Trimellitic anhydride

Structural formula
General
Surname	Trimellitic anhydride
other names	Trimellitic anhydride; 1,2,4-tricarboxybenzene-1,2-anhydride; 1,2,4-benzenetricarboxylic acid 1,2-anhydride; IUPAC : 1,3-dioxo-2-benzofuran-5-carboxylic acid; Benzene-1,2,4-tricarboxylic acid-1,2-anhydride;
Molecular formula	C 9 H 4 O 5
Brief description	hygroscopic, odorless, colorless crystals
External identifiers / databases
EC number	209-008-0
ECHA InfoCard	100.008.190
PubChem	11089
Wikidata	Q1675143
properties
Molar mass	192.13 g · mol -1
Physical state	firmly
density	1.54 g cm −3
Melting point	164-168 ° C
boiling point	240 ° C (19 h Pa )
solubility	Decomposes in water
safety instructions
H and P phrases	H: 317-318-334-335
	P: 261-280-305 + 351 + 338-342 + 311
Authorization procedure under REACH	Of particular concern: Serious effects on human health are considered likely
MAK	DFG : 0.04 mg m −3 ; Switzerland: 0.005 ml m −3 or 0.04 mg m −3 ;
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Trimellitic anhydride (TMA) , also known as trimellitic anhydride , is a basic material for the synthesis of varnish resins , plasticizers , polyesters , hardeners for epoxy resins and dyes, among other things .

Extraction and presentation

Trimellitic anhydride is formed from trimellitic acid by splitting off water .

use

Trimellitic anhydride can replace trimellitic acid in the manufacture of certain plastics .

Trimellitic anhydride is corrosive and must be handled with care. Extensive studies on the risk assessment of acid anhydrides including trimellitic anhydride were published in late 2004 and 2009.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on trimellitic anhydride in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .
↑ Entry on benzene-1,2,4-tricarboxylic acid-1,2-anhydride in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
↑ Entry in the SVHC list of the European Chemicals Agency , accessed on August 12, 2018.
↑ Schweizerische Unfallversicherungsanstalt (Suva): Limit values - current MAK and BAT values (search for 552-30-7 or trimellitic anhydride ), accessed on November 2, 2015.
↑ Helena Keskinen: 136. Cyclic acid anhydrides . National Institute for Working Life / Nordic Council of Ministers, Dec. 2004.
^ World Health Organization: Concise International Chemical Assessment Document 75. Cyclic Acid Anhydrides: Human Health Aspects. 2009.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on trimellitic anhydride in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .

[CLP_100.008.190-2] Entry on benzene-1,2,4-tricarboxylic acid-1,2-anhydride in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[SVHC-3] Entry in the SVHC list of the European Chemicals Agency , accessed on August 12, 2018.

[4] Schweizerische Unfallversicherungsanstalt (Suva): Limit values - current MAK and BAT values (search for 552-30-7 or trimellitic anhydride ), accessed on November 2, 2015.

[5] Helena Keskinen: 136. Cyclic acid anhydrides . National Institute for Working Life / Nordic Council of Ministers, Dec. 2004.

[6] World Health Organization: Concise International Chemical Assessment Document 75. Cyclic Acid Anhydrides: Human Health Aspects. 2009.