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[Chemical Knowledge]：Properties and Uses of OX (o-Xylene)

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Ortho-xylene (OX) is an important organic chemical raw material, which is widely used in the production of various chemicals and polymers. It has unique properties and a wide range of uses, and has become one of the raw materials that have attracted much attention in the field of chemical production. This article will detail the nature and use of o-xylene.

1. the nature of o-xylene

o-xylene is a colorless, transparent, aromatic smell of liquid. Its molecular formula is C8H10, structural formula is C6H4(CH3)2, which belongs to benzene homologs. Ortho-xylene has the following properties:

1. physical properties: o-xylene has a boiling point of 144.4 ℃, a melting point of -25.2 ℃, a relative density of 0.88, a refractive index of 1.501, and a flash point of 25 ℃. It is insoluble in water but miscible with many organic solvents.
2. Chemical properties: o-xylene has high chemical stability and is not easy to occur oxidation, addition and other reactions. However, under certain conditions, it can undergo substitution, polymerization and other reactions to generate a series of derivatives.

2. the use of ortho-xylene

ortho-xylene as an important chemical raw material, widely used in various fields, the following is its main purpose:

1. production of phthalic anhydride: ortho-xylene in the role of catalyst, can be oxidized to produce phthalic anhydride. Phthalic anhydride is an important chemical raw material for the production of plasticizers, unsaturated polyester resins, alkyd resins, etc.
2. Production of phenol and acetone: o-xylene can be converted to phenol and acetone. Phenol is an important organic chemical raw material for the production of phenolic resin, bisphenol A and so on. Acetone is a solvent and an organic synthesis intermediate.
3. Production of maleic anhydride: o-xylene can be oxidized to generate maleic anhydride, which is used to produce unsaturated polyester resin, alkyd resin, pesticide, etc.
4. Production of chlorinated benzene: o-xylene can react with chlorine to generate chlorinated benzene, which is an important intermediate for the production of pesticides, medicines, dyes, etc.

In conclusion, o-xylene, as an important organic chemical raw material, has a wide range of uses in the field of chemical production. Due to its unique properties and uses, the production and development of o-xylene has been of great interest. With the continuous progress of science and technology and the continuous expansion of applications, o-xylene will continue to play an important role in the field of chemical production in the future.

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