Is p-xylene (cas 106 42 3) the same as xylene?
p-xylene (CAS 106-42-3) isn't the same as xylene, but it's one of three isomers (ortho--xylene, meta-xylene, para-xylene).
p-Xylene (para-xylene) is an aromatic hydrocarbon. It is one of the three isomers of dimethylbenzene known collectively as xylenes. The p- stands for para-, indicating that the two methyl groups in p-xylene occupy the diametrically opposite substituent positions 1 and 4. It is in the positions of the two methyl groups, their arene substitution pattern, that it differs from the other isomers, o-xylene and m-xylene. All have the same chemical formula C6H4(CH3)2. All xylene isomers are colorless and highly flammable. The odor threshold of p-xylene is 0.62 parts per million (ppm).
CAS number: 106-42-3
Structure:
difference between xylene and p-xylene
| Feature | Xylene (Mixed Xylenes) | p-Xylene (Para-Xylene) |
|---|---|---|
| Chemical Nature | A mixture of isomers (o-, m-, p-xylene) and often ethylbenzene. | A single, pure chemical compound. |
| Primary Use | Solvent (in paints, coatings, inks, adhesives). Also used to produce phthalic anhydride (from o-xylene). | Chemical Feedstock for making PTA/PET (polyester, bottles). |
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