Corrosion and/or scale inhibition

• US 5,294,371 A
• Filed: 10/21/1992
• Issued: 03/15/1994
• Est. Priority Date: 11/23/1991
• Status: Expired due to Fees

• Current Assignee: FMC Corp UK Ltd (TechnipFMC, plc)
• Original Assignee: FMC Corporation
• Inventors: Rideout, Jan, Clubley, Brian G.
• Primary Examiner(s): Stoll, Robert L.
• Assistant Examiner(s): Fee, Valerie
• Application Number:
  US07/964,584
• Time in Patent Office: 510 Days
• Field of Search: 252/180, 252/389.23, 210/699, 422/15, 422/17, 562/24
• US Class Current: 252/389.23
• CPC Class Codes: C02F 2303/08 Corrosion inhibition
• CPC Class Codes: C02F 5/14 containing phosphorus
• CPC Class Codes: C02F 5/145 combined with inorganic substances
• CPC Class Codes: C07F 9/4816 Acyclic saturated acids or derivatices which can have further substituents on alkyl
• CPC Class Codes: C23F 11/08 in other liquids
• CPC Class Codes: C23F 11/167 Phosphorus-containing compounds
• CPC Class Codes: C23F 14/02 by chemical means

Abstract

A corrosion- and/or scale inhibitor composition comprising: A) a corrosion- and/or scale inhibitor; and B) a compound having the formula (I): ##STR1## or a water-soluble salt thereof in which R₁ is hydrogen or methyl, the weight ratio of component A) to component B), ranging from 10:90 to 90:10.

The compounds of formula I are new compounds.

Claims

1. A corrosion- and/or scale inhibitor composition comprising:

A) a corrosion- and/or scale inhibitor; and

B) a compound having the formula (I);

##STR4## or a water-soluble salt thereof, in which R₁ is hydrogen or methyl the weight ratio of component A) to component B) ranging from 10;

90 to 90;

10.

2. A composition according to claim 1 in which the weight ratio of component A) to component B) ranges from 20:

80 to 80;

20.

3. A composition according to claim 2 in which the weight ratio of component A) to component B) ranges from 40:

60 to 60;

40.

4. A composition according to claim 1 in which component A) is a phosphonocarboxylic acid having the formula II:

##STR5## or a water-soluble salt thereof, in which R₂ is CO₂ H, P(═

O)(OH)₂, CH₂ P(═

O)(OH)₂, CH₂ CH₂ P(═

O)(OH)₂ or NR₅ R₆ in which R₅ and R₆ are the same or different and each is C(R₇)₂ P(═

O)(OH)₂ or C(R₇)₂ CO₂ H in which R₇ is hydrogen or methyl;

R₃ is hydrogen, C₁ -C₆ alkyl, CH₂ CO₂ H or CH₂ CH₂ CO₂ H; and

R₄ is hydrogen, hydroxyl, CO₂ H, P(═

O)(OH)₂, CH₂ CO₂ H or CH₂ CH₂ CO₂ H.

5. A composition according to claim 4 in which R₂ is CO₂ H or P(═

O)(OH)₂ ;

R₃ is hydrogen; and

R₄ is hydroxyl.

6. A composition according to claim 4 in which the compound of formula II is

phosphonoacetic acid,

2-phosphonopropionic acid,

2-phosphonoheptanoic acid,

2-hydroxy phosphonoacetic acid,

2-hydroxy-2-methyl phosphonoacetic acid,

2-hydroxy-2-butyl phosphonoacetic acid,

3-phosphono-3-hydroxy butyric acid,

2-phosphonoethane-1,2-dicarboxylic acid,

2-phosphono-butane-1,2,4-tricarboxylic acid,

methane diphosphonic acid,

1,2-ethanediphosphonic acid,

1,3-propanediphosphonic acid,

hydroxymethyl diphosphonic acid,

hydroxyethyl diphosphonic acid (HEDP),

2-amino-phosphonoacetic acid,

2-amino-2-methyl phosphonoacetic acid,

nitrilo-tris-methylene phosphonic acid,

methylamino-bis-methylene phosphonic acid,

phosphonomethyl glycine,

bis-phosphonomethyl glycine,

phosphonomethylimino diacetic acid or

aminoethyl-1,1-diphosphonic acid.

7. A composition according to claim 1 in which component A) is a phosphate, an aminopolyphosphonic acid or a triazine.

8. A composition according to claim 7 in which the phosphate is sodium phosphate, the aminopolyphosphonic acid is amino tris(phosphonic acid) and the triazine is 2,4,6-tris(5'"'"'-carboxypentylamino)-1,3,5-triazine.

9. A process for inhibiting corrosion and/or scale in an aqueous system comprising incorporating into the aqueous system a corrosion- and/or scale inhibiting amount of an inhibitor composition as claimed in any one of claims 1 to 8.

10. A process according to claim 9 in which the inhibitor composition is added in an amount of from 0.1 to 50,000 ppm based on the weight of the aqueous system.

11. A process according to claim 10 in which the inhibitor composition is added in an amount from 1 to 500 ppm based on the weight of the aqueous system.

12. A process according to claim 9 in which the aqueous system treated is that comprised in a cooling water system, a steam generating system, a sea water evaporator, reverse osmosis equipment, bottle washing plants, paper manufacturing equipment, sugar evaporator equipment, soil irrigation systems, hydrostatic cookers, gas scrubbing systems, closed circuit heating systems, aqueous-based refrigeration systems, down-well systems, aqueous machining fluid formulations, aqueous scouring systems, aqueous glycol anti-freeze systems, water/glycol hydraulic fluids or aqueous-based polymer surface coating systems.

13. A process according to claim 9 in which the inhibitor composition is used in conjunction with one or more further corrosion inhibitors, metal deactivators, scale inhibitors/dispersing agents, threshold agents, precipitating agents, oxygen scavengers, sequestering agents, anti-foaming agents, and biocides.

14. A process according to claim 9 in which the aqueous system contains chlorine or a chlorine-producing agent.

15. A compound having the formula I ##STR6## or a water-soluble salt thereof, in which R is hydrogen or methyl.