Ortho-xylene (o-xylene CAS 95-47-6) is primarily produced by the catalytic reforming of petroleum naphtha or reformate, which is a mixture of hydrocarbons with 6 to 10 carbon atoms.
What Is o-Xylene CAS 95-47-6?
o-Xylene is an aromatic hydrocarbon with the molecular formula C6H4(CH3)2, in which two methyl substituents are attached to adjacent carbon atoms on the benzene ring (ortho configuration). It is a structural isomer of m-xylene and para-xylene; a mixture of the two is called mixed xylene. 1,2-dimethylbenzene is a colorless, slightly oily, flammable liquid. Most o-xylene is produced through petroleum cracking, which yields a series of aromatic compounds, including xylene isomers. m-Xylene isomerizes to o-xylene.
O-Xylene has many synonyms: ortho xylene; 1,2-dimethylbenzene; dimethylbenzene isomer; xylene isomer ortho; o-xylol.
Key Properties:
| Chemical Formula | C₈H₁₀ |
| Molecular Weight | 106.17 g/mol |
| Boiling Point | 144°C |
| Appearance | Colorless liquid |
| Solubility | Insoluble in water |
How Is o-Xylene Produced?
1. Catalytic Reforming of Petroleum Naphtha
The main method for producing o-xylene chemical is the catalytic reforming of petroleum naphtha.
Petroleum naphtha is heated and passed through a catalyst. This reaction produces aromatics, forming a BTX mixture (benzene, toluene, xylene). This mixture contains three types of xylene: o-xylene, m-xylene, and p-xylene.
2. Separation of Xylene Isomers
ortho-Xylene is mixed with other xylenes, so separation is necessary.
It has a high boiling point, so it can be separated by distillation. Plants also use methods such as adsorption or crystallization to improve purity. This produces high-purity o-xylene liquid for industrial applications.
3. Isomerization
Some m-xylene is converted to o-xylene to meet demand.
What Is ortho-xylene Used For in Chemical Manufacturing?
CAS 95-47-6 o-Xylene is an important aromatic solvent in the chemical industry. Its core practical applications in chemical manufacturing are as follows:
1. Main raw material for phthalic anhydride
This is the most important and widely used application of o-xylene in the entire chemical industry. Under specialized oxidation reaction conditions, pure o-xylene can be completely processed into phthalic anhydride. Phthalic anhydride is widely used in the production of flexible PVC plastic products, various indoor and outdoor wall coatings, industrial and building protective coatings, and strong adhesives.
2. Chemical intermediate in chemical production
o-xylene (CAS 95-47-6) is a stable and reliable chemical intermediate in the production of fine chemicals. It can be further processed and reacted to synthesize a variety of high-value chemical derivatives, including phthalonitrile, o-toluic acid, and industrial-grade dimethyl terephthalate (DMT). All these derivatives are core raw materials for synthetic fibers. Synthetic fibers made from orthoxylene derivatives are widely used in the production of clothing fabrics, home textiles, industrial fabrics, and other daily textiles, with a very broad market demand.
3. Highly Efficient Industrial Solvent
1,2-Dimethylbenzene possesses excellent solubility, stable chemical properties, and moderate volatility, making it a superior industrial solvent for industrial production workshops. It is commonly used for deep industrial cleaning of machinery and equipment, and for removing oil stains from metal surfaces without damaging the surface of mechanical parts. Furthermore, ortho xylene solvent is an essential additive in the formulation of printing inks, packaging inks, and various water-based and oil-based industrial coatings.
4. Core Raw Material for High-Performance Resin Materials
In addition to the common applications mentioned above, 1,2-dimethylbenzene is also a core raw material for high-performance resin materials. As a curing agent, o-xylene can rapidly cure resin materials, improving the hardness and durability of the finished product.
o-Xylene (ortho-xylene) CAS 95-47-6 Supplier
Safety Precautions
Aromatic hydrocarbon solvent o-xylene is flammable and must be handled properly. Store in a cool, well-ventilated place, away from heat sources and open flames. Wear appropriate personal protective equipment (PPE).
Conclusion
CAS 95-47-6 Orthoxylene is an important chemical intermediate, primarily obtained through catalytic reforming and the separation of mixed xylenes. It is mainly used in the production of phthalic anhydride and is therefore indispensable in the plastics, coatings, and resins industries.
With continued growth in global industrial demand, o-xylene solvent will remain a key component in chemical production.
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