Processes for controlling the partial regeneration of spent catalyst from an MTO reaction
OwnerJohn J. Senetarinventor
Life of this patent
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Abstract
A method of controlling the regeneration of spent catalyst from an oxygenate-to-olefin reaction zone in order to provide a partially regenerated catalyst. The partially regenerated catalyst has between 1 to 4, or 1 to 3, or, 2 to 3 wt % coke. The regeneration is controlled by adjusting a ratio of air to recycled flue gas in the combustion gas passed to the regeneration zone. CO in the flue gas is removed in a CO oxidation zone which receives oxygen to oxidize CO to CO2.
Claims20
A process for controlling catalyst regeneration in a catalyst regeneration zone, the process comprising:
- introducing an oxygen containing gas into a catalyst regeneration zone;
- partially regenerating a stream of spent catalyst from an MTO reaction zone, the spent catalyst including coke;
- separating regenerated catalyst from a flue gas, the regenerated catalyst having a reduced amount of coke and the flue gas comprising carbon monoxide and carbon dioxide;
- recycling a portion of the flue gas to the catalyst regeneration zone with the oxygen containing gas;
- and,
- maintaining a ratio of carbon dioxide to carbon monoxide in the flue gas to be at least 0.5.
A process for controlling catalyst regeneration in a catalyst regeneration zone, the process comprising:
- introducing an oxygen containing gas into a catalyst regeneration zone;
- partially regenerating a stream of spent catalyst from an MTO reaction zone, the spent catalyst including coke;
- separating regenerated catalyst from a flue gas, the regenerated catalyst having a reduced amount of coke and the flue gas comprising oxygen;
- recycling a portion of the flue gas to the catalyst regeneration zone with the oxygen containing gas;
- and,
- maintaining an amount of oxygen in the flue gas to be less than 2%, by volume.
A process for partially regenerating catalyst from an MTO reaction zone, the process comprising:
- passing a stream of oxygen containing gas into a catalyst regeneration zone;
- passing a stream of spent catalyst from an MTO reaction zone to the catalyst regeneration zone, the spent catalyst including coke;
- combusting coke off of the spent catalyst to provide a partially regenerated catalyst comprising between 1 to 4%, by weight, coke;
- recycling a portion of a flue gas stream to the catalyst regeneration zone as the oxygen containing gas;
- controlling a ratio of air to flue gas in the oxygen containing gas in order to achieve the partially regenerated catalyst by maintaining at least one of the following parameters:
- an amount of oxygen in the flue gas to be less than 2%, by volume;
- a ratio of carbon dioxide to carbon monoxide in the flue gas to be at least 0.5;
- or, an oxygen utilization in the catalyst regeneration zone of at least 90%.
Dependencies are inferred from the claim text.