Product Identification

Product Name

Citraconic acid

Synonyms

(Z)-2-Methylbut-2-enedioic acid
2-Butenedioic acid, 2-methyl-
Methylmaleic acid

CAS

498-23-7

Formula

C5H6O4

Molecular Weight

130.1

EINECS

207-858-7

RTECS

GE6650000

RTECS Class

Other

Merck

13,2345

Beilstein/Gmelin

1722679

Beilstein Reference

4-02-00-02230

Physical and Chemical Properties

Appearance

Hygroscopic, off-white powder.

Solubility in water

Very soluble

Melting Point

98 - 99

Boiling Point

336

Vapor Pressure

2E-5 (25 C)

Density

1.617 g/cm3

pKa/pKb

3.44 (pKa)

Partition Coefficient

.54

Heat Of Vaporization

63.7 kJ/mol

Heat Of Combustion

-2008 kJ/mol

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.

Hazards Identification

Ingestion

May cause irritation of the digestive tract. May be harmful if swallowed.

Inhalation

May cause respiratory tract irritation.

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

Hazards

During a fire, irritating and highly toxic gasesmay be generated by thermal decomposition or combustion.

EC Risk Phrase

R 22

EC Safety Phrase

S 22 36/37

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Fire Fighting Measures

Flash Point

172

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Runoff from fire control or dilution water may cause pollution. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Upper exp. limit

14.6

Lower exp. limit

2.1

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Incompatibilities

Oxidizing agents, reducing agents, bases, moisture.

Stability

Stable under normal temperatures and pressures.

Decomposition

Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.