What are 5 uses for para xylene (CAS 106-42-3)?

Para Xylene (PX) is an important chemical raw material widely used in various industrial fields. This article will analyze in detail the uses, properties, and production methods of p-xylene.

is as a raw material for the production of purified terephthalic acid (PTA). PTA is a key intermediate in the manufacture of polyethylene terephthalate (PET), which is widely used in products such as fibers, films, and plastic bottles.

Para Xylene (PX) is also used in the production of other chemical products, such as benzoic acid and p-tolualdehyde. These compounds have important applications in pharmaceuticals, pesticides, and coatings. For example, benzoic acid is a raw material for the manufacture of preservatives and is widely used in the food and pharmaceutical industries. P-tolualdehyde is an intermediate in the manufacture of pesticides and dyes.

P-xylene is a colorless, transparent liquid with an aromatic odor. Its molecular formula is C8H10, and the two methyl groups in its molecular structure are 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, diethyl ether, and benzene.

Chemically, 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 haloxylenes.

The physical properties of p-xylene include its density, boiling point, melting point, and solubility. Its low density of approximately 0.861 g/cm³ allows it to float on water. Its melting point of 13.2℃ indicates that p-xylene is liquid at room temperature but may solidify in cold environments.

The boiling point of p-xylene at 138.4℃ allows 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.

There are two main methods for producing PX: one is through naphtha catalytic reforming to produce aromatics, and then separating PX from the mixed aromatics; the other is through toluene disproportionation to produce PX.

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