Product Identification

Product Name

2-Propynoic acid

Synonyms

2-Propyne-1-carboxylic acid
2-Propynoic acid
Acetylenecarboxylic acid
Acetylenemonocarboxylic acid
Carboxyacetylene
Propiolic acid

CAS

471-25-0

Formula

C3H2O2

Molecular Weight

70.05

EINECS

207-437-8

RTECS

UD9300000

RTECS Class

Other

Merck

12,8006

Beilstein/Gmelin

878176

Beilstein Reference

4-02-00-01687

EC Class

toxic, corrosive

Physical and Chemical Properties

Appearance

Clear yellow to orange liquid. Acetic odor.

Solubility in water

Very soluble

Melting Point

18

Boiling Point

140

Vapor Pressure

3.7 (25 C0

Density

1.1499 g/cm3 (4 C)

pKa/pKb

1.99 (pKa)

Partition Coefficient

0.31 kJ/mol

Heat Of Vaporization

41.6 kJ/mol

Vapor Density

2.42

Refractive Index

1.4302 (20 C)

First Aid Measures

Ingestion

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

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. Do not use mouth-to-mouth respiration if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device.

Skin

Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Eyes

Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed.

Handling and Storage

Storage

Keep away from heat, sparks, and flame. Keep away from sources of ignition. Flammables-area. Refrigerator (approx 4 C). Keep containers tightly closed. Store protected from moisture.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Use only in a chemical fume hood. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Ingestion

Harmful if swallowed. May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Ingestion of large amounts may cause CNS depression.

Inhalation

May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. Vapors may cause dizziness or suffocation. May cause burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting.

Skin

May cause severe irritation and possible burns. May cause dermatitis. Substance is readily absorbed through the slkin. May cause cyanosis of the extremities.

Eyes

Contact with eyes may cause severe irritation, and possible eye burns. Lachrymator. May cause chemical conjunctivitis and corneal damage.

Hazards

Contact with metals may evolve flammable hydrogen gas.

EC Risk Phrase

R 24/25 34 36/37

EC Safety Phrase

S 26 36/37/39 45

UN (DOT)

1760

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear safety glasses and chemical goggles if splashing is possible. Skin: Wear appropriate protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.

Fire Fighting Measures

Flash Point

58

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. Will burn if involved in a fire. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. Do NOT use straight streams of water.

Fire Potential

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Accidental Release Measures

Small spills/leaks

Remove all sources of ignition. Absorb spill using an absorbent, non-combustible material such as earth, sand, or vermiculite. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.

Stability and Reactivity

Incompatibilities

Moisture, bases, oxidizing agents, reducing agents, copper (I) + ammonia, silver salts + ammonia.

Stability

Stable under normal temperatures and pressures.

Decomposition

Carbon monoxide, carbon dioxide, acrid smoke and fumes.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

1760

Hazard Class

8

Packing Group

I; II; III

HS Code

2916 19 80