Condensate Amines

Condensate amines are volatile, basic amines dosed into steam to protect condensatenreturn lines from acidic corrosion. As steam carries dissolved carbon dioxide forward,nthe CO2 dissolves in condensing water to form carbonic acid, which drops pH and corrodes ironnpiping. Neutralizing amines raise condensate pH; the choice among them turns on how far eachntravels through the system before it condenses. Match the amine's distribution ratio to thenlayout of your condensate network.

The page carries three neutralizing amines, with a real trade-off between reach and dosenefficiency. Cyclohexylamine has a high distribution ratio u2014 it volatilizes readily and protectsnfar, low-pressure ends of long return systems, but partitions less into early condensate.nMorpholine has a low distribution ratio and protects high-pressure, near-boiler condensatenfirst. DEAE sits between the two. Blend by distribution ratio to hold a uniform pH across thenwhole system rather than relying on one amine everywhere.

Dose to a target condensate pH u2014 typically pH 8.3 to 9.0 for all-ferrous systems u2014 andnverify with field pH and iron testing, not by amine feed rate alone. Where steam contacts foodnor food-contact surfaces, US FDA 21 CFR 173.310 limits which boiler-water additives arenpermitted and at what levels; cyclohexylamine, morpholine, and DEAE all appear there withnconcentration limits. Confirm regulatory status for your application and jurisdiction.

• Neutralizing carbonic-acid (CO2) corrosion in steam condensate return lines
• Raising and holding condensate pH across low- and high-pressure return networks
• Protecting boiler feedwater and condensate piping in industrial steam systems
• Multi-amine blending to cover both near-boiler and remote condensate
• Steam systems in food and beverage plants (subject to FDA boiler-additive limits)

• Cyclohexylamine u2014 PubChem
• Morpholine u2014 PubChem
• DEAE (N,N-diethylethanolamine) u2014 PubChem