SU1759839A1 - 2-(4-pyridyl)-3-ethylquinoline as steel corrosion inhibitor in water-oil media - Google Patents

Description

one

(21) 4891295/04

(22) 12.11.90

(46) 07.09.92. B yul ISfc 33

(71) Institute of Chemistry, Bashkir Scientific Center, Ural Branch, USSR Academy of Sciences, Scientific and Production Association Soyuznefteotdacha

(72) U.M.Dzhemilev, F.A. Selimoe, R.N. Fakhretdinov, R. A. Khusnitdinov and S. T. Pashin (56) 1. Altsiteeva A., Levin S. Inhibitors of corrosion of metals. Publishing House Himi, 1968, p. 19-27.

2. Ivanov E.S. Inhibitors of corrosion of metals in acidic environments. M .: Metallurgi, 1986. p. 158..

3, TU 38-103201-76 Omsk plant of synthetic rubber. (54) 2- (4-PYRIDYL) -3-ETHYL-QUINOLINE AS A STEEL CORROSION INHIBITOR IN WATER AND OIL ENVIRONMENTS (57) Use: as a steel corrosion inhibitor in water-oil media. Essence: product - 2- (4-pyridyl) -3-ethylquinoline, CF CieHuN. m.p. 99-102 ° C. Reagent 1: aniline. Reagent 2: aldehyde oil. Reagent 3: 4-pyridinaldehyde. Conditions: in the presence of a catalyst containing RuCta, RRNz and DMF, at 200 ° C. 1 tab.

J

This invention relates to a novel chemical compound, namely, 2- (4-pyridyl) -3-ethylquinoline of the formula

as a steel corrosion inhibitor in water-in-oil media. 2- {4-Pyridyl) -3-ethyl-quinoline and its properties are not described in the literature.

Many derivatives of quinolines and pyridines are known as corrosion inhibitors: 4,4-dipyridyl, 2- and 4-picolines and their derivatives, pyridine and its derivatives, diquinoline and its derivatives, quinoline and its derivatives 1.

A known inhibitor of HOD is a mixture of quaternary salts of pyridine and quinoline 2.

However, these inhibitors do not have a high efficacy of protection in water-in-oil environments.

The closest analogue in the structure and effectiveness of protection is the North-1 inhibitor, which is a complex mixture of polyalkylpyridines 3 and is used in acid treatments of wells and in the processing of downhole equipment. The disadvantage of this inhibitor is its low efficiency in water-oil media.

The purpose of the invention is to obtain new, more effective inhibitors of steel corrosion in water-oil environments in the row of quinolines. The goal is achieved by the synthesis of 2- (4-pyridyl) -3-ethylquinoline, formula I as above, as a steel corrosion inhibitor in water-oil media.

2- (4-Pyridyl) -3-ethylquinoline is obtained by co-condensation of aniline with butyric aldehyde and 4-pyridynaldehyde in the presence of VI

the next

00

WITH

Che

of catalyst containing RuCIa, PPH3, and DMF at a temperature of 200 ° C.

Example 1. Co-condensation of aniline with butyraldehyde and 4-pyridinaldehyde. A solution of 0.4 mmol of RuCIs (0.1 g) and 1.2 mmol of RRIES (0.3 g) in 1 ml of DMF was added to a steel autoclave (V 17 cm3) where 20 mmol of aniline (1.9 ml) were preloaded , 20 mmol of oil aldehyde (1.8 ml) and 20 mmol of pyridine-4-aldehyde (2.2 ml). The autoclave was heated for 6 hours at 200 ° C and constantly stirred, then cooled. The reaction mass was extracted three times with benzene (4 x 50 ml), the combined extracts were dried over anhydrous MgSO4, the solvent was distilled off, and the residue was fractionated in vacuo.

The resulting product is yellow crystals, m.p. 99- 102 ° C.

Found,%: C 81.9; H 6.1; N 12.0;

CieHuN

Calculated,%: C 82.1; H 5.9; N 12.0; M + 234.

PMR spectrum, d, ppm: 1.17 t (3N, CH3), 2.67 k (2H, CH2), 7.34–8.65 m (8H).

NMR spectra 13, 5, ppm: 14.69 (q, CH3), 25.62 (t. CH2), 123.53 (d). 126.9 (d) 126.96 (d), 127.82 (s), 129.12 (d), 135.28 (d), 134.45 (s), 146.2 (s), 148.36 (s). 149.75 (d), 157.47 (s).

Testing of the protective effect of 2- {4-pyridyl) -3-ethylquinoline as a steel corrosion inhibitor in water-oil media was performed under laboratory conditions by the gravimetric method.

Fat-free and dry-to-constant samples of steel 3 GOST 380–175, size 25 × 20 × 1, were placed in the working medium for 6 hours at 20 ° C with and without 2- (4-pyridyl) -3-ethylquinoline added. The reagents were metered into the water – oil mixture, and the corrosion rate was determined in the water phase of the water – oil mixture. After the residence time, the samples were subjected to appropriate processing, weighed to within 0.0002 g.

The corrosion rate (p), the degree of protection (z) was determined in accordance with formulas (1) and (2)

R - GT-. 0)

where D m - the change in mass, g:

S is the sample area, m t is the time of testing.

Z -ЈL-100

(2)

where / E1 is the corrosion rate in an environment without and ... beater, g / m2-h;

pi is the corrosion rate in the inhibited medium, g / m2 h.

Example 2. The corrosion rate of hundred / and, in the aqueous phase of the water-oil mixture (mineralized water model, oil grade 70:30, H2S content is 100 mg / l) is 0.40 g / m2 h. With the addition of 200 mg / l 2 - {4-pyridyl) -3-ethylquinoline. The corrosion rate is 0.03 g / m2 h. The degree of protection of steel 3 in the presence of 2- {4-pyridyl) -3-ethyl quinone under the specified conditions is 95.2% .

Example 3. The corrosion rate of steel in the aqueous phase of the water-in-oil mixture (MMB: oil is 70:30. Coz 0.3-0.5) is 0.28 g / m2 h. The corrosion rate with the addition of 200 mg / l 2 - {4-pyridyl) -3-ethylquinoline 0.02 g / m h. The degree of protection in the presence of 200 mg / l of 2- (4-pyridyl) -3-ethyl quinoline is 92.9%.

The data illustrating the advantage of 2- (4-pyridyl) -3-ethylquinoline as a steel corrosion inhibitor in water-in-oil media in comparison with the prototype are shown in the table.

The test results indicate that the proposed compound is an effective inhibitor of steel corrosion in water-in-oil environments.

The advantages of the proposed corrosion inhibitor: a high degree of protection against corrosion (84-95.2%), in the prototype 56.8-71.8%; reduction of corrosion rate by 8-14 times, in the prototype - by 2-3.5 times.

The proposed steel corrosion inhibitor suggests the possibility of using it in the oil industry in systems for collecting and treating oil.

Claims (1)

Invention Formula 2- {4-Pyridyl) -3-ethylquinoline of formula Cjhs as a steel corrosion inhibitor in water-in-oil media.