DL-Lactic acid

  • 2-Hydroxypropanoic acid
  • 2-Hydroxypropionic acid
  • Milk acid
  • Tonsillosan
  • Biolac
  • Chem-Cast
Formula
C3H6O3
Structure
Description
Clear, colorless liquid with an acrid odor.
Uses
Substance is used in dyeing baths, as mordant in printing woolen goods, solvent for water-insoluble dyes (alcohol-soluble induline, nigrosine, spirit-blue).

Registry Numbers and Inventories.
CAS
598-82-3
EC (EINECS/ELINCS)
209-954-4
UN (DOT)
3265
Merck
12,5349
Beilstein/Gmelin
1209341
Beilstein Reference
4-03-00-00633
Canada DSL/NDSL
DSL
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H6O3
Formula mass
90.08
Melting point, °C
16.8
Boiling point, °C
122
Vapor pressure, mmHg
0.015 (25 C)
Density
1.357 g/cm3
Solubility in water
Very soluble
Refractive index
1.43915 (20 C)
pKa/pKb
3.90 (pKa)
Partition coefficient, pKow
-0.62
Heat of vaporization
54.0 kJ/mol
Heat of combustion
-1363 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
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.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Do not get water inside containers.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bases - oxidizing agents - nitric acid - albumin - mixture with nitric acid + hydrofluoric acid may react vigorously.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
98
Upper exp. limit, %
18
Lower exp. limit, %
3.1
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Do NOT get water inside containers. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
 
Special
O

Health.
Exposure effects
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation. Causes sore throat, coughing, shortness of breath, and dental corrosion. Inhalation of vapors will cause coughing or breathing difficulty.
   Skin
Causes skin burns.
   Eyes
Causes eye burns. Contact may cause ulceration of the conjunctiva and cornea.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
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.

Transport.
UN number
3265
Response guide
Hazard class
8
Packing Group
I; II; III
 
4. Organic acids