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131-11-3

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Identification

Name
Dimethyl phthalate
CAS
131-11-3
Synonyms
1,2-Benzenedicarboxylic acid dimethyl ester
AVOLIN(R)
DIMETHYL 1,2-BENZENDICARBOXYLATE
DIMETHYL 1,2-BENZENEDICARBOXYLATE
Dimethyl-o-phthalate
DIMETHYL PHTHALATE
DMP
DMP(R)
FERMINE
METHYL PHTHALATE
MIPAX
MIPAX(R)
PALATINOL M
PALATINOL M(R)
PHTHALIC ACID, BIS-METHYL ESTER
PHTHALIC ACID DIMETHYL ESTER
1,2-benzendicarboxylicacid,dimethylester
1,2-dimethyl phthalate
ai3-00262
Avolin
EINECS(EC#)
205-011-6
Molecular Formula
C10H10O4
MDL Number
MFCD00008425
Molecular Weight
194.18
MOL File
131-11-3.mol

Chemical Properties

Appearance
colourless oily liquid
Melting point 
2 °C(lit.)

mp 
2 °C(lit.)

Boiling point 
282 °C(lit.)

bp 
282 °C(lit.)

density 
1.19 g/mL at 25 °C(lit.)

refractive index 
n20/D 1.515(lit.)

Fp 
295 °F

storage temp. 
2-8°C
solubility 
4.0g/l
form 
Liquid
color 
Clear
PH
7 (H2O, 20℃)
Relative polarity
0.309
Stability:
Stable. Combustible. Incompatible with strong oxidizing agents, strong acids, strong bases, nitrates. Sensitive to prolonged exposure to light.
Water Solubility 
<0.1 g/100 mL at 20 ºC
Merck 
14,3255
BRN 
1911460
InChIKey
NIQCNGHVCWTJSM-UHFFFAOYSA-N
Contact allergens
Phthalates are plasticizers and increase the flexibility of plastics. They are also found in deodorant formulations, perfumes, emollients, and insect repellents.
Uses
Dimethyl phthalate is used as an insect repellant. It has also been employed as a solvent for cellulose acetate.
CAS DataBase Reference
131-11-3(CAS DataBase Reference)
NIST Chemistry Reference
Dimethyl phthalate(131-11-3)
EPA Substance Registry System
131-11-3(EPA Substance)

Safety Data

Hazard Codes 
F,T
Risk Statements 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed .
R36/37/38:Irritating to eyes, respiratory system and skin .
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
R11:Highly Flammable.
Safety Statements 
S24/25:Avoid contact with skin and eyes .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37:Wear suitable protective clothing and gloves .
S16:Keep away from sources of ignition-No smoking .
S7:Keep container tightly closed .
RIDADR 
UN 3082
WGK Germany 
1

RTECS 
TI1575000

TSCA 
Yes
HS Code 
29173490
Safety Profile
Moderately toxic by ingestion and intraperitoneal routes. Mldly toxic by inhalation. Experimental teratogenic and reproductive effects. Mutation data reported. An eye irritant. A pesticide and insect repellent. Combustible when exposed to heat or flame; can react with oxidizing materials. To fight fire, use CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. See also ESTERS.
Hazardous Substances Data
131-11-3(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
A water-white liquid without significant odor. Denser than water and insoluble in water. Hence sinks in water. Flash point 300°F. Eye contact may produce severe irritation and direct skin contact may produce mild irritation. Used in the manufacture of a variety of products including plastics, insect repellents, safety glass, and lacquer coatings.
Reactivity Profile
DIMETHYL PHTHALATE(131-11-3) reacts with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction with caustic solutions. Flammable hydrogen is generated by mixing with alkali metals and hydrides. Can generate electrostatic charges by swirling or pouring [Handling Chemicals Safely, 1980. p. 250].
Air & Water Reactions
Insoluble in water.
Health Hazard
Symptoms unlikely from any exposure.
Fire Hazard
This chemical is combustible.

Material Safety Data Sheet(MSDS)

Questions And Answer

Dimethyl phthalate
Dimethyl phthalate esters is a broad-spectrum, highly effective insect repellent, it is colorless to pale yellow transparent liquid, is an effective insect repellent ingredient in toilet water, it has a good repellent effect on flies, lice, ants, mosquitoes, cockroaches, midges, gadfly, flat fleas, sand fleas, sand midges, sandflies, cicadas; its repellent effect lasts for a long time, and it can be used in different climatic conditions . Under the conditions of using, it’s chemical stable, displaying both high thermal stability and high resistance to sweat. It has good compatibility with common cosmetic and pharmaceutical agents, can be made of solutions, emulsions, pastes, coating agents, gel, aerosol, mosquito coils, micro-capsules and other special repellent agents, and also can be added to other products or materials (such as toilet water), so that product displays the repellent effect as well. Compared with standard mosquito repellent agent and mosquito repellent gel, it is less toxic, and less irritating, with longer repellent time and other notable features, is a repellent gel replacement.
The above information is edited by the chemicalbook of Tian Ye.
Toxicity
Dimethyl phthalate displays no toxicity or side effects on the skin and mucous membranes, non-allergic and non-skin-permeable etc., it is very safe to use, it is noted that people with sensitive skin may cause skin allergies reaction if repellent ester component is excessive absorbed .
Chemical Properties
Colorless oily liquid with a slightly aromatic fragrance. Immiscibility with ethanol, ethyl ether , soluble in organic solvents such as benzene, acetone, insoluble in water and mineral oil.
Uses
1. It is used as a plasticizer for cellulose acetate, polyvinyl fluoride coating repellent agents and solvents.
2. Dimethyl Phthalate is rodenticide rat poison, rat finished, chlorine mouse ketone intermediates, it is also an important solvent.
3. The product is a plasticizer for variety of resin having a very strong dissolving power, is compatible with a variety of cellulose resin, rubber, vinyl resin. It displays good film-forming character, adhesion and water resistance. It is usually used with diethyl phthalate in cellulose acetate film, varnish, transparent paper and molding powder production . A small amount of the product is used in nitrocellulose production. The product can also be used as a nitrile rubber plasticizers, with good resistance to cold products. The product can be mixed with other plasticizers. It can overcome the high volatility , low-temperature crystallization and other shortcomings. The products are also used as DEET oil (crude oil) and DDT solvents. The product is also used as gas chromatography stationary phase.
Production method
Esterified under normal pressure with an excess amount of the anhydride (4-fold) in methanol, excess methanol was refluxed with water, DMP was obtained from the reaction. The 600kg anhydride, 450kg methanol 90-95 ℃', 1050ml concentrated sulfuric acid were added into the reaction pot successively, heated to reflux for 24h. After completion of the reaction, methanol recovery, then neutralized with sodium carbonate, washed with water, and then distilled to obtain the finished product. Industrial grade product dimethyl phthalate purity of ≥99%. Material consumption fixed: anhydride 750kg/t, methanol 445kg/t.
Category
Flammable liquid
Toxicity grading
Low toxicity
Acute toxicity
Oral-rat LD50: 6800 mg/kg; Oral-Mouse LD50: 6800 mg/kg
Irritation data
Eye-rabbit 119 mg
Flammability hazard characteristics
In the case of fire, high temperature, strong oxidants, it is combustible; combustion exhaust irritating smoke.
Storage feature
It should be stored in a complete package with care; warehouse ventilation, away from obvious flame, heat, and oxidants.
Extinguishing agents
Foam, carbon dioxide, dry powder, sand, water mist.
Professional Standards
TLV-TWA 5 mg/m³; STEL 10 mg/m3

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