Corrosion inhibition composition for pipelines, process of elaboration and synthesis

Patent metadata

Field	Value
Publication number	US-10011908-B2
Application number	US-201414526152-A
Country	US
Kind code	B2
Filing date	Oct 28, 2014
Priority date	Oct 29, 2013
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Compounds and compositions are used as corrosion inhibitors for pipelines for crude oil containing water with high salt concentrations. The inhibitors are ionic liquids, imidazoles, benzotriazoles, and mixtures thereof. The composition includes two or more members of the inhibitors with a solvent. The inhibitors reduce corrosion of metallic surfaces of the pipelines containing crude oil having 0.2 and 40 wt % water, 10,000 to 70,000 ppm salt, and 9 to 600 ppm hydrogen sulfide. A synergic effect is provided by two or more different inhibitors. This synergy is derived from interactions with the metallic surface, among themselves or with the corrosive medium depending on the chain length, to inhibit the corrosion with decrease of the formulation dose. The composition can be a ternary formulation of the three families or two components of one family and a third component of a different family.

First claim

What is claimed is:

1. A method of inhibiting corrosion of metal surfaces in contact with crude oil, said method comprising the step of adding a corrosion inhibiting composition to the crude oil in contact with the metal surfaces, wherein said corrosion inhibiting composition comprises a mixture of at least two different corrosion inhibiting compounds selected from the group consisting of imidazoles and benzotriazoles, said imidazoles having the formula:

wherein R is a saturated or unsaturated hydrophobic hydrocarbon chain containing 2 to 25 carbon atoms and can be linear or branched; and R 1 is hydrogen or a linear or branched alkyl radical containing from 1 to 5 carbon atoms; and
said benzotriazoles having the formula:

wherein R is a saturated or unsaturated hydrophobic hydrocarbon chain containing 2 to 25 carbon atoms and can be linear or branched.

2. The method of claim 1 , wherein said crude oil contains 0.4 to 40% by wt. water and 10,000 to 70,000 ppm inorganic salts, and contains dissolved H 2 S and oxygen.

3. The method of claim 1 , wherein said mixture is selected from the group consisting of;
a first imidazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon R 1 is H or a linear or branched alkyl C 1 to C 5 hydrocarbon and a second imidazole where R is a saturated or unsaturated hydrophobic C 11-25 hydrocarbon and R 1 is H or a linear or branched alkyl C 1 to C 5 hydrocarbon; and
a first benzotriazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon and a second benzotriazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

4. The method according to claim 1 , wherein said corrosion inhibiting composition is dispersed in crude oil having a water concentration from 0.2 to 40% by weight; a salt concentration of 10,000 to 70,000 ppm and hydrogen sulfide concentration from 0 and 600 ppm.

5. The method according to claim 1 , wherein said corrosion inhibiting composition is added to said crude oil in an amount of 500 to 2500 mg/L based on the amount of the crude oil.

6. The method of claim 1 , where said mixture comprises a first imidazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon and a second imidazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

7. The method of claim 1 , where said corrosion inhibiting mixture comprises a first benzotriazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon and a second benzotriazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

8. The method of claim 1 , wherein said mixture comprises a first imidazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon and said a first benzotriazole where R is a saturated or unsaturated hydrophobic C 2 to C 11 hydrocarbon.

9. A method of inhibiting corrosion on metal surface in contact with crude oil, said method comprising the step of adding a corrosion inhibiting composition to the crude oil in contact with the metal surfaces, wherein said corrosion inhibiting composition comprises a mixture selected from the group consisting of;
at least one imidazoles and at least one benzotriazoles;
at least one imidazoles and at least one ionic liquids;
at least one benzotriazoles and at least one ionic liquids; and
at least one imidazoles, at least one benzotriazoles and at least one ionic liquid,
wherein said ionic liquid having the formula

where R is a linear or branched saturated or unsaturated hydrophobic hydrocarbon chain containing 2 to 25 carbon atoms; and R 1 is hydrogen or a linear or branched alkyl radical containing from 1 to 5 carbon atoms, and X is Cl, Br or I, and
said imidazole having the formula:

wherein R is a saturated or unsaturated hydrophobic hydrocarbon chain containing 2 to 25 carbon atoms and can be linear or branched; and R 1 is hydrogen or a linear or branched alkyl radical containing from 1 to 5 carbon atoms; and
said benzotriazole having the formula:

wherein R is a saturated or unsaturated hydrophobic hydrocarbon chain containing 2 to 25 carbon atoms and can be linear or branched.

10. The method of claim 9 , wherein said at least one ionic liquid comprises a first ionic liquid where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon and a second ionic liquid where R is a C 11 to C 25 hydrocarbon.

11. The method of claim 9 , wherein said mixture comprises said at least one imidazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon and said at least one ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

12. The method of claim 9 , wherein said mixture comprises said at least one benzotriazole where R is a saturated or unsaturated hydrophobic C ii to C 25 hydrocarbon and said at least one ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

13. The method of claim 9 , wherein said mixture is selected from the group consisting of
a mixture of a first imidazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon, a second imidazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon, and said ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon;
a mixture of a first imidazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon, a second imidazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon, and said ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon;
a mixture of a first benzotriazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon, a second benzotriazole where R is a saturated or unsaturated hydrophobic C to C 25 hydrocarbon, and said ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic to C 10 hydrocarbon; and
a mixture of a first benzotriazole where R is a saturated or unsaturated hydrophobic C 2 to C 10 hydrocarbon, a second benzotriazole where R is a saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon and said ionic liquid where R is a linear or branched saturated or unsaturated hydrophobic C 11 to C 25 hydrocarbon.

Assignees

• Mexicano Inst Petrol

Inventors

• Marin Cruz Jesus
• Vega Paz Araceli
• Montiel Sanchez Luisa Elena
• Castillo Cervantes Salvador
• Martinez Palou Rafael
• Estrada Martinez Arquimedes
• Quej Ake Luis Manuel
• Benitez Aguilar Jose Luis Rodolfo
• Sanchez Garcia Veronica

Classifications

• C09K8/54

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title

• C23F11/141

  Amines; Quaternary ammonium compounds · CPC title

• C07D233/58

  with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring nitrogen atoms · CPC title

• C23F11/149 Primary

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C07D249/18

  Benzotriazoles · CPC title