Patent ID: 8916099

Claim:
A process for mixing two streams of catalyst comprising: feeding a first stream of catalyst to a riser in a first trajectory defining a first angle upwardly relative to vertical, said first stream of catalyst entering said riser at a first lowermost elevation; feeding a second stream of catalyst to said riser in a second trajectory defining a second angle upwardly relative to vertical that is greater than the first angle, said second stream of catalyst entering said riser at a second lowermost elevation that is lower than said first lowermost elevation; directing a portion of said second stream of catalyst to said riser at a second bottom trajectory defining a second bottom angle upwardly relative to vertical and directing another portion of said second stream of catalyst to said riser at a second top trajectory defining a second top angle upwardly relative to vertical, said second top angle being different from the second bottom angle; and passing said first stream of catalyst and said second stream of catalyst up said riser.