How Is p-Xylene (CAS 106-42-3) Produced Industrially?
p-Xylene is produced industrially primarily via the catalytic reforming of petroleum naphtha to produce a BTX (benzene, toluene, xylene) mixture, followed by the separation of xylene isomers and isomerization of m-/o-xylene. Key processes include fractional distillation, adsorption (e.g., Parex, Eluxyl), crystallization, and toluene disproportionation or methylation over catalysts like ZSM-5.
P-Xylene (Paraxylene) Properties
| CAS No.: | 106-42-3 |
|---|---|
| EC No.: | 203-396-5 |
| Linear Formula: | C₈H₁₀ |
| Molecular Weight: | 106.17 |
| Appearance: | Transparent Liquid |
| Melting Point: | 12-13 °C (lit.) |
| Boiling point | 138 °C (lit.) |
| Density: | 0.861 g/mL at 20 °C (lit.) |
Production Methods:
Coke-derived xylene is typically produced through the hydrocracking of xylene or the demethylation reaction of xylene.
Hydrocracking: Xylene reacts with hydrogen in the presence of a catalyst to produce coking xylene and hydrogen.
Demethylation Reaction: Xylene reacts with a catalyst such as aluminum chloride to remove a methyl group, yielding coking xylene.
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