Fluid handling – Processes – Affecting flow by the addition of material or energy
Reexamination Certificate
2006-01-17
2006-01-17
Pham, Minh-Chau T. (Department: 1724)
Fluid handling
Processes
Affecting flow by the addition of material or energy
C210S235000, C210S236000, C210S634000, C210S638000, C210S709000, C210S712000, C210S724000, C210S748080, C210S912000, C423S150100, C585S818000
Reexamination Certificate
active
06986358
ABSTRACT:
The levels of iron sulfide present in a conduit, such as a pipeline, are reduced by contacting the conduit, on an inner surface, with a composition obtained from an aqueous solution containing at least one compound of Formula (I)and at least one amine or corresponding ammonium derivative in the presence of a solvent, wherein X is an anion of valency n. Preferably, the pH of the solution is about 8. Alternatively, the method employs a composition comprising tris(hydroxymethyl)phosphine (TRIS) and at least one amine or corresponding ammonium derivative. The amine preferably is ammonia or a primary alkylamine. The compositions readily complex and thereby dissolve deposits of iron(II) sulfide, removing them from the conduit.
REFERENCES:
patent: 3030421 (1962-04-01), Reuter et al.
patent: 3947276 (1976-03-01), Siclari et al.
patent: 4044055 (1977-08-01), Katz
patent: 4078101 (1978-03-01), Cole
patent: 4370236 (1983-01-01), Ferguson
patent: 4874526 (1989-10-01), Grade et al.
patent: 4931164 (1990-06-01), Dickakian
patent: 5127231 (1992-07-01), Larue et al.
patent: 5190662 (1993-03-01), Keller et al.
patent: 5500126 (1996-03-01), Fries
patent: 5820766 (1998-10-01), Gevertz et al.
patent: 6001264 (1999-12-01), Suzuki et al.
patent: 6153100 (2000-11-01), Mitchell
patent: 6177047 (2001-01-01), Kuczynski et al.
patent: 6905605 (2005-06-01), Klomp
patent: 2 145 708 (1985-04-01), None
patent: WO 99/23261 (1999-05-01), None
patent: WO 00/21892 (2000-04-01), None
patent: WO 02/08127 (2002-01-01), None
Krauter, et al., “An Easy and Practical Synthetic Route to Electron Rich Water Soluble Ligands: α-Aminomethylation of Trishydroxymethylphosphine,”Tetrahedron, 56:771-774 (2000), Elsevier Science Ltd., Great Britain.
Jeffery, et al., “Self assembly of a novel water soluble iron(II) macrocyclic phosphine complex from tetrakis(hydroxymethyl)phosphonium sulfate and iron (II) ammonium sulfate: single crystal X-ray structure of the complex [Fe(H2O)2{RP(CH2N(CH2PR2)CH2)2PR}]SO44H2O (R=CH2OH)”,Chem. Commun., 101-102 (2000), The Royal Society of Chemistry, Great Britain.
Gilbert, et al., “Tetrakishydroxymethylphosphonium Sulfate (THPS) For Dissolving Iron Sulfides Downhole and Topside—A Study of the Chemistry Influencing Dissolution,”Corrosion 2002, Paper No. 02030 (2002), NACE International, USA.
Mattox Mark Andrew
Valente Edward J.
Foley & Lardner LLP
Pham Minh-Chau T.
Synergy Chemical Inc.
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