Reaction engineering studies of methane coupling in fluidised-bed reactors

✍ Scribed by J.H. Edwards; K.T. Do; R.J. Tyler

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 502 KB
• Volume: 6
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(90)85037-o

✦ Synopsis

The oxidative coupling of methane has been conducted in 30 and 60mm dia. fluidised-bed reactors.

Methane conversions as high as 40% were achieved at isothermal conditions using methane/oxygen mixtures without diluents.

Pt the same contact time the two reactors had similar selectivities to hydrocarbons.

At 850°C the hydrocarbon selectivity decreased dramatically with increasing contact time but this effect was much less severe at lower temperatures.

Axial gas concentration profiles through the catalyst bed in the 60mm reactor indicated that at 850°C there was a raoid consumotion of oxygen and formation of products in the bottom section of the bed'followed by a net loss of hydrocarbon in the oxygen-free zone.

This loss was due to carbon formation on the catalyst which was circulated back to the oxygencontaining zone of the bed where the carbon was combusted.