Condensate Amines

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

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

Dose to a target condensate pH — typically pH 8.3 to 9.0 for all-ferrous systems — and verify with field pH and iron testing, not by amine feed rate alone. Where steam contacts food or food-contact surfaces, US FDA 21 CFR 173.310 limits which boiler-water additives are permitted and at what levels; cyclohexylamine, morpholine, and DEAE all appear there with concentration 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 — PubChem
• Morpholine — PubChem
• DEAE (N,N-diethylethanolamine) — PubChem