Patent attributes
Systems and methods of improving synthesis gas quality in a fluid catalytic cracking unit are disclosed. In one example, a method comprises reacting a first stage regeneration gas comprising oxygen with spent catalyst from a reactor in a first stage of a regenerator to consume the oxygen in the first stage regeneration gas. This reaction produces a synthesis gas output and partially regenerated catalyst. The method further comprises reacting a second stage regeneration gas comprising oxygen with the partially regenerated catalyst in a second stage of the regenerator to regenerate the partially regenerated catalyst. This reaction produces the first stage regeneration gas for reaction with the spent catalyst in the first stage of the regenerator. Through the first and second stage reactions, the spent catalyst is regenerated and the synthesis gas quality is improved.
