Hydrogen Fluoride (HF)
What is Hydrogen Fluoride?
Hydrogen fluoride (HF) is a highly corrosive and dangerous chemical even at low concentrations as a colorless gas or as a fuming liquid when dissolved in water, known as hydrofluoric acid.
Refinery Explosion Releases HF
In a refinery-related spill, HF used in alkylation is accidentally released during transfer. A vapor cloud forms and comes into contact with a worker's unprotected face and arms.
It has a sharp, irritating odor and can cause severe injury even at low concentrations, and is is commonly used in oil and gas operations, including well acidizing to dissolve rock formations and improve production. It is also used in refinery processes, such as alkylation, to produce high-octane fuels.
Exposure to hydrogen fluoride can occur during equipment failures, leaks, spills, or chemical transfer operations. Large accidental releases have occurred during refinery incidents, including explosions, where hydrogen fluoride was released into the surrounding environment.
Health Risks
Because hydrogen fluoride is extremely corrosive, it can damage metal, concrete, and protective equipment. It can also travel as a vapor cloud, creating serious risks for workers and nearby communities.
- Skin or eye contact can cause deep tissue burns.
- Inhalation may lead to severe lung irritation and pulmonary edema.
- Systemic poisoning can occur as fluoride ions enter the bloodstream.
- Chronic exposure may cause skeletal fluorosis.
Occupational Exposure Limits
Strict handling procedures, proper personal protective equipment (PPE), and emergency response planning are critical when working in areas where hydrogen fluoride is used or stored.
- NIOSH REL: TWA 3 ppm; ceiling 6 ppm for 15 minutes.
- OSHA PEL: TWA 3 ppm.
Knowledge Check Choose the best answer for the question.
4-8. Why is hydrogen fluoride considered especially dangerous at low concentrations?
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