Formic Acid (Methanoic Acid)

Overview

Formic Acid (CAS No: 64-18-6), also known as methanoic acid, is a strong, colorless organic acid with a pungent odor. It is the simplest carboxylic acid and is naturally found in ants and some plants. Industrially synthesized formic acid is widely used in various sectors.

Formic acid has unique chemical properties, as it can act both as an acid and an aldehyde. This characteristic makes it valuable in various chemical reactions and industrial applications. It is miscible with water, alcohol, and ether.

Uses

Formic Acid has a wide range of industrial applications:

Technical Specifications

Safety Information

Hazard Symbols and Indications

Corrosive Flammable Health Hazard

Personal Protective Equipment (PPE)

• Acid-resistant gloves (neoprene or nitrile)
• Chemical safety goggles or face shield
• Respiratory protection against acid vapors
• Acid-resistant apron or workwear
• Chemical-resistant shoes

Storage Conditions

• Store in a cool, well-ventilated, corrosion-resistant area
• Use containers made of stainless steel, polyethylene, or glass
• Storage temperature: 15–25°C
• Keep away from oxidants and bases
• Protect from direct sunlight

Firefighting Measures

• Suitable extinguishers: Dry chemical, CO₂, alcohol-resistant foam
• Use of water: Only as mist; avoid large amounts of water
• Intervene with trained personnel and appropriate respiratory protection
• Combustion products may be toxic (carbon monoxide, formic acid vapors)

Transport and Storage

Transport

• Ensure containers are tightly sealed
• Avoid eating, drinking, or smoking during transport
• Provide adequate ventilation in transport vehicles
• Keep neutralizing material available for spills
• Ground to prevent static electricity buildup

Storage

• Store in stainless steel, polyethylene, or glass containers
• Place appropriate signage in the storage area
• Use suitable breather valves on storage tanks
• Provide secondary containment for large quantities
• Keep acid-neutralizing material in the storage area

Spill Response Measures

• Evacuate personnel from the affected area
• Use appropriate personal protective equipment
• Contain the spill with sand, sodium bicarbonate, or other neutralizing materials
• Dispose of absorbed material properly
• Wash the affected area with plenty of water

Regulatory Information

GHS Classification

• Corrosive/Caustic Category 1B
• Flammable Liquid Category 3
• Acute Toxicity (Oral) Category 3
• Acute Toxicity (Dermal) Category 3
• Skin Irritation/Corrosion Category 1
• Eye Damage/Corrosion Category 1

Key Regulations

• REACH: Registered
• CLP: Compliant
• OSHA: Subject to hazard communication standard
• NFPA 704: Health 3, Flammability 2, Reactivity 0

International Regulations

• European Union: Subject to Directive 2008/58/EC
• USA: Listed on EPA TSCA
• China: Listed on IECSC
• Japan: Listed on ISHL

Environmental Information

Environmental Impact

Formic acid has moderate toxicity in aquatic environments and is biodegradable. At high concentrations, it may be harmful to aquatic life. It exhibits high mobility in soil and may contaminate groundwater. In the atmosphere, it degrades rapidly through photochemical reactions.

Biodegradation

• Air: Half-life of 1–3 days via photochemical reactions
• Water: Decomposes in 7–14 days through microbial activity
• Soil: Biodegradation in 2–4 weeks through microbial activity

Waste Management

• Classified as hazardous waste
• Must be neutralized and disposed of in authorized hazardous waste facilities
• Do not discharge into sewers or surface waters
• Dispose of in accordance with local regulations

Frequently Asked Questions

How is formic acid produced?

Formic acid is industrially produced primarily through methanol carbonylation and hydrolysis, using sodium methoxide as a catalyst. Alternatively, it can be produced via acidic hydrolysis of formamide or acidification of sodium formate.

What is the difference between formic acid and acetic acid?

Formic acid (CH₂O₂) is the simplest carboxylic acid and exhibits both acid and aldehyde properties. Acetic acid (CH₃COOH) is a larger molecule with a higher boiling point. Formic acid is stronger and more corrosive than acetic acid.

What are the benefits of using formic acid in animal feed?

Formic acid lowers the pH in silage, preventing the growth of harmful bacteria and mold. It also preserves nutritional value and extends the shelf life of feed. As a natural preservative, it reduces the use of antibiotics.

What is the role of formic acid in leather processing?

Formic acid facilitates the penetration of chrome salts into leather during tanning, achieving more uniform tanning. It also acts as a pH regulator and reduces processing time.

What should I do if formic acid comes into contact with skin?

Immediately remove contaminated clothing and wash the skin with plenty of water and soap for at least 15 minutes. If burns or irritation persist, seek medical attention. In case of eye contact, rinse with plenty of water for at least 15 minutes and seek medical attention immediately.