The pure product of m-trimethylaniline is colorless and transparent liquid. It is easy to change color when exposed to air and light. The product is often light brown, insoluble in water, but soluble in organic solvents such as ethanol and ether. Trimethylaniline is a kind of intermediate widely used in dye, pesticide and other industries. Trimethylaniline is synthesized from trimethylbenzene, which exists in petroleum. With the realization of large-scale industrial production in China, the output of mesitylene is increasing, so the development of its downstream products has been paid more and more attention. The downstream products of mesitylene, such as mesitylene acid, mesitylene aniline and m-acid, are important chemical products.