Corrosion wear of equipment is a significant problem at any oil and gas production facility, where most of materials are metals. The effectiveness of counteracting corrosive wear largely determines the terms of safe and reliable use of equipment. The application of corrosion inhibitors still remains a key method of protecting oilfield equipment from the destructive impact of corrosion processes. Due to the growing attention to the problem of environmental pollution, the demand for environmentally benign reagents is significantly increasing. In this work, imidazoline derivatives, which are featured by low toxicity and high efficiency of inhibitory action, were developed as a safe active base of the inhibitor. A single-reactor method for the synthesis of imidazolines based on carboxylic acids and ethylenediamines, which does not require harsh conditions and solvents, was determined to be the simplest and most environmentally friendly. The optimal ratio of feedstock reagents was established, which provide the maximum protective ability of the active base. Fatty acids were isolated from renewable raw materials (vegetable oils), on the base of which a number of imidazoline derivatives were synthesized. The protective and low-temperature properties of the obtained active bases were investigated, which showed that imidazoline IM3, containing mainly ricinoleic, oleic and linoleic acid hydrocarbon fragments in its structure, demonstrates the best properties. For the selected active base, environmentally friendly solvents were selected in order to ensure optimal low-temperature and fire-safe characteristics. The required low-temperature properties were achieved with a mass content of 20% isopropyl alcohol and 30% diethylene glycol in the corrosion inhibitor composition.
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