Composition useful in sulfate scale removal
AssigneeDorf Ketal Chemicals Fze
InventorsClay Purdy, Markus Weissenberger, Stig Magnor Nordaa, Adrienne Lee
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Abstract
The present invention discloses a novel aqueous composition for use in removing petroleum-contaminated barium sulfate scale from a surface contaminated with such, said composition comprising: a chelating agent and a counterion component selected from the group consisting of: Li5DTPA; Na5DTPA; K5DTPA; Cs5DTPA; Na4EDTA; K4EDTA; TEAH4DTPA; and TBAH5DTPA; a scale removal enhancer; and a non-ionic surfactant. There is also disclosed methods to use such compositions.
Claims12
An aqueous composition for use in removing petroleum-contaminated barium sulfate scale from a surface contaminated with such, said composition consisting of:
- a chelating agent having chelating agent components, said chelating agent components including Ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), Tetraethylammonium hydroxide (TEAR), and Tetrabutylammonium hydroxide (TBAH)
- said chelating agent and a counterion component selected from the group consisting of:
- Na5DTPA;
- K5DTPA;
- Cs5DTPA;
- Na4EDTA;
- K4EDTA;
- TEAH4DTPA;
- and TBAH5DTPA;
- a scale removal enhancer;
- a non-ionic surfactant;
- distilled water;
- potassium hydroxide;
- and
- wherein the non-ionic surfactant is a linear alcohol ethoxylate surfactant having a chain length of at least 6 carbon atoms and wherein said aqueous composition has a pH ranging from 10 to 11.
Dependencies are inferred from the claim text.