Inhibition of deposition of hydrocarbonaceous solids from oil

Claim 1

THE METHOD OF INHIBITING THE ADHESION OF SOLID HYDROCARBONACEOUS MATERIAL, DEPOSITED ON SURFACES FROM OIL CONTAINING SUCH SUBSTANCES IN SOLUTION OR SUSPENSION IN CONTACT THEREWITH, WHICH CONSISTS ESSENTIALLY OF FLUSHING SAID SURFACES WITH AN AQUEOUS DISPERSION OF AN AGENT WHICH YIELDS OH IONS IN AN AQUEOUS MEDIUM AND SUBJECTING THE THUS FLUSHED SURFACES TO THE ACTION OF AN AQUEOUS SOLUTION CONTAINING BETWEEN 5 AND 1000 PARTS, PER MILLION PARTS AQUEOUS SOLUTION, OF A POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 SELECTED FROM THE CLASS CONSISTING OF HOMOPOLYMERS OF N-VINYL-ALKYL-2-OXAZOLIDINONE; COPOLYMERS OF N-VINYL-ALKYL-2-OXAZOLIDINONES AND A MONOMER SELECTED FROM THE CLASS CONSISTING OF MALEIC AMHYDRIDE, SODIUM STYRENE SULFONATE, SODIUM VINYL TOLUENE SULFONATE, AND ALKYL ACRYLIC ACIDS; ALKALI SALTS OF COPOLYMERS OF N-VINYL-2-OXAZOLIDINONES AND MALEIC ANHYDRIDE; COPOLYMERS OF VINYLMORPHOLINONE AND MALEIC ANHYDRIDE AND ALKALI SALTS THEREOF; COPOLYMERS OF VINYLPYRROLIDONE AND A MONOMER SELECTED FROM THE CLASS CONSISTING OF MALEIC ANHYDRIDE AND VINYL ACETATE; COPOLYMERS OF ETHYLENE AND MALEIC ANHYDRIDE; COPOLYMERS OF ETHYLENE AND MALEIC ACID; AND ALKALI AMIDE SALTS OF COPOLYMERS OF ETHYLENE AND MALEIC ANHYDRIDE, EACH OF SAID ALKYL SUBSTITUENT BEING SELECTED FROM METHYL AND ETHYL AND SAID ALKALI SALTS BEING SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM SALTS.

Claim 2

THE METHOD OF INHIBITING THE ADHESION OF SOLID HYDROCARBONACEOUS MATERIAL, DEPOSITED ON SURFACES FROM OIL CONTAINING SUCH SUBSTANCES IN SOLUTION OR SUSPENSION IN CONTACT THEREWITH, WHICH CONSISTS ESSENTIALLY OF FLUSHING SAID SURFACES WITH AN AQUEOUS DISPERSION OF AN AGENT WHICH YIELDS OH IONS IN AN AQUEOUS MEDIUM AND SUBJECTING THE THUS FLUSHED SURFACES TO THE ACTION OF AN AQUEOUS SOLUTION CONTAINING BETWEEN 5 AND 1000 PARTS, PER MILLION PARTS AQUEOUS SOLUTION, OF A POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 SELECTED FROM THE CLASS CONSISTING OF HOMOPOLYMERS OF N-VINYL-ALKYL-2-OXAZOLIDINONE; COPOLYMERS OF N-VINYL-ALKYL-2-OXAZOLIDINONES AND A MONOMER SELECTED FROM THE CLASS CONSISTING OF MALEIC AMHYDRIDE, SODIUM STYRENE SULFONATE, SODIUM VINYL TOLUENE SULFONATE, AND ALKYL ACRYLIC ACIDS; ALKALI SALTS OF COPOLYMERS OF N-VINYL-2-OXAZOLIDINONES AND MALEIC ANHYDRIDE; COPOLYMERS OF VINYLMORPHOLINONE AND MALEIC ANHYDRIDE AND ALKALI SALTS THEREOF; COPOLYMERS OF VINYLPYRROLIDONE AND A MONOMER SELECTED FROM THE CLASS CONSISTING OF MALEIC ANHYDRIDE AND VINYL ACETATE; COPOLYMERS OF ETHYLENE AND MALEIC ANHYDRIDE; COPOLYMERS OF ETHYLENE AND MALEIC ACID; AND ALKALI AMIDE SALTS OF COPOLYMERS OF ETHYLENE AND MALEIC ANHYDRIDE, EACH OF SAID ALKYL SUBSTITUENT BEING SELECTED FROM METHYL AND ETHYL AND SAID ALKALI SALTS BEING SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM SALTS.