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.

Claims

22 · 2 independent · depth 5

22 granted claims

›1.independentA system for producing a polycarboxylic acid by contacting a slurry with a gas-phase oxidant, said system comprising:na primary oxidation reactor comp…+10

›2.↳ 1The system of claim 1, wherein said primary oxidation reactor comprises a reaction zone with an oxidant sparger, wherein said oxidant sparger consists…d2+3

›3.↳ 1The system of claim 1, wherein said normally upper oxidant inlet is spaced from the bottom of said secondary reaction zone by at least 0.5 LS.d2

›5.↳ 1The system of claim 1, wherein said slurry inlet is spaced from the bottom of said secondary reaction zone by a distance in the range of from about 0.…d2

›6.↳ 1The system of claim 1, wherein said slurry inlet is spaced from the bottom of said secondary reaction zone by a distance in the range of from about 9 …d2

›7.↳ 1The system of claim 1, wherein said secondary reaction zone has an LS:DS ratio in the range of from about 14:1 to about 28:1.d2

›8.↳ 1The system of claim 1, wherein said first slurry outlet and said slurry inlet have substantially the same vertical elevation, wherein said first slurr…d2

›9.↳ 1The system of claim 1, wherein said primary oxidation reactor is a bubble column reactor, wherein said secondary oxidation reactor is a bubble column …d2

›12.independentA method for making a polycarboxylic acid composition, said method comprising:n(a) subjecting a first multi-phase reaction medium comprising an oxidiz…+10

›13.↳ 12The method of claim 12, wherein said primary oxidation reactor comprises a reaction zone with an oxidant sparger, wherein said oxidant sparger consist…d2+2

›16.↳ 12The method of claim 12, wherein at least 75 weight percent of said first slurry is introduced into said secondary reaction zone at said slurry inlet r…d2

›17.↳ 12The method of claim 12, wherein at least a portion of said gas-phase oxidant and at least a portion of said first slurry combine in said secondary rea…d2+1

›19.↳ 12The method of claim 12, wherein said first and second slurries each comprise para-toluic acid in the liquid phase, wherein said second slurry has a ti…d2

›20.↳ 12The method of claim 12, wherein said oxidizable compound is para-xylene, wherein said polycarboxylic acid is terephthalic acid, wherein said gas-phase…d2

›21.↳ 12The method of claim 12, wherein said primary oxidation reactor is a bubble column reactor, wherein said secondary oxidation reactor is a bubble column…d2

›22.↳ 12The method of claim 12, wherein said reaction zone has an LS:DS ratio in the range of from about 14:1 to about 28:1.d2

Classifications

23 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B01J35/02
B01J19/24
B01J8/18
B01J19/00
B01J8/22
B01J8/00
B01J10/00

Section C — Chemistry; metallurgy

C07C51/21
C07C51/16
C07C51/255
C07C51/265
C07C51/00

USPC · US Patent Classification

422/642562/408422/139422/129422/187562/407422/630562/409422/600562/412562/413

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Pendency

4.2 y

1,518 days filing → grant

Office actions

after a restriction

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no RCE

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Examiner

Natasha Young

art unit 1774 · TC 1700

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Citations: 22 back · 0 forward

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Priority chain

2 priority documents

Priority

29 Jan 2010

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 61299450	29 Jan 2010
related publication	US 20110190537 A1	4 Aug 2011

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