Terephtalic acid

The terephtalic acid is one of isomers of the three Phtalic acid. It is an important acid on the commercial plan. It is mainly used as raw material in the industry of the Polyester (particularly the FART, component of some vétêments and plastic boots. It is also known under the name of acid 1,4-benzenedicarbonic or paraphtalic acid , and its rough chemical formula is C₆H₄ (COOH) ₂.

Terephtalic acid with the following topological formula:

Properties

It is almost insoluble in the Eau, the alcohol and the ether. It tends more to be sublimated than to liquefy itself when it is heated. Its insolubility makes it relatively not very practical during handling. Until approximately 1970, much of terephtalic acid gross was transformed into diméthylester by purification. The terephtalic acid contains groups Carboxyle which form Hydrogen bonds and allow the fixing of the molecules close and the formation to a solid ordinary temperature. It has a double acid character because it can form a Ester at each end like the ethylene glycol.

Artificial fiber

By polycondensation of the terephtalic acid (HOOC - C6H4 - COOH), with the ethylene glycol (HOCH2 - CH2OH), one obtains a type of artificial fiber known under the names of Terylene or Terylene.

See too

List of the acids

External bonds

Directive 2002/72/CE of the European commission concerning materials and objects out of plastic intended to come into contact with the foodstuffs

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