ChemicalBook CAS DataBase List 89-32-7

89-32-7

Name	1,2,4,5-Benzenetetracarboxylic anhydride
CAS	89-32-7
EINECS(EC#)	201-898-9
Molecular Formula	C10H4O7
MDL Number	MFCD00005005
Molecular Weight	236.13
MOL File	89-32-7.mol

Synonyms

1,2,4,5-BENZENETETRACARBOXYLIC ANHYDRIDE 1,2,4,5-BENZENETETRACARBOXYLIC DIANHYDRIDE BENZENE-1,2,4,5-TETRACARBOXYLIC 1,2,4,5-DIANHYDRIDE BENZENE-1,2,4,5-TETRACARBOXYLIC DIANHYDRIDE PMDA PYROMELLITIC DIANHYDRIDE TIMTEC-BB SBB008218 1,2,4,5-Benzenetetracarboxylic 1,2:4,5-dianhydride 1,2,4,5benzenetetracarboxylic1,2:4,5dianhydride 1,2,4,5-benzenetetracarboxylic1,2:4,5-dianhydride 1,2,4,5-Benzenetetracrboxylicdianhydride 1h,3h-benzo(1,2-c:4,5-c’)difuran-1,3,5,7-tetrone 1H,3H-Benzo[1,2-c,4,5-c’]difuran-1,3,5,7-tetrone 1H,3H-Benzo[1,2-c:4,5-c']difuran-1,3,5,7-tetrone 1H,3H-Benzo[1,2-c:4,5-c’]difuran-1,3,5,7-tetrone Benzo[1,2-c Pyromellitic acid anhydride Pyromellitic acid dianhydride Pyromellitic anhydride pyromellitic1,2:4,5-dianhydride

Chemical Properties

Appearance	White powder
Melting point	283-286 °C(lit.)
Boiling point	397-400 °C(lit.)
bulk density	400-600kg/m3
density	1,68 g/cm³
vapor pressure	0Pa at 25℃
refractive index	1.6000 (estimate)
Fp	380 °C
storage temp.	2-30°C
solubility	Soluble in dimethyl sulfoxide, acetone, chloroform, ethyl ether, n-hexane and benzene.
form	Fine Powder
pka	5.45[at 20 ℃]
color	White to pale yellow
Water Solubility	decomposes
Sensitive	Moisture Sensitive
Usage	Pyromellitic dianhydride (PMDA) is employed as a curing agent for epoxy agent resins used for casting, laminating, the manufacture of moulding powders, adhesives and coatings.
BRN	213583
Henry's Law Constant	1.3×10³ mol/(m³Pa) at 25℃, HSDB (2015)
InChI	1S/C10H2O6/c11-7-3-1-4-6(10(14)16-8(4)12)2-5(3)9(13)15-7/h1-2H
InChIKey	ANSXAPJVJOKRDJ-UHFFFAOYSA-N
SMILES	O=C1OC(=O)c2cc3C(=O)OC(=O)c3cc12
LogP	-2.03 at 21.5℃
CAS DataBase Reference	89-32-7(CAS DataBase Reference)
NIST Chemistry Reference	1,2,4,5-Benzenetetracarboxylic anhydride(89-32-7)
EPA Substance Registry System	89-32-7(EPA Substance)

Safety Data

Symbol(GHS)	GHS05,GHS08
Signal word	Danger
Hazard statements	H317-H318-H334
Precautionary statements	P261-P272-P280-P284-P302+P352-P305+P351+P338
Hazard Codes	Xn
Risk Statements	R41:Risk of serious damage to eyes. R42/43:May cause sensitization by inhalation and skin contact . less more
Safety Statements	S22:Do not breathe dust . S24:Avoid contact with skin . S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S37/39:Wear suitable gloves and eye/face protection . less more
WGK Germany	1
RTECS	DB9300000
F	10-21
Autoignition Temperature	630°C
TSCA	Yes
REACH Registrations	Active
HS Code	29173980
Storage Class	11 - Combustible Solids
Hazard Classifications	Eye Dam. 1 Resp. Sens. 1 Skin Sens. 1
Hazardous Substances Data	89-32-7(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

Hazard

Skin irritant.

Chemical Properties

White powder. Soluble in some organic solvents; hydrolyzes to the acid when exposed to moisture.

Uses

Pyromellitic dianhydride (PMDA) is employed as a curing agent for epoxy agent resins used for casting, laminating, the manufacture of moulding powders, adhesives and coatings.

Uses

pyromellitic dianhydride be used for preparation polyimide and epoxy resin material.

Application

Pyromellitic dianhydride (PMDA) has been used extensively as an important monomer in the preparation of a variety of thermoplastics such as polyesters, polycarbonates, polyethers polyethers, plasticizersplasticizers, expoxy resins, etc. Moreover, it is also useful in the preparation of high performance coatings that have been widely employed in many fields in our daily life beacuase of its excellent thermal, oxidative stability and excellent mechanical properties.
Pyromellitic dianhydride (PMDA) is one of several highly reactive acid anhydrides and used extensively in the production of thermoplastics and high-performance coatings. Anhydrides including PMDA are respiratory irritants and immediate-type sensitisers. Some anhydrides have been associated with occupational asthma. PMDA has also been related to occupational asthma.

Preparation

Pyromellitic Dianhydride is prepared by gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives). An idealized equation is:
C6H2(CH3)4 + 6 O2 → C6H2(C2O3)2 + 6 H2O
In the laboratory, it can be prepared by dehydration of pyromellitic acid using acetic anhydride.

General Description

Pyromellitic dianhydride (PMDA) is an acidic anhydride that can be used as a repair agent and as a chain extender in the formation of polyethylene terephthalate (PET) based chain extensions. It is mainly used in the production of thermoplastics and other coating applications.

Flammability and Explosibility

Notclassified

Purification Methods

Crystallise the dianhydride from ethyl methyl ketone or dioxane. Dry, and sublime it in vacuo.[Beilstein 19 H 196, 19/5 V 407.]

Material Safety Data Sheet(MSDS)

Spectrum Detail

Well-known Reagent Company Product Information

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