Cumene is the common name for isopropylbenzene, an organic compound that is based on an aromatic hydrocarbon with an aliphatic substitution. It is a constituent of crude oil and refined fuels. It is a flammable colorless liquid that has a boiling point of 152 °C. Nearly all the cumene that is produced as a pure compound on an industrial scale is converted to cumene hydroperoxide, which is an intermediate in the synthesis of other industrially important chemicals, primarily phenol and acetone.
Video Cumene
Production
Commercial production of cumene is by Friedel-Crafts alkylation of benzene with propylene. Cumene producers account for approximately 20% of the global demand for benzene. Previously, solid phosphoric acid (SPA) supported on alumina was used as the catalyst. Since the mid-1990s, commercial production has switched to zeolite-based catalysts. The addition of two equivalents of propylene gives diisopropylbenzene (DIPB). Using transalkylation, DIPB is comproportionated with benzene.
Maps Cumene
Safety
Isopropylbenzene form peroxides upon contact with the air. Tests for peroxides are routinely conducted before heating or distilling.
See also
- Cumene process
- Pseudocumene
References
External links
- National Pollutant Inventory - Cumene fact sheet
- CDC - NIOSH Pocket Guide to Chemical Hazards
- Cumene Production from Benzene and Propylene Using Aluminum Chloride Catalyst
Source of article : Wikipedia
0 Comments