RU2756210C1 - Method for obtaining corrosion inhibitor based on polypropylene polyamine and carboxylic acid for oilfield, mineralized and hydrogen sulfide-containing media - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of protection of gas and oilfield equipment and pipelines operating in highly mineralized hydrogen sulfide-containing aqueous media from corrosion, as well as to the field of oil and gas transportation. The method involves the interaction of polypropylene polyamine and carboxylic acid with the distillation of reaction water and impurities, while tetrapropylene pentamine [(3,6,9,12-tetramethyl)-1,4,7,10,13-pentamine-tridecane] is used as polypropylene polyamine, which interacts with monocarboxylic acid, which is used as oleic acid, first at a temperature of 160°C for 5.5 hours, then, at a temperature of 260°C for 2.5 hours in the molar ratio of tetrapropylene pentamine and oleic acid equal to 1:2.1, followed by the interaction of the resulting bis-imidazoline with ethylene oxide at a temperature of 45°C in the molar ratio of bis-imidazoline based on tetrapropylene pentamine and ethylene oxide equal to 1:1.05.

EFFECT: expansion of the raw material base and the range of products.

1 cl, 1 tbl, 1 ex

Description

The invention relates to the field of protection of gas and oil field equipment and pipelines operating in highly mineralized hydrogen sulfide-containing aqueous media from corrosion, as well as to the field of oil and gas transportation.

A known method of producing a corrosion inhibitor obtained by amination of benzenesulfochloride with an aqueous solution of ammonia (US Pat. 2096523 RF, 1997).

The disadvantage of the known corrosion inhibitor is the low degree of protection of the metal, its poor solubility in the above media, the multistage nature of its synthesis.

It is known to use a wide range of complex compositions to prevent corrosive destruction of oilfield equipment - petrochem-3, SNPKh-6301, SNPKh-6302, SNPKh-6011, SNPKh-6014, Vikor, as well as a mixture of aminoparaffins obtained by amination of the chlorination product with chlorine of liquid C paraffins _10-26 with boiling range 220 - 345 ° C (US Pat. RF No. 2074170; Bull. No. 6, 1997).

The disadvantage of using these corrosion inhibitors is the low degree of metal protection against corrosion, poor solubility of the inhibitor in the above media.

The objective of the invention is to develop a method for producing corrosion inhibitors that provide effective protection of metals of gas and oil field equipment, pipelines from corrosion.

The technical result when using the invention is expressed in the expansion of the raw material base and the range of products, also the result of the invention is the reduction in the price of the target product,

The problem is solved by the claimed method of producing corrosion inhibitors for the protection of gas and oil field equipment and pipelines based on polypropylene polyamines and carboxylic acids with distillation of reaction water and impurities. Tetrapropylenepentamine (TPPA) [(3,6,9,12-tetramethyl) -1,4,7,10,13-pentamino-tridecane] is used as polypropylene polyamines, which reacts with monocarboxylic acids, which are oleic acid (ol k.), first at a temperature of 160 ° C for 5.5 h, then at a temperature of 260 ° C for 2.5 h in a molar ratio of TPPA and monocarboxylic acids equal to 1: 2.1, followed by the reaction of the obtained bis-imidazolines with ethylene oxide at a temperature of 45 ° C in a molar ratio of bis-imidazoline based on TPPA: ethylene oxide equal to 1: 1.05.

The above result of obtaining corrosion inhibitors operating in mineralized and hydrogen sulfide-containing environments is achieved by the feature that TPPA interacts with oleic acid (ol.k.) first at a temperature of 160 ° C for 5.5 hours, then at a temperature of 260 ° C for 2.5 h in a molar ratio of TPPA: ol.k. = 1: 2.1 with the formation of bis-imidazoline (1).

R = C ₁₇ H ₃₃ .

The obtained bis-imidazoline (1) is reacted with ethylene oxide (OE) at a temperature of 45 ° C in a molar ratio of bis-imidazoline (1): OE = 1: 1.05.

The essence of the invention is illustrated by the following examples.

Example 1. In a reactor with a stirring device, a thermometer, a refrigerator and a dropping funnel, 24.5 g (0.1 mol) of tetrapropylene pentamine (TPPA) and 59.22 g (0.21 mol) of oleic acid (Ol.c.) are charged in molar ratio TPPA: Ol.k. = 1: 2.1. The reaction mixture is heated first at a temperature of 160 ° C for 5.5 h, then at a temperature of 260 ° C for 2.5 h, and the reaction water and impurities contained in the starting products are continuously distilled off.

72.37 g (98.2%) of bis-imidazoline (2) are obtained.

Found,%: N 9.08. C ₄₈ H ₉₁ N ₅ . Calculated,%: N 9.49.

The resulting compound (2) interacts with ethylene oxide (OE) at a temperature of 45 ° C for 2 hours in a molar ratio of compound (2): OE = 1: 1.05.

76.06 g (97.4%) of N-hydroxyethyl bis-imidazoline (3) are obtained. Found,%: N 8.47. C ₅₀ H ₉₅ N ₅₀ . Calculated,%: N 8.96.

Example 1 confirms the high yield of bis-imidazolines - 97.4-98.2%, as well as a high index of the protective effect - 97.1-98.2%, provided that the declared parameters of the production process are maintained.

Subject to the deviation of the declared parameters of the process of obtaining bis-imidazolines and their derivatives, the initial heating of the reaction mixture of tetrapropylene pentamine and oleic acid at a temperature of 130 ° C for 2 hours, and subsequent heating at a temperature of 270 ° C for 1.5 hours demonstrates a decrease in the yield of the product , as well as a decrease in the protective effect.

Claims (1)

A method of producing a corrosion inhibitor based on polypropylene polyamine and carboxylic acid for oilfield, mineralized and hydrogen sulfide-containing media, including the interaction of polypropylene polyamine and carboxylic acid with distillation of reaction water and impurities, characterized in that tetrapropylene pentamine is used as polypropylene polyamine [(3,6,9,12- tetramethyl) -1,4,7,10,13 -pentamino-tridecane], which reacts with monocarboxylic acid, which is oleic acid, first at 160 ° C for 5.5 hours, then at 260 ° C for 2.5 h in a molar ratio of tetrapropylenepentamine and oleic acid equal to 1: 2.1, followed by the reaction of the obtained bis-imidazoline with ethylene oxide at a temperature of 45 ° C in a molar ratio of bis-imidazoline based on tetrapropylenepentamine and ethylene oxide equal to 1: 1 , 05.