CAS 95-47-6 Ortho-Xylene (o-Xylene) is an organic compound with the chemical formula C8H10. It is a colorless, transparent liquid, insoluble in water, but miscible with most organic solvents such as ethanol, ether, and chloroform.
Key Physical and Chemical Properties
Molecular Weight: 106.16 g/mol
Boiling Point: 144.4°C
Melting Point: -25.2°C
Density: 0.88 g/cm³ (20°C)
Solubility: Easily soluble in ethanol and ether, insoluble in water
Main Applications of o-Xylene
- Production of Phthalic Anhydride: This is the main use of o-xylene. Phthalic anhydride can be used to manufacture plasticizers, polyester resins, and alkyd resins, etc.
- As a Solvent: Due to its strong dissolving power, it can be used as a solvent for paints, coatings, varnishes, inks, and pesticides.
- Pesticide and Dye Production: Used as an intermediate in the synthesis of various pesticides and dyes.
- Others: An important raw material for the synthesis of other organic chemicals.
Why is Ortho-xylene Crucial in the Chemical Industry?
As global demand for coatings, plastics, resins, and construction materials continues to rise, market demand for ortho-xylene remains consistently strong.
Unlike mixed xylenes which consist of multiple isomers and ethylbenzene, o-xylene is a high-purity single isomer. It maintains uniform composition throughout batches and features steady chemical characteristics. When applied in production, it delivers predictable and consistent reaction behavior. For these reasons, it serves as a premium and dependable feedstock tailored for the synthesis of high-grade chemical intermediates.
For manufacturing processes that demand rigorous precision in composition and stability in product quality, ortho-xylene remains an indispensable and critical raw material.
Ortho-Xylene vs Mixed Xylene
Although both are aromatic hydrocarbons, they serve distinct purposes within the industrial market.
| Property | O-Xylene | Mixed Xylene |
|---|---|---|
| Composition | Single isomer | Blend of xylene isomers |
| Main Use | Chemical intermediate | Industrial solvent |
| Purity | High consistency | Variable composition |
| Typical Industries | Plasticizers, resins | Paints, coatings, inks |
| Price | Usually higher | More economical |
| Commercial Role | Specialized raw material | General-purpose solvent |
Advantages of Industrial Grade Ortho-Xylene Solvent
1. Excellent Raw Material for Phthalic Anhydride Production
Ortho-xylene is the primary feedstock used in phthalic anhydride manufacturing. Its stable single-isomer structure helps improve reaction consistency and production efficiency in large-scale chemical processing.
2. Strong Solvency for Coatings and Resin
O-xylene can effectively dissolve alkyd resins, synthetic resins and many industrial coating ingredients. It helps improve coating flow, viscosity control and surface leveling performance.
3. Balanced Evaporation Rate
Compared with some fast-evaporating solvents, ortho-xylene provides a more controlled evaporation rate, which helps reduce coating defects such as blistering, uneven drying and surface whitening.
4. Good Compatibility with Industrial Formulations
Ortho-xylene is compatible with a wide range of industrial products including paints, varnishes, adhesives, pesticides and printing inks, making it a versatile solvent in chemical manufacturing.
5. High Chemical Stability During Storage and Transportation
Industrial o-xylene maintains stable performance under proper storage conditions, making it suitable for bulk transportation and long-term industrial use.
6. Widely Used in Resin and Plasticizer Manufacturing
Because ortho-xylene is an important intermediate for producing phthalic anhydride, it plays a key role in the manufacturing of plasticizers, polyester resins and alkyd coatings.
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