Evaluation of Corrosion Inhibitors Synthesized from Fatty Acids and Fatty Alcohols Isolated from Sugar Cane Wax

ABSTRACTThe 1-(2-aminoethyl)-2-alkyl-imidazoline (1a) and 1-(2-hydroxyethyl)-2-alkyl-2-imidazoline (1b) are well-known corrosion inhibitors widely used in the oil field.1-4 The standard procedure to synthesize them is by condensing diethylentriamine (2a) and aminoethylethanolamine (2b) with tall-oil...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2004-05, Vol.60 (5), p.465-470
Main Authors: Martínez-Palou, R., Rivera, J., Zepeda, L.G., Rodríguez, A.N., Hernández, M.A., Marín-Cruz, J., Estrada, A.
Format: Article
Language:English
Subjects:
Alcohols
Applied sciences
Brines
Carbon steels
Corrosion
Corrosion effects
Corrosion inhibitors
Corrosion mechanisms
Corrosion prevention
Corrosion rate
Esters
Exact sciences and technology
Fatty acids
Hydrochloric acid
Hydrogen sulfide
Hydrogen sulphide
Imidazoline
Inhibitors
Metals. Metallurgy
Oils & fats
Phosphate esters
Phosphates
Saccharides
Saline water
Sugarcane
Sulphides
Waxes
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Summary:ABSTRACTThe 1-(2-aminoethyl)-2-alkyl-imidazoline (1a) and 1-(2-hydroxyethyl)-2-alkyl-2-imidazoline (1b) are well-known corrosion inhibitors widely used in the oil field.1-4 The standard procedure to synthesize them is by condensing diethylentriamine (2a) and aminoethylethanolamine (2b) with tall-oil (T-O, 3a) (Figure 1),5-6 respectively, which is composed mainly of oleic and linoleic acids.7-8 Both theoretical and experimental studies on 2-alkyl-2-imidazolines showed that the inhibition efficiency (IE) and the energy binding between the inhibitor and the metal are increased along the C8-C18 series.9-11 In the same sense, the efficiency of the inhibition is also dependent of the presence of double bonds placed at the alkyl chain.12-14 On the other hand, an efficient methodology for the extraction and purification of WFAc (3b) and WFAl (4) from crude sugar cane (Saccharum officinarum, L.) wax recently has been described,15 with 1-octacosanoic acid and n-octacosanol (saturated C28) being the major compounds. The qualitative composition and biological activity of these mixtures are well known.16-19 Taking advantage of those results, this work presents the synthesis of imidazolines 1c and 1d by condensing the mixture of WFAc (3b) with 2a and 2b, respectively, while the mixture of WFAl (4) was treated with phosphorous pentoxide (5) to afford a mixture of mono- and dialkylphosphate esters (WPE, 6). To know the effect of the alkyl chain size on corrosion inhibition efficiency,
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3299242