Diethylbenzene
 The three isomers of diethylbenzene:
ortho-, meta-, and para-diethylbenzene (left to right) |
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| Identifiers | |
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| Properties | |
| Molar mass | 134.22 |
| Density | 0.87 g/mL |
| Hazards | |
| Flash point | 134.6 °F / 57 °C |
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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 | |
Diethylbenzene (DEB) refers to any of three isomers with the formula C6H4(C2H5)2. Each consists of a benzene ring and two ethyl substituents. The meta and para have the greater commercial significance. All are colorless liquids.
Diethylbenzenes arise as side-products of the alkylation of benzene with ethylene, which can described as two steps. The first step is the industrial route to ethylbenzene, which is produced on a large scale as a precursor to styrene.
The diethylbenzene is an inadvertent side product.
Using shape-selective zeolite catalysts, the para isomer can be produced in high selectivity.
Much diethylbenzene is recycled by transalkylation give ethylbenzene:
Diethylbenzene is used in a mixture with methyl and/or ethyl biphenyls as a low temperature heat transfer fluid.
Diethylbenzene is dehydrogenated to give divinylbenzene (DVB):
DVB is used in the production of crosslinked polystyrene.
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