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US 8,940,255 B2Granted
Oxidation system with sidedraw secondary reactor
AssigneeGrupo Petrotemex, S.A. de C.V.
InventorsAshfaq Shaikh, Alan George Wonders
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Abstract
Disclosed are process and apparatus for vertical splitting of the oxygen supply to a post-oxidation reactor. Further disclosed are process and apparatus for supplying reaction medium to a post-oxidation reactor at a mid-level inlet. Such apparatus and process can assist in reducing oxygen pinch throughout the post-oxidation reactor.
Claims22
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 secondary reaction zone having a maximum length LS and a maximum diameter DS,
- a slurry inlet spaced from the bottom of said secondary reaction zone by a distance in the range of from about 0.3 LS to about 0.9 LS;
- a normally upper oxidant inlet spaced less than 0.4 LS from said slurry inlet;
- a normally lower oxidant inlet spaced from the bottom of said secondary reaction zone by less than 0.3 LS;
- and
- a second slurry outlet;
- wherein said slurry inlet is in downstream fluid-flow communication with said first slurry outlet.
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A method for making a polycarboxylic acid composition, said method comprising:
- (a) subjecting a first multi-phase reaction medium comprising an oxidizable compound to oxidation in a primary reaction zone defined in a primary oxidation reactor to thereby produce a first slurry;
- and
- (b) contacting at least a portion of said first slurry with a gas-phase oxidant in a secondary reaction zone defined in a secondary oxidation reactor to thereby produce a second slurry,
- wherein said secondary reaction zone has a maximum length LS and a maximum diameter DS,
- a normally upper oxidant inlet spaced less than 0.4 LS from said slurry inlet;
- a normally lower oxidant inlet spaced from the bottom of said secondary reaction zone by less than 0.3 LS;
- wherein at least a portion of said first slurry is introduced into said secondary reaction zone at a slurry inlet region spaced from the bottom of said secondary reaction zone by a distance in the range of from about 0.3 LS to about 0.94 LS.
4 more elements
Dependencies are inferred from the claim text.