IP Library › Granted Patent US 7,008,561
Granted Patent B2
US 7,008,561 · App. 10/477,477 · Granted Mar 7, 2006

Ether carboxylic acids based on alkoxylated mercaptobenzothiazoles and use of the same as corrosion inhibitors

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Quick Facts
Patent No.
US 7,008,561
App. No.
10/477,477
Granted
Mar 7, 2006
Kind
B2
Abstract

The present invention relates to compounds of formula (1) and the salts thereof which correspond to formula (2). In the formulae, A is C 2 - to C 4 -alkylene, x is a number from 1 to 100, y is a number from 1 to 4, and R is a cation. The compound of formula (1) and/or formula (2) forms a persistent film on metal surfaces, particularly on metal surfaces under stress in metal working and in the operation of crude oil and natural gas processing.

Claims (15)

1. A compound of the formula (1)

and salts thereof of the formula 2

in which

A is C 2 - to C 4 -alkylene,

x is a number from 1 to 100, and

y is a number from 1 to 4, and

R is a cation.

2. The compound as claimed in claim 1 , in which A is propylene and/or ethylene.

3. The compound of claim 1 , in which x is a number between 2 and 70.

4. The compound of claim 1 , in which R is a cation selected from the group consisting of hydrogen, an alkali metal ion, alkaline earth metal ion, a substituted ammonium ion, and mixtures thereof.

5. The compound of claim 1 , in which y is 1 or 2.

6. A method for inhibiting corrosion of a metal comprising contacting the metal with the compound of claim 1 .

7. A method for inhibiting corrosion in crude oil and natural gas recovery and processing equipment and pipelines, said method comprising forming a film of the compound of claim 1 in said equipment and pipelines.

8. A method for inhibiting the corrosion of a metal surface, said method comprising contacting the metal surface with the compound of claim 1 to provide an adhering film on said metal surface.

9. The method of claim 8 , wherein the metal is subject to metal working selected from the group consisting of grinding, cutting, boring and mixtures thereof.