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[Chemical Knowledge]：Properties and Uses of Isophthalic Acid

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Isophthalic acid (IPA) is an important organic chemical raw material, which is widely used in the fields of medicine, pesticide, dye, plastic and fiber. This article will detail the properties and uses of isophthalic acid.

1. the properties of isophthalic acid

1. physical properties: isophthalic acid is a white crystalline powder, high melting point, 128-131 ℃, boiling point of 396 ℃, insoluble in water, slightly soluble in ethanol, ether and other organic solvents.

2. chemical properties: isophthalic acid with carboxyl acid, can occur esterification, amidation and other reactions. At the same time, isophthalic acid also has the structure of benzene ring, can occur electrophilic substitution reaction.

2. the use of isophthalic acid

1. pharmaceutical field: isophthalic acid is a synthetic raw material for many pharmaceutical intermediates, such as for the synthesis of anti-inflammatory drugs, antiepileptic drugs, anti-tuberculosis drugs. In addition, isophthalic acid can also be used for the synthesis of vitamin B5 (pantothenic acid).

2. Pesticide field: isophthalic acid can be used to synthesize some pesticides, such as fungicides, herbicides, etc.

3. Dye field: isophthalic acid can be used as a synthetic raw material for dye intermediates, for the synthesis of some red, purple, blue and other dyes.

4. plastic field: isophthalic acid can react with glycol and other glycols to generate polyester for the production of polyester plastics. Polyester plastics have good mechanical properties, heat resistance, chemical resistance and other advantages, and are widely used in electronics, automobiles, construction and other fields.

5. fiber field: isophthalic acid can be copolymerized with terephthalic acid to produce polyester fiber, namely polyester. Polyester has good elasticity, wrinkle resistance, wear resistance and other advantages, widely used in textiles, clothing and other fields.

In conclusion, isophthalic acid, as an important organic chemical raw material, has a wide range of applications in the fields of medicine, pesticides, dyes, plastics and fibers. With the continuous development of science and technology, the application field of isophthalic acid will continue to expand.

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