Patent ID: 8936767
Filing Date: 2015-01-20
Classification: B01J,C07C

Abstract:
1. A system for producing a polycarboxylic acid by contacting a slurry with a gas-phase oxidant, said system comprising: a primary oxidation reactor comprising a first slurry outlet; and a secondary oxidation reactor comprising a slurry inlet, a second slurry outlet, a normally lower oxidant inlet, and a normally upper oxidant inlet, wherein said slurry inlet is in downstream fluid-flow communication with said first slurry outlet, wherein said secondary oxidation reactor defines therein a secondary reaction zone having a maximum length L wherein said normally lower oxidant inlet is spaced from the bottom of said secondary reaction zone by less than 0.5 L wherein said normally upper oxidant inlet is spaced from the bottom of said secondary reaction zone by at least 0.5 L wherein said slurry inlet is spaced from the bottom of said secondary reaction zone by a distance in the range of from about 0.3 L