ADSORPTION PROPERTIES OF A MULTI-FUNCTIONAL IMIDAZOLINE-BASED INHIBITOR

Аннотация

During the research, the optimal conditions for the synthesis of 2- hexadecyl-2-imidozoline C H N , 2-octadecyl-2-imidozoline C H N , and 2- 20 40 2 21 40 2 octadecyl-2-imidozoline C H N from the three-acid fraction (TAF) obtained by 21 38 2 adsorption of wood chips and extraction in isopropyl alcohol were determined. 98% ethylenediamine was used for the synthesis. TAF is a mixture of palmitic, oleic, and linoleic acids, present in a ratio of 30.3+22.7+42.3% by mass, respectively. Keywords: imidazolines, trihydric acid fraction, fatty acids, corrosion inhibitor, diamides, oil production, environmental sustainability Imidazolines and compositions based on them exhibit a high protective effect not only against carbon dioxide and hydrogen sulfide corrosion, but also in acidic environments [1, 2]. Based on this, surfactants and imidazoline compositions with the addition of a solvent were tested in 5, 10, 15 wt.% aqueous solutions of hydrochloric and sulfamic acids for 24 hours at room temperature. The concentration of inhibiting compositions ranged from 0.03 to 1.00% by mass. According to GOST R 9.905-2007 and technical regulations of oil and gas production enterprises, the maximum permissible corrosion rate of steel St.3 under these conditions should be 0.2 g/ (m2∙h) [3]. One of the important methods for the synthesis of alkylimidozolines is the reaction of ethylene diamine or polyethylene polyamines with fatty acids: or based on their reactions with esters : The process is carried out in two stages. Step 1: Formation of acidic amidoamines from fatty acids with ethylene diamine: 175 R – C O O H + H 2 N C H 2 C H 2 N H 2 N R N – H + 2 H 2 O R–COOR1+ H 2 NCH 2 CH 2 NH 2 + R1OH + H O N N –H 2 R МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ АКАДЕМИЧЕСКИХ НАУК Step 2: Amidoamino acid heterocyclization to form alkylimidozoline derivatives: Diamides are formed as secondary products of the process: Carboxylic acid diamides are poorly soluble in water and organic solvents, decompose into monoamides under reaction conditions, have low surface activity, and their presence in the finished product negatively affects its quality. The separation of diamide from the finished product is carried out by the rectification method, which requires additional costs. To achieve economic efficiency in industry, pure fatty acids are not used, but their mixtures. However, the use of a mixture of fatty acids causes technological problems in determining optimal reaction conditions, leading to a decrease in imidazoline yield and an increase in by-products. Experiments show that the proportions of the resulting alkylimidozoline and diamide are related to the electrophilicity of the carbonyl carbon of the acylation agent, i.e., the chain length of the carbonic acid radical. During the research, the optimal conditions for the synthesis of 2-hexadecyl- 2-imidozoline C H N , 2-octadecyl-2-imidozoline C H N , and 2-octadecyl-2- 20 40 2 21 40 2 imidozoline C H N from three acid fractions (TAF) adsorbed on wood chips and 21 38 2 extracted with isopropyl alcohol were determined. 98% ethylenediamine was used for the synthesis.TAF is a mixture of palmitic, oleic, and linoleic acids, containing 30.3+22.7+42.3% by mass. Three different reactions were carried out to determine the optimal conditions for the heterocyclization reaction. Methodology of the experiment: a three-gorney flask was equipped with a thermometer, a Wurtz nozzle with a Libix refrigerator, and a mechanical stirrer. Thermal treatment of the reaction mass was carried out using an electric heater. 100 g of TAF and 100 g of ethylenediamine were placed in the reactor, heated to 40°C, and a stirrer was switched on during the melting of TAF. During intensive mixing and gradual temperature increase in the cooler at 130 °C, condensation of water vapor was observed, and condensate accumulated in the collector. When the temperature was raised above 200 °C, the excess ethylenediamine was also removed, and at a temperature above 250 °C, the water of the heterocyclization reaction was removed. Heat treatment was carried out at a temperature of 270 °C for 1 hour. Then the process is carried out in a vacuum of 180 mm Hg. After 1 hour, heterocyclization was completed, and the remaining water was separated. The synthesis was completed, and the resulting product was analyzed using IR spectrum and gas-liquid chromatography methods. 176 R – C O O H + H 2 N C H 2 C H 2 N H 2 R - C O N H C H 2 C H 2 N H 2 + H 2 O R -CONHCH CH NH + H O 2 2 2 N N –H 2 R R - C O N H C H 2 C H 2 N H 2 + R - C O O H R - C O N H C H 2 C H 2 N H C O - R + H 2 O МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ АКАДЕМИЧЕСКИХ НАУК Subsequent studies were associated with a decrease in the amount of acid diamides in the finished product, as well as experiments were conducted with a change in the carboxylic acid:amine ratio and an increase in the amount of ethylenediamine. For this, 50 g of TAF, 100 g of ethylenediamine (TAF:EDA÷1:4) were added to the reaction flask and the seque