Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1990-10-05
1993-08-10
Spear, Frank
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
210724, B01D 4300
Patent
active
052346021
ABSTRACT:
Barium sulfate scale is dissolved by contacting the scale with an aqueous solvent having a pH of about 10 to about 14, preferably about 12, and comprising a chelating agent comprising a polyaminopolycarboxylic acid or salt of such an acid, and a synergist anion. The solvent containing the dissolved scale is regenerated by acidifying the solvent in the presence of an anion which forms a precipitate of an insoluble salt of the alkaline earth metal of the dissolved scale. The precipitate is then removed from the solvent. Thereafter, the pH of the solvent is increased to a pH of about 10 to about 14, preferably about 12, to recover a regenerated solvent for reuse, in dissolving scale.
REFERENCES:
patent: 4973201 (1990-11-01), Paul et al.
Morris Richard L.
Paul James M.
McKillop Alexander J.
Miller Lawrence O.
Mobil Oil Corporation
Spear Frank
Speciale Charles J.
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