui generis). Increasing of oil volume 1.5-1.7 times by dissolving СО2 in it makes a major contribution to rise of layer oil recovery during development of deposits which contain low-viscosity oils. Though, along with listed advantages, the use of carbon dioxide promotes the intensification of corrosion process of metallic surface, so it is required to use appropriate corrosion inhibitors. In this case, using of surfactants, which has low toxicity, high molecular weight and hydrophobicity, are reasonable. Use of common surface-active substances (SAS), contain one hydrophilic group in hydrophobic chain, as corrosion inhibitors was studied sufficiently. It was revealed that mechanism of action of amphiphilic compounds consists in formation of protective layer on metal surface [1-3]. Examples of SAS using are salts of fatty acids used for steel protection in neutral medium [4-7]. The shortcomings of these SAS are low solubility and formation of insoluble soaps in hard water. There are information in literature about using as inhibitors the steel of various modifications of fatty acids permitting to avoid above-listed shortcomings [8,9]. In presented work it was researched comparative inhibitory capacity of Na-salts (I) and monoethanolamine complexes (II) of sulfoderivatives of fatty acids of cottonseed and sunflower-seed oils. For obtaining of above-listed sulfoderivatives, vegetable oils were saponified with the following sulphurization of obtained fatty acids. Physicochemical properties of fatty acids of cottonseed and sunflower-seed vegetable oils and their sulfacids, also Na-salts and monoethanolamine complexes of sulfoderivatives of fatty acids of cottonseed and sunflower oils are presented on Tables 1 and 2.
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