2,2-Dichloropropionic acid

  • Dalapon
  • 2,2-Dichloropropanoic acid
Formula
C3H4Cl2O2
Structure
Description
A colorless liquid.
Uses
Herbicide.

Registry Numbers and Inventories.
CAS
75-99-0
EC (EINECS/ELINCS)
200-923-0
EC Index Number
607-162-00-7
EC Class
Harmful; Irritant; Dangerous for the Environment
R 22 38 41 52/53
S 26 39 61
RTECS
UF0690000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
UN (DOT)
1760
Merck
13,2830
Beilstein/Gmelin
1750149
Beilstein Reference
4-02-00-00753
EPA OPP
28901
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C3H4Cl2O2
Formula mass
142.97
Melting point, °C
7.8
Boiling point, °C
202
Vapor pressure, mmHg
5
Vapor density (air=1)
1.4014
Odor Threshold Odor threshold 2,500 mg/m3
Density
1.361 g/cm3 (20 C)
Solubility in water
Slightly soluble
Refractive index
1.4532 (20 C)
pKa/pKb
1.53 (pKa)
Partition coefficient, pKow
0.778

Hazards and Protection.
Storage
Keep in well ventilated area.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Neutralize spilled material with crushed limestone, soda ash, or lime. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Water spill: Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Remove trapped material with suction hoses. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Stable in dry form.
Incompatibilities
Reacts in this way with all bases, both organic (for example, the amines) and inorganic Can react with active metals to form gaseous hydrogen and a metal salt Flammable and/or toxic gases and heat are generated by the reaction with with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides.

Fire.
Flash Point,°C
>110
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use water spray to knock-down vapors.
Fire potential
This material is combustible.
Hazards
Irritating fumes of hydrochloric acid may form in fire. Volatilizes with steam.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH REL: TWA 1 ppm (6 mg/m3)
Exposure effects
CNS excitation, seizures, tremor, ataxia, agitation, nervousness, and amnesia may occur. Kelthane, perthane, methoxychlor, and hexachlorobenzene have little CNS toxicity; in extreme overdose CNS depression may occur. Organochlorine pesticides such as DDT pass through the placenta, with an average level in the newborn blood reaching around a third of that in maternal blood. They can also be found in breast milk. Excessive absorption of kepone (chlordecone) has depressed sperm counts and sperm motility in exposed workers.
   Ingestion
Nausea, vomiting, and diarrhea may follow ingestion.
   Inhalation
Aspiration of insecticide containing petroleum distillate may result in pneumonitis.
   Skin
Extensive contact results in dermal irritation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method 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. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing. Wash skin and hair thoroughly; do two soap and water washings. Leather absorbs pesticides. Hence, leather should not be worn in the presence of pesticides and all contaminated leather should be discarded.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
1760
Response guide
Hazard class
8
Packing Group
I; II; III
 
USCG CHRIS Code
DLP
 
Std. Transport #
4931455
 
IMO Pollution Category
D
IMO Hazard code
S