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Lauric acid tetracyclic imidazoline corrosion inhibitor and preparation method thereof
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A technology of tetracyclic imidazoline laurate and corrosion inhibitor, which is applied in the field of tetracyclic imidazoline laurate corrosion inhibitor and its preparation, can solve problems such as poor corrosion inhibition effect, achieve corrosion prevention, simple process, and low raw material cost Effect
Inactive Publication Date: 2020-03-24
SOUTHWEST PETROLEUM UNIV
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[0007] The object of the present invention is to provide a kind of lauric acid tetracyclic imidazoline corrosion inhibitor and preparation method thereof, to solve the problem of poor corrosion inhibition effect of existing imidazoline corrosion inhibitors
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Embodiment 1
[0036] A lauric acid tetracyclic imidazoline corrosion inhibitor, comprising the following steps:
[0037] (1) Dissolve 0.08mol of sebacic acid in xylene, then heat up to 80°C, add 0.2mol of tetraethylenepentamine, and then heat up to 120°C for reaction for 4h;
[0038] (2) cooling the product obtained in step (1) to 80 °C, then adding 0.8 mol of lauric acid, and then heating the temperature to 160 °C for 2.5 hours;
[0039] (3) The product obtained in step (2) is heated to 220° C. and reacted for 3.5 hours to obtain a lauric acid tetracyclic imidazoline corrosion inhibitor.
Embodiment 2
[0041] A lauric acid tetracyclic imidazoline corrosion inhibitor, comprising the following steps:
[0042] (1) Dissolve 0.1mol of sebacic acid in xylene, then heat up to 100°C, add 0.18mol of tetraethylenepentamine, then heat up to 130°C to react for 3h;
[0043] (2) cooling the product obtained in step (1) to 100° C., then adding 0.12 mol of lauric acid, and heating the temperature to 150° C. for 3 hours;
[0044] (3) The product obtained in step (2) is heated to 240° C. and reacted for 3 hours to obtain a lauric acid tetracyclic imidazoline corrosion inhibitor.
Embodiment 3
[0046] A lauric acid tetracyclic imidazoline corrosion inhibitor, comprising the following steps:
[0047] (1) Dissolve 0.05mol of sebacic acid in 50ml of xylene, then heat up to 90°C, add 0.12mol of tetraethylene pentamine, then heat up to 140°C and react for 2.5h;
[0048] (2) cooling the product obtained in step (1) to 90° C., then adding 0.1 mol of lauric acid, and heating the temperature to 140° C. for 2.5 hours;
[0049] (3) The product obtained in step (2) is heated to 230° C. and reacted for 4 h to obtain a lauric acid tetracyclic imidazoline corrosion inhibitor.
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Abstract
The invention discloses a lauric acid tetracyclic imidazoline corrosion inhibitor and a preparation method thereof, and belongs to the technical field of corrosion inhibitor production. The lauric acid tetracyclic imidazoline corrosion inhibitor is prepared through the steps that sebacic acid and tetraethylenepentamine are heated to react under the condition that xylene exists, then lauric acid isadded in the reaction system, temperature rise is conducted, amidation is conducted, temperature rise is conducted again after the amidation in which the lauric acid participates is finished and cyclization reaction is conducted. The lauric acid tetracyclic imidazoline corrosion inhibitor belongs to a green corrosion inhibitor, is low in toxicity and environment-friendly and has a good corrosioninhibition effect, and at the normal temperature, the lauric acid tetracyclic imidazoline corrosion inhibitor is good in liquidity, slightly soluble in water and freely soluble in organic solvent.
Description
technical field [0001] The invention relates to the technical field of corrosion inhibitors, in particular to a tetracyclic imidazoline laurate corrosion inhibitor and a preparation method thereof. Background technique [0002] Imidazoline corrosion inhibitor is a green corrosion inhibitor commonly used in acidified environments, which has the functions of inhibiting metal corrosion and slowing down the corrosion rate. The imidazoline corrosion inhibitor belongs to the adsorption film type corrosion inhibitor, and the imidazoline molecule has polar groups and non-polar groups. The polar groups are mainly adsorbed by nitrogen and adsorbed on the metal surface. The non-polar groups are mainly hydrophobic groups with long carbon chains, which can form a hydrophobic film between the metal and the solution, which can prevent the corrosion of the metal surface. [0003] The imidazoline corrosion inhibitor is mainly synthesized and prepared from raw materials such as fatty acids ...
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