Sulfate scale dissolution

Patent · Tue Jan 28 04:00:00 EST 1992

OSTI ID:5275326

Morris, R L; Paul, J M

This patent describes a method for removing barium sulfate scale. It comprises contacting the scale with an aqueous solution having a pH of about 8 to about 14 and consisting essentially of a chelating agent comprising a polyaminopolycarboxylic acid or salt of such an acid in a concentration of 0.1 to 1.0 M, and anions of a monocarboxylic acid selected form mercaptoacetic acid, hydroxyacetic acid, aminoacetic acid, or salicyclic acid in a concentration of 0.1 to 1.0 M and which is soluble in the solution under the selected pH conditions, to dissolve the scale.

• Assignee: Mobil Oil Corp., Fairfax, VA (United States)
• Patent Number(s): US 5084105; A
• Application Number: PPN: US 7-431114
• OSTI ID: 5275326
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETIC ACID
ALKALINE EARTH METAL COMPOUNDS
AMINO ACIDS
AQUEOUS SOLUTIONS
BARIUM COMPOUNDS
BARIUM SULFATES
CARBOXYLIC ACIDS
CHELATING AGENTS
CONCENTRATION RATIO
DISPERSIONS
DISSOLUTION
GLYCINE
HYDROXY ACIDS
HYDROXY COMPOUNDS
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PH VALUE
POLYMERS
REMOVAL
SALICYLIC ACID
SALTS
SOLUTIONS
SULFATES
SULFUR COMPOUNDS