Organic Acids
REACH
Crotonic acid
CAS Number
3724-65-0
EC Number
223-077-4
FEMA Number
FEMA 3908
What is Crotonic acid?
Crotonic acid (CAS 3724-65-0), also known as beta-methylacrylic acid, is an unsaturated monocarboxylic acid used primarily as a reactive monomer and chemical intermediate.
Where is Crotonic acid used?
- Polymer chemistry: copolymerized with vinyl acetate to produce hair-fixative resins for aerosol sprays and styling formulations
- Resins and coatings: functional building block for synthesizing copolymers with targeted performance characteristics
- Agricultural chemicals: intermediate in synthesizing crop protection actives and adjuvant systems
- Pharmaceuticals: synthetic intermediate for active pharmaceutical ingredient (API) manufacturing
- In food and flavor applications it functions as a flavoring agent and acidulant in approved formulations.
Commercial specifications
- Purity levels typically ranging from 99% upward for high-specification applications
- Packaging in small drums through to bulk quantities
Other Names (Synonyms)
beta-methylacrylic acid|beta-methacrylic acid|alpha-crotonic acid|alpha-butenoic acid|3-methylacrylic acid|2-butenic acid|CTA|(E)-but-2-enoic acid
What are the physical properties of Crotonic acid?
Melting Point 72 °C
Boiling Point 185 °C
Density 1.018 g/cm³ @ Temp: 15 °C
Flash Point 190 °F
Appearance Crotonic acid is a white or colorless, crystalline solid with a pungent odor. May be transported as a molten liquid.
Odor at 0.10 % in propylene glycol. roasted burnt
Water Solubility soluble
Vapor Pressure 0.19 mm Hg ( 20 °C)
Refractive Index 1.4210 (estimate)
Log P 0.720
How is Crotonic acid classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS07· Irritant GHS06· Toxic
Hazard Statements
H302 Harmful if swallowed
H311 Toxic in contact with skin
H312 Harmful in contact with skin
H314 Causes severe skin burns and eye damage
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P262 Do not get in eyes, on skin, or on clothing.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to Crotonic acid?
UN Number 2823
ADR Class 8
Packing Group III
Storage Class 8A - Combustible corrosive hazardous materials
WGK (Germany) 3