Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Reexamination Certificate
2005-03-15
2005-03-15
Markoff, Alexander (Department: 1746)
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
C134S022130, C134S022140, C134S022160
Reexamination Certificate
active
06866048
ABSTRACT:
This invention provides a method of treating a dry or processed fluid pipe line susceptible to the build-up of iron sulfide deposits by complexing the iron sulfide in the pipe lines. The method of the present invention introduces the composition on a continuous or a batch basis to a gas pipe line. The composition is made of a solution of 1) water, 2) [tetrakis(hydroxymethyl)phosphonium]sulfate or chloride, and 3) a soluble ammonium salt, such as ammonium chloride or the like.
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Larsen, Jan; Sanders, Peter F.; Talbot, Robert E.; “Experience with the Use of Tetrakishydroxymethylphosphonium Sulfate (THPS) for the Control of Downhole Hydrogen Sulfide,”Corrosion 2000(2000) pp. 1-18.
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Haack, T.; Diaz, R.; Talbot, Dr. R.E.: “TetrakisHydroxymethyl Phosphonium Sulfate (THPS): A New Oilfield Bactericide Providing Iron Sulfide Dissolution and Environmental Benefits”, presented at Exitep 98, Mexico City, Nov. 15-16, 1998.
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Foley & Lardner LLP
Markoff Alexander
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