Stabilized sodium erythorbate boiler corrosion inhibitor compositions and methods

Patent · Tue Jul 21 04:00:00 EDT 1987

OSTI ID:6184784

Walker, J L; Zupanovich, J D

This patent describes a method of inhibiting corrosion in boilers comprising adding to boiler feedwater containing oxygen an effective amount of a chelant-stabilized aqueous solution of sodium erythorbate. The chelant is selected from the group consisting of nitrilotriacetic acid, ethylenediamine tetraacetic acid, N(hydroxyethyl)ethylenediamine triacetic acid, citric acid, and salts where the chelant is present at a chelant:sodium erythorbate weight ratio of from about 0.001:1 to 1:1, based on active sodium erythorbate. The composition comprises: (a) an aqueous solution of sodium erythorbate and (b) a chelant selected from the group consisting of nitrilotriacetic acid, ethylenediamine tetraacetic acid, N(hydroxyethyl)ethylenediamine triacetic acid, citric acid, and salts, where the chelant is present at a chelant:sodium erythorbate weight ratio of from about 0.001:1 to 1:1, based on active sodium erythorbate, and where the sodium erythorbate is stabilized by the chelant against oxidative degradation.

• Assignee: Calgon Corp., Pittsburgh, PA
• Patent Number(s): US 4681737
• OSTI ID: 6184784
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
ACETIC ACID
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BOILERS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL COMPOSITION
CITRIC ACID
CORROSION INHIBITORS
CORROSION RESISTANCE
DISPERSIONS
ELEMENTS
FEEDWATER
HYDROGEN COMPOUNDS
HYDROXY ACIDS
MIXTURES
MONOCARBOXYLIC ACIDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
QUANTITY RATIO
SODIUM COMPOUNDS
SOLUTIONS
STABILIZATION
WATER