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Dimethyl terephthalate

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Dimethyl terephthalate Basic information

Product Name:
Dimethyl terephthalate
CAS:
120-61-6
MF:
C10H10O4
MW:
194.18
EINECS:
204-411-8
Mol File:
120-61-6.mol
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Dimethyl terephthalate Chemical Properties

Melting point:
140 °C
Boiling point:
288 °C
Density 
1,29 g/cm3
vapor density 
1.04 (vs air)
vapor pressure 
1.15 mm Hg ( 93 °C)
refractive index 
1.4752
Flash point:
154 °C
storage temp. 
Store below +30°C.
solubility 
water: slightly soluble0.0493g/L at 20°C
form 
Flakes or Pellets
color 
White
explosive limit
0.8-11.8%(V)
Water Solubility 
It is slightly soluble in water but soluble in hot alcohol and ether.
Merck 
14,9162
BRN 
1107185
Stability:
Stable. Incompatible with strong acids, strong bases, strong oxidizing agents.
CAS DataBase Reference
120-61-6(CAS DataBase Reference)
EPA Substance Registry System
Dimethyl terephthalate (120-61-6)
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Safety Information

Risk Statements 
36/37/38
Safety Statements 
24/25
RIDADR 
3256
WGK Germany 
1
RTECS 
WZ1225000
Autoignition Temperature
520 °C DIN 51794
TSCA 
Yes
HS Code 
2917 37 00
Toxicity
LD50 orally in Rabbit: 3200 mg/kg

MSDS

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Dimethyl terephthalate Usage And Synthesis

Description

Dimethyl terephthalate (DMT) is an organic compound with the formula C6H4(CO2CH3)2. It is the diester formed from terephthalic acid and methanol. It is a white solid that melts to give a distillable colourless liquid.

Chemical Properties

white chunks

Chemical Properties

The empirical formula of dimethyl terephthalate (DMT) is C10H10O4. Its structural formula is 1,4-(COOCH3)2C6H4. At room temperature, exists as colorless crystals. DMT is soluble in ether and chloroform, slightly soluble in ethanol, and fairly insoluble in water (<1 g/L at 13℃).

Uses

DMT is used in the production of polyesters, including polyethylene terephthalate (PET) and poly trimethylene terephthalate. It consists of benzene substituted with carboxy methyl groups (CO2CH3) at the 1 and 4 positions. Because DMT is volatile, it is an intermediate in some schemes for the recyclic of PET, e.g. from plastic bottles.
Hydrogenation of DMT affords the diol cyclo hexane dimethanol , which is a useful monomer.

Uses

Dimethyl terephthalate (DMT) is used in the production of polyesters, including polyethylene terephthalate (PET) and poly trimethylene terephthalate. It consists of benzene substituted with carboxy methyl groups (CO2CH3) at the 1 and 4 positions. Because DMT is volatile, it is an intermediate in some schemes for the recyclic of PET, e.g. from plastic bottles.
Hydrogenation of DMT affords the diol cyclohexanedimethanol, which is a useful monomer.

Production Methods

Dimethyl terephthalate (DMT) has been produced in a number of ways. Conventionally and still of commercial value is the direct esterification of terephthalic acid. Alternatively, it can be prepared by alternating oxidation and methyl-esterification steps from p-xylene via methyl-p-toluate.

General Description

White solid or heated colorless liquid. Has no odor. Liquid solidifies in cool water. Solid and liquid sink in water.

Air & Water Reactions

When mixed with air, the vapor or dust forms very hazardous and highly reactive mixtures. . Insoluble in water.

Reactivity Profile

DIMETHYL TEREPHTHALATE is an ester. Esters react 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 of esters with caustic solutions. Flammable hydrogen is generated by mixing esters with alkali metals and hydrides. Can generate electrostatic charges. [Handling Chemicals Safely 1980. p. 250]. DIMETHYL TEREPHTHALATE is sensitive to heat. The molten material reacts with water due to the temperature. DIMETHYL TEREPHTHALATE is incompatible with strong oxidizers, strong acids and strong bases.

Health Hazard

Molten DMT will cause severe burns of skin on contact.

Fire Hazard

DIMETHYL TEREPHTHALATE is combustible.

Safety Profile

Moderately toxic by intraperitoneal route. Mdly toxic by ingestion. An eye irritant. Mutation data reported. When heated to decomposition it emits acrid smoke and irritating fumes

Carcinogenicity

In a study conducted by the NCI, DMT was not considered to be carcinogenic in rats or mice ingesting 2500 or 5000 ppm in the diet for 103 weeks.

Purification Methods

Purify it by recrystallisation from aqueous EtOH, MeOH or CCl4; or by zone melting. [Beilstein 6 H 843, 6 III 4250, 6 IV 3303.] .

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Dimethyl terephthalateSupplierMore

Nanjing Lanbai Chemical Co., Ltd. Gold
Tel:
+86 (25) 8549-9326,8549-9316,15366059326 13813836665
Email:
lanbaichem@163.com
Shanghai YouPeng Chemical Co. Ltd. Gold
Tel:
021-69002118- ;021-69002118-
Email:
13701776567@163.com;13701776567@163.com
Creasyn Finechem(Tianjin) Co., Ltd.
Tel:
022-83945878-
Email:
export@creasyn.com
J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Email:
sh@meryer.com
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