Process for oxidizing impurities in crude terephthalic acid
Патенты
| Язык: |
Английский |
| Тип: |
Заявка на патент |
| Номер (11) |
US 20140107375 A1 |
| Номер заявки (21): |
13/650,731 |
| Дата подачи заявки (22): |
12 окт. 2012 г. |
| Дата начала отсчета срока действия патента (24): |
|
| Дата публикации патента (44,45,46): |
|
| Дата публикации заявки (43): |
17 апр. 2014 г. |
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 about 100 to about 210 DEG C., and a pressure of about 2 to about 4.5 MPa, for a time of about 5 to about 60 min, and recovering the solid purified terephthalic acid.