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US 4,069,161 AGranted
Preparation of aqueous solutions of polyacrylamides
OwnerRichard J. Pogersinventor
Life of this patent
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Abstract
Polymer gel, e.g. polyacrylamide gel, is chilled until frozen and is ground up in a mill. The frozen particles of the polymer gel are then dissolved in water to form an aqueous solution having good efficiency in the recovery of petroleum from formations.
Claims5
In a process for the production of aqueous solutions of polymer, the improvement comprising:
- a. chilling, until frozen, a gel of a polymer selected from the group consisting of polyacrylamide, hydroxyethyl cellulose, vinyl acetate-crotonic acid polymer, and polyvinyl acetate/polyvinyl pyrrolidone to within a temperature range of about -30 to about -320.degree. F.,
- b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns,
- c. dissolving the ground particles of the polymer gel in water.
In a process for the production of aqueous solutions of polyacrylamide, the improvement comprising:
- a. chilling, until frozen, a gel of polyacrylamide to within a temperature range of from about -30.degree. to about -320.degree. F.,
- b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns,
- c. dissolving the ground particles of the polymer gel in water.
A process for the production of aqueous solutions of polyacrylamide polymer, the improvement comprising in combination:
- a. placing polyacrylamide gel into direct contact with a suitable refrigerant to chill the gel to a temperature of about -30.degree. to about -320.degree. F. until frozen,
- b. grinding the gel while frozen to form particles of polyacrylamide having average particle size in the range of from about 250 to about 1000 microns,
- c. dissolving the ground particles of polyacrylamide gel in water.
Dependencies are inferred from the claim text.