Compounds and methods for inhibiting corrosion in hydrocarbon processing units

Patent metadata

Field	Value
Publication number	US-10253274-B2
Application number	US-201715707180-A
Country	US
Kind code	B2
Filing date	Sep 18, 2017
Priority date	May 10, 2012
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Treatment compositions for neutralizing acidic species and reducing hydrochloride and amine salts in a fluid hydrocarbon stream are disclosed. The treatment compositions may comprise at least one amine with a salt precipitation potential index of equal to or less than about 1.0. Methods for neutralizing acidic species and reducing deposits of hydrochloride and amine salts in a hydrocarbon refining process are also disclosed. The methods may comprise providing a fluid hydrocarbon stream and adding a treatment composition to the fluid hydrocarbon stream. The treatment compositions used may have a salt precipitation potential index of equal to or less than about 1.0 and comprise either water-soluble or oil-soluble amines.

First claim

What is claimed is:

1. A treatment composition for neutralizing acidic species and reducing hydrochloride and amine salts in a fluid hydrocarbon stream, said treatment composition comprising
(1) at least one oil soluble amine selected from the group consisting of N-methyldibutylamine, N-methyldipropylamine, diethylpropargylamine, wherein said oil soluble amine has a salt precipitation potential index of equal to or less than about 1.0; and optionally
(2) at least one water-soluble amine selected from the group consisting of dimethylpropylamine, 1,4-dimethyl piperazine, N-methylpyrrolidine and furfurylamine, wherein said water-soluble amine has a salt precipitation potential index of equal to or less than about 1.0,
wherein said treatment composition is present in a fluid hydrocarbon stream as 100% actives, or wherein said treatment composition is present in a solution and comprises about 5% to 95% weight based on a total weight of a solvent, wherein the solvent is an organic or an aqueous solvent.

2. The treatment composition of claim 1 , wherein said oil soluble amine has a pKa equal to or greater than about 5.0.

3. The treatment composition of claim 1 , wherein said oil soluble amine has a salt precipitation potential index of equal to or less than about 0.5.

4. The treatment composition of claim 1 , wherein said treatment composition further comprises an amine selected from the group consisting of di-ethylhydroxylamine, 1,2dimethylpropylamine, N,N,N′,N′-tetramethylethylenediamine (TMED), 2-dimethylamino 2-methyl 1-propanol, N-methyl piperidine, N, N, N′, N′-tetramethyldiaminomethane (TMMD), dimethyl tertiary butanolamine (DMTBA), dimethyl methoxypropylamine (DMMOPA), ethylhexylamine, dimethylcyclohexylamine, and combinations thereof.

5. The treatment composition of claim 1 , wherein said water- soluble amine has a pKa equal to or greater than about 5.0.

6. The treatment composition of claim 1 , wherein said water-soluble amine has a salt precipitation potential index of equal to or less than about 0.5.

7. The treatment composition of claim 1 , wherein said treatment composition is present in a solution and comprises about 25% to 75% weight based on a total weight of a solvent.

8. The treatment composition of claim 1 , wherein said treatment composition is present in a solution and comprises about 40% to 60% weight based on a total weight of a solvent.

9. The treatment composition of claim 1 , wherein said solvent is selected from the group consisting of water, naphtha, heavy aromatic naphtha, pentane, cyclopentane, hexane, cyclohexane, benzene, ethyl benzene, 1,2,4-trimethyl benzene, toluene, xylene, cumene, 1,4-dioxane, chloroform, diethyl ether, and methyl esters of fatty acids.

10. A method for neutralizing acidic species and reducing hydrochloride and amine salts in a fluid hydrocarbon stream, the method comprising adding a treatment composition to said fluid hydrocarbon said treatment composition comprising:
(1) at least one oil soluble amine selected from the group consisting of N-methyldibutylamine, N-methyldipropylamine, diethylpropargylamine, wherein said oil soluble amine has a salt precipitation potential index of equal to or less than about 1.0; and optionally
(2) at least one water-soluble amine selected from the group consisting of dimethylpropylamine, 1,4-dimethyl piperazine, N-methylpyrrolidine and furfurylamine, wherein said water-soluble amine has a salt precipitation potential index of equal to or less than about 1.0,
wherein said treatment composition is added to said fluid hydrocarbon stream as 100% actives, or wherein said treatment composition is present in a solution and comprises about 5% to 95% weight based on a total weight of a solvent, wherein the solvent is an organic or an aqueous solvent.

11. The method of claim 10 , wherein said treatment composition is added to said fluid hydrocarbon stream after said fluid hydrocarbon stream leaves a distillation tower of a hydrocarbon refining process.

12. The method of claim 10 , wherein said treatment composition is added to a fluid hydrocarbon stream in an amount of from 1 to about 1,000 ppm by volume of said fluid hydrocarbon stream.

13. The method of claim 10 , wherein said treatment composition is added to said fluid hydrocarbon stream after said fluid hydrocarbon stream leaves a desalter of a hydrocarbon refining process.

14. The method of claim 10 , wherein said treatment composition further comprises an amine selected from the group consisting of di-ethylhydroxylamine, 1,2dimethylpropylamine, N,N,N′,N′-tetramethylethylenediamine (TMED), 2-dimethylamino 2-methyl 1-propanol, N-methyl piperidine, N, N, N′, N′-tetramethyldiaminomethane (TMMD), dimethyl methoxypropylamine (DMMOPA), ethylhexylamine, dimethylcyclohexylamine, and combinations thereof.

Assignees

• Gen Electric

Inventors

• Subbiah Alagarsamy
• Devi Rebika Mayanglambam
• Patel Nimeshkumar Kantilal
• Nagu Muthukumar
• Ghosh Romit
• Kesavan Sathees
• Shetty Ashok Shankar
• Joshi Manish

Classifications

• C10G75/04 Primary

  by addition of antifouling agents · CPC title

• C10G19/073

  with solid alkaline material · CPC title

• C07C211/10

  Diaminoethanes · CPC title

• C10G7/10

  Inhibiting corrosion during distillation · CPC title

• C07C211/34

  of a saturated carbon skeleton · CPC title