Pyromellitic dianhydride
From Infogalactic: the planetary knowledge core
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| Identifiers | |
|---|---|
| 89-32-7 | |
| Properties | |
| C10H2O6 | |
| Molar mass | 218.12 |
| Appearance | white solid |
| Melting point | 283 to 286 °C (541 to 547 °F; 556 to 559 K) |
| Boiling point | 397 to 400 °C (747 to 752 °F; 670 to 673 K) |
| hygroscopic | |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Pyromellitic dianhydride is an organic compound with the formula C6H2(C2O3)2. It is the double carboxylic acid anhydride that is used in the preparation of polyimide polymers such as Kapton. It is a white solid.
It is prepared by gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives). An idealized equation is:[1]
- C6H2(CH3)4 + 6 O2 → C6H2(C2O3)2 + 6 H2O
References
- ↑ F. Röhrscheid "Carboxylic Acids, Aromatic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a05_249
