Branched alkyl acrylamide types of polymer-zinc corrosion inhibitor

Patent · Tue Jan 10 04:00:00 EST 1989

OSTI ID:6237034

Crucil, G A; Blaser, L J

A composition is described for preventing corrosion and scale in aqueous recirculating systems which consists essentially of an aqueous solution having a pH within the range 2.0-13.5 and containing at least 2 ppm of 2-phosphono-butane-1,2,4 - tricarboxylic acid, or its water-soluble salts and containing a water-soluble zinc-polymer complex having a zinc:polymer weight ratio with the range 1:3 to about 1:20. Also dissolved therein is a water-soluble orthophosphate ion source in which the zinc:orthophosphate ion weight ratio is between about 1:1 to about 1:5, and wherein the polymer is a nitrogen-containing zinc-complexing polymer having a molecular weight between about 2500-25,000 and is chosen from the group consisting of water-soluble terpolymers containing from 20-80 percent by weight acrylic acid, or its water-soluble salts, 10-40 weight percent methacrylic acid, or its water-soluble salts, and at least two (2) weight percent of an N-alkylated acrylamide monomer, wherein the nitrogen substituted alkyl group contains from 3-12 carbon atoms and wherein the nitrogen substituted alkyl group is branched.

• Assignee: Nalco Chemical Co., Naperville, IL
• Patent Number(s): US 4797224
• OSTI ID: 6237034
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
ACRYLAMIDE
ACRYLIC ACID
ALKANES
ALKYL RADICALS
AMIDES
AQUEOUS SOLUTIONS
BUTANE
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CIRCULATING SYSTEMS
COMPLEXES
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSION RESISTANCE
DISPERSIONS
HYDROCARBONS
MIXTURES
MONOCARBOXYLIC ACIDS
MONOMERS
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLYMERS
RADICALS
SALTS
SOLUBILITY
SOLUTIONS
ZINC COMPLEXES