Para-Xylene (p-Xylene, CAS 106-42-3) - also known as 1,4-Dimethylbenzene - is a colorless aromatic hydrocarbon with high purity and excellent solvency. It is one of the most important intermediates in the petrochemical industry, serving as a core raw material for PTA (Purified Terephthalic Acid) and DMT (Dimethyl Terephthalate) production. These intermediates are widely used in polyester resin, plastic packaging, and fiber manufacturing.
Industrial Para-Xylene (p-Xylene) for Coating & Plastic Applications
Para-Xylene (p-Xylene) is a crucial chemical raw material for the production of polyester fibers (such as polyester), plastics (PET), coatings, inks, and solvents.
- Polyester Industry Chain: As a direct raw material for PTA (purified terephthalic acid), it accounts for over 90% of global p-xylene consumption. PTA is further polymerized with ethylene glycol to produce PET resin, used in textiles (polyester) and beverage bottles (food-grade PET).
- Solvent Applications: Widely used in paint and ink thinners, especially as a substitute for toluene in automotive coatings.
- Chemical Intermediates: Through oxidation reactions, it can synthesize dimethyl terephthalate (DMT), p-methylbenzoic acid, etc., used in plasticizers and pesticide intermediates.
Chemical Properties of Para-Xylene (p-Xylene)
P-Xylene is a colorless, transparent liquid with an aromatic odor. Its molecular formula is C8H10, with two methyl groups located at the para position of the benzene ring. p-Xylene has a boiling point of 138.4℃, a melting point of 13.2℃, and a density of 0.861 g/cm³. It is sparingly soluble in water but miscible with most organic solvents, such as ethanol, ether, and benzene.
In terms of chemical properties, p-xylene exhibits typical aromatic hydrocarbon properties. It can undergo substitution and oxidation reactions. For example, in the presence of an oxidizing agent, p-xylene can be oxidized to terephthalic acid; in the presence of a halogenating agent, it can undergo halogenation reactions to produce the corresponding halo-p-xylenes.
Physical Properties of Para-Xylene (p-Xylene)
The physical properties of p-xylene include its density, boiling point, melting point, and solubility. p-Xylene has a low density, approximately 0.861 g/cm³, allowing it to float on water. Its melting point is 13.2℃, indicating that p-xylene is liquid at room temperature but may solidify in cold environments.
P-xylene has a boiling point of 138.4℃, allowing it to evaporate at relatively high temperatures, a favorable characteristic for distillation separation techniques. P-xylene is poorly soluble in water but readily soluble in most organic solvents, a significant advantage in solvent extraction and chemical reaction processes.
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- Product specifications (technical data sheet);
- COA and MSDS;
