Method for regenerating scale solvent
Patent
·
OSTI ID:7233742
This patent describes improvement in the method for removing alkaline earth sulfate scale by contacting the scale with an aqueous solvent having a pH of about 8 to abut 14 and comprising a chelating agent comprising a polyaminopolycarboxylic acid or salt of such an acid, and a synergist anion. The improvement comprises removing alkaline earth sulfate scale dissolved in the aqueous solvent by: acidifying the aqueous solvent containing dissolved scale sufficiently to generate free alkaline earth metal ions without forming an insoluble alkaline earth precipitate; mixing the aqueous solvent with a liquid hydrocarbonaceous membrane phase containing a soluble surfactant and an oil soluble emulsifier, the liquid membrane emulsion enveloped around droplets of an internal aqueous phase comprising an aqueous solution having a pH of from about 8 to about 14 and a chelating agent comprising a polyaminopolycarboxylic acid or a salt of such an acid, wherein the free alkaline earth ions transfer from the solvent into the hydrocarbonaceous membrane and into the internal aqueous phase where the ions are removed by the chelating agent; and recovering the aqueous solvent and increasing the pH of the aqueous solvent to a value of about 10 to about 14 to produce a regenerated aqueous solvent for reuse.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (United States)
- Patent Number(s):
- US 5087371; A
- Application Number:
- PPN: US 7-612728
- OSTI ID:
- 7233742
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
CONTROL
CORROSION INHIBITORS
EXTRACTION
INDUSTRIAL PLANTS
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OIL WELLS
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
PH VALUE
REACTION KINETICS
SCALE CONTROL
SEPARATION PROCESSES
SOLVENT EXTRACTION
SULFATES
SULFUR COMPOUNDS
WELLS
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
CONTROL
CORROSION INHIBITORS
EXTRACTION
INDUSTRIAL PLANTS
KINETICS
OIL WELLS
OXYGEN COMPOUNDS
PETROLEUM REFINERIES
PH VALUE
REACTION KINETICS
SCALE CONTROL
SEPARATION PROCESSES
SOLVENT EXTRACTION
SULFATES
SULFUR COMPOUNDS
WELLS