Process for oxidizing impurities in crude terephthalic acid
Patents
| Language: |
Английский |
| Type: |
Patent request |
| Number |
WO 2014058943 A1 |
| Request number: |
PCT/US2013/063972 |
| Request date: |
Oct 9, 2013 |
| patent.field.start_date: |
|
| Registration date: |
|
| patent.field.request_publication_date: |
Apr 17, 2014 |
| Authors |
Bhattacharyya A.
,
Kuznetsova N.I.
,
Balʹzhinimaev B.S.
|
| Affiliations |
| 1 |
Honeywell UOP (formely UOP LLC)
|
|
A process for oxidizing solid crude terephthalic acid is described. The process includes contacting solid crude terephthalic acid with a solvent comprising a carboxylic acid and one or more of an ionic liquid or ammonium acetate; a bromine source; a catalyst; and an oxidizing agent to produce solid purified terephthalic acid at a temperature of 100 to 210°C, and a pressure of 2 to 4.5 MPa, for a time of 5 to 60 min, and recovering the solid purified terephthalic acid.