| abstract |
Hydrogen and at least one carbon oxide are converted into olefins by reaction with a first catalyst (12) to produce a product and a second catalyst (14) adapted to convert said product into olefins. The first and second catalysts can be in separate successive reaction zones (12, 14), or in a single reaction zone. n The reaction product is separated into an olefin rich stream (18) and at least one carbon oxide which is recycled (22) to the catalytic reaction zone (12, 14). Paraffins from the reaction product may be passed through a steam reformer (20) and then, optionally with carbon oxide from recycle (22), through a shift reactor (24), and then passed for recycle to the catalytic reaction zone (12, 14). |