Oxygen scavenger/metal passivator reduces corrosion, toxicity
Haverhill Paper board, a Haverhill, MA manufacturer of recycled paperboard, generates about 120,000 lb/hr of 650 psi, 650/sup 0/F (superheated) steam. Boiler deposition and condensate return corrosion problems were always high on the list of things to avoid. A water treatment firm provided the solution with a recently developed oxygen scavenger. The new scavenger, a Chemical Processing Vaaler Award winner (Mid-November, 1986, p. 130), is a patented formulation containing methyl ethyl ketoxime (MEKO). The formulation is designed to provide protection comparable to hydrazine but without the toxicity concerns. Used in conjunction with the mechanical deaerator, MEKO scavenges the remaining 5-7 ppb of oxygen from the feed water, producing methyl ethyl ketone (MEK), N/sub 2/O, and water. High volatility gives it the ability to leave the boiler with the steam, protecting the entire generating system. MEKO also acts as a metal surface passivator, protecting iron surfaces from corrosion by forming passivated oxide films. In use since December, 1985, the MEKO-based oxygen scavenger has coupled with the other chemical and mechanical water treatment methods to maintain the boiler in operating condition. The MEKO is performing as well or better than the hydrazine at about the same cost - while avoiding the toxicity problem.
- OSTI ID:
- 5923988
- Journal Information:
- Chem. Process. (Chicago); (United States), Journal Name: Chem. Process. (Chicago); (United States); ISSN CHPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMINES
BOILERS
CHEMICAL PLANTS
CHEMICAL REACTIONS
CONDENSATES
CORROSION
CORROSION INHIBITORS
CORROSIVE EFFECTS
ELEMENTS
FEEDWATER
HYDRAZINE
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
IRON
KETONES
MAINTENANCE
METALS
NITROGEN COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIMES
OXYGEN
OXYGEN COMPOUNDS
PERFORMANCE
POLLUTION ABATEMENT
REMOVAL
TRANSITION ELEMENTS
WATER
WATER POLLUTION ABATEMENT
WATER TREATMENT