Products

Trimellitic Anhydride (TMA) is the anhydride of Trimellitic acid and is structurally derived from it. The molecule contains a central phenyl ring, which gives it an unsaturated and aromatic character. Of the original three carboxy groups of Trimellitic acid, one remains, meaning that Trimellitic Anhydride is still considered a carboxylic acid and can form esters with alcohols. The other two carboxy groups are linked together and form a cyclic structure, similar to phthalic anhydride, by splitting off a water molecule and a shared oxygen atom. This structural feature is also clear from the synonymous name 1,2,4-tricarboxybenzene-1,2-anhydride. In addition to synthesis from Trimellitic acid, Trimellitic anhydride can also be prepared through the oxidation of pseudocumene.

Under normal conditions, Trimellitic Anhydride (TMA) is an odorless solid that exists as colorless crystals or white scales. The compound is hygroscopic and sensitive to moisture, which is why it should be stored dry and airtight. In aqueous solution, TMA shows a strong acidic reaction. It only melts into a liquid melt above 167 °C and boils at 390 °C.

Trimellitic Anhydride (TMA) is extremely sensitive to moisture. However, the substance remains chemically stable under dry and airtight storage conditions. Although it is flammable, it is difficult to ignite. Particular caution is required as the fine powder of the compound can form explosive dust-air mixtures when whirled up. For this reason, TMA should be kept away from ignition sources such as electrostatic discharge, sparks, open flames or hot surfaces. During the combustion of Trimellitic Anhydride, dangerous and harmful gases such as carbon monoxide can be released.

Trimellitic Anhydride (TMA) is very hygroscopic and reacts strongly corrosively with water. Contact can cause severe irritation and burns to the skin, respiratory tract and eyes, with possible serious health effects and impairment of vision. Affected areas of the body should immediately be thoroughly rinsed with water to dilute and remove the acid residue and medical attention should be sought immediately.

Inhaling Trimellitic Anhydride can cause temporary difficulty breathing, coughing, asthmatic symptoms, increased nasal discharge, headaches, and nosebleeds. There is also a risk of serious health problems such as pulmonary edema. Animal studies have shown that oral ingestion of the compound can cause serious harm, including irritation and burns to the mucous membranes of the mouth and throat, and perforation of the stomach and esophagus.

Due to the health risks and the risk of explosion caused by dust-air mixtures of Trimellitic Anhydride, the formation and whirling up of fine particles must be strictly avoided. Comprehensive occupational safety measures should be taken to minimize exposure.

Trimellitic Anhydride is classified as slightly hazardous to water and can be harmful to aquatic organisms. Entry into bodies of water, soil and groundwater as well as into the sewage system must be prevented at all costs. The substance is not subject to official transport regulations.