Compounds and methods for inhibiting corrosion in hydrocarbon processing units

Patent metadata

Field	Value
Publication number	US-9803149-B2
Application number	US-201314068068-A
Country	US
Kind code	B2
Filing date	Oct 31, 2013
Priority date	May 10, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

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 method for neutralizing acidic species and reducing deposits of hydrochloride and amine salts in a hydrocarbon refining process comprising:
(a) contacting a fluid hydrocarbon stream present in said refining process with a first treatment composition after said fluid hydrocarbon stream leaves a desalter of said hydrocarbon refining process, said first treatment composition comprising at least one oil-soluble amine with a salt precipitation potential index of equal to or less than about 1.0; and
(b) adding a second treatment composition to said fluid hydrocarbon stream after said fluid hydrocarbon stream leaves a distillation tower of said hydrocarbon refining process, said second treatment composition comprising at least one water-soluble amine with a salt precipitation potential index of equal to or less than about 1.0;

wherein said at least one water-soluble amine is a member selected from the group consisting of 1,2 dimethylpropylamine, 1,4-dimethylpiperazine, N-methylpyrrolidine, di-ethylhydroxylamine, dimethyl-N-propylamine, N,N,N′,N′-tetramethylethylenediamine (TMED), 2-dimethylamino 2-methyl 1-propanol (DMAMP), N-methyl piperidine, N, N, N′, N′-tetramethyldiaminomethane (TMMD), dimethyl tertiary butanolamine (DMTBA), dimethyl methoxypropylamine (DMMOPA), furfurylamine, and combinations thereof.

2. The method in claim 1 , wherein said water-soluble amine comprises 1,4-dimethylpiperazine and/or N-methylpyrrolidine.

3. The method of claim 1 , wherein said at least one oil-soluble amine is a member selected from the group consisting of N-methyldibutylamine, N-methyldipropylamine, ethylhexylamine, dimethylcyclohexylamine, di-ethylpropargylamine, di-N-propylamine, and combinations thereof.

4. The method of claim 1 , wherein said at least one water-soluble amine has a pKa equal to or greater than about 5.0.

5. The method of claim 1 , wherein said at least one oil-soluble amine has a pKa equal to or greater than about 5.0.

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

7. The method of claim 1 , wherein said at least one oil-soluble amine has a salt precipitation potential index of equal to or less than about 0.5.

Assignees

• Gen Electric

Inventors

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

Classifications

• C07C211/34

  of a saturated carbon skeleton · CPC title

• C07C211/11

  Diaminopropanes · CPC title

• C07C211/10

  Diaminoethanes · CPC title

• C07C211/09

  Diamines · CPC title

• C07C211/03

  Monoamines · CPC title