Blog

Fire Fighting Emergency Rescue For HPEG Production Accidents

Methylallyl polyoxyethylene ether (HPEG) is a key raw material for polycarboxylate superplasticizers. Its production involves highly flammable and explosive chemicals, including ethylene oxide (EO), isobutylene, and methallyl alcohol. HPEG production facilities present unique fire hazards and high explosion risks, requiring specialized emergency rescue tactics.

This article summarizes the fire risk characteristics of HPEG production and provides professional emergency response guidelines for firefighters and safety officers.

What Is HPEG & Why Is It Dangerous?

1.Superplasticizers in Concrete

HPEG (Methylallyl polyoxyethylene ether) is a core polyether monomer for high-performance polycarboxylate water reducers.
The production process includes:

Methallyl alcohol synthesis (oxidation of isobutylene).
Ethoxylation reaction with ethylene oxide (EO).
Maturation, vacuum degassing, neutralization, and packaging.

Hazardous materials involved:

Ethylene oxide (EO): explosion limit 3.0%–100%, equivalent to TNT explosion energy.
Isobutylene: highly flammable, easy to polymerize, and can explode.
Methallyl alcohol: flammable, requires heat preservation.
Glacial acetic acid: corrosive, flammable.

Fire Hazards in HPEG Production

Raw Material & Storage Tank Areas

Ethylene oxide tank: ultra-high explosion risk, requires nitrogen sealing.
Isobutylene tank: flammable gas, easy to form explosive mixtures.
Methallyl alcohol storage: solidifies below 50°C, may crack tanks.
Narrow tank spacing, strong radiation heat, and it is easy to cause a chain explosion.
Tall and thin tanks make foam coverage difficult.

Production Process Risks

Must maintain oxygen content <0.5% to prevent explosion.
Ethoxylation and maturation under pressure and temperature control.
Vacuum degassing failure may cause runaway polymerization.
DCS/SIS safety system failure leads to over-temperature & over-pressure.
Once exploded, it forms a 3D factory fire + flowing fire.

Key Emergency Rescue For HPEG Production Accidents

On-Site Judgment & Information Collection

Confirm materials: EO, isobutylene, methallyl alcohol, and glacial acetic acid.
Check process status: reaction, maturation, degassing.
Obtain data from DCS control room: temperature, pressure, oxygen level.
Evacuate and set up a wide safety perimeter.

Fire Fighting for Tank Areas

Ethylene Oxide Tank Fire

Use nitrogen inerting & smothering first.
Cool adjacent tanks with large water flow.
Use fire-fighting robots and mobile monitors.
Avoid direct water injection to prevent boiling liquid expansion.

Isobutylene & Methallyl Alcohol Tanks

Nitrogen seal protection
Anti-soluble foam application
Keep the temperature above the melting point to avoid tank cracking.

Glacial Acetic Acid Leakage

Neutralize with lime or baking soda.
Water curtain dilution.
Dike and collect wastewater to prevent pollution.

Reactor & Production Device Rescue

Emergency shutdown, cut off feed.
Nitrogen filling for inerting and extinguishing.
Adjust pressure to positive pressure and avoid inhaling air.
Use elevated spray vehicles for long-distance cooling.
Strictly avoid blind internal attack.

Personal Safety Protection

Full chemical protective clothing.
SCBA (self-contained breathing apparatus).
Multiple teams for rotation.
Stay away from pressure relief surfaces and tank heads.

Core Safety Rules for HPEG Fire Rescue

Ethylene oxide accidents: priority is nitrogen inerting, not water
Keep methallyl alcohol warm to prevent solidification and tank rupture.
Use anti-soluble foam for polar solvent fires.
Use remote monitors & robots to reduce on-site personnel.
Strictly control oxygen content to prevent secondary polymerization explosion.

Conclusion

HPEG production is a typical fine chemical process with ultra-high fire and explosion risks, especially due to ethylene oxide. Effective rescue must rely on: