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US 8,946,471 B2Granted
Process for oxidizing an alkyl-aromatic compound
AssigneeUop LLC
InventorsAlakananda Bhattacharyya, Joel T. Walenga
Life of this patent
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Abstract
Processes for oxidizing an alkyl-aromatic compound are described. The processes include contacting an alkyl-aromatic compound, a solvent, a bromine source, a catalyst, and an oxidizing agent to produce a product comprising at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid. The composition of the solvent is controlled to reduce the impurities in the product.
Claims20
A process for oxidizing an alkyl-aromatic compound comprising:
- contacting an alkyl-aromatic compound, a solvent, a bromine source, a catalyst, and
- an oxidizing agent to produce a product comprising terephthalic acid and wherein a CIELAB b* value of the terephthalic acid is less than about 5;
- wherein the solvent comprises a carboxylic acid and an ionic liquid and wherein the solvent has a ratio of the carboxylic acid to the ionic liquid within a range of about 7:13 and 13:7 by weight;
- and
- wherein a cation of the ionic liquid is selected from the group consisting of imidazoles, pyrazoles, thiazoles, isothiazoles, azathiazoles, oxothiazoles, oxazolines, oxazaboroles, dithiazoles, triazoles, selenozoles, oxaphospholes, pyrroles, boroles, furans, thiophenes, phospholes, pentazoles, indoles, indulines, oxazoles, isothiazoles, tetrazoles, benzofuran, dibenzofurans, benzothiophenes, dibenzpthiophenes, thiadiazoles, pyrdines, pyrimidines, pyrazines, pyridazines, piperazines, piperidines, morpholines, pyrans, anilines, phthalazines, quinazolines, quinoxaline, and combinations thereof.
2 more elements
A process for oxidizing an alkyl-aromatic compound comprising:
- contacting an alkyl-aromatic compound, a solvent, a bromine source, a catalyst, and
- an oxidizing agent to produce a product comprising terephthalic acid and wherein a CIELAB b* value of the terephthalic acid is less than about 5;
- and
- maintaining a 4-CBA level in the product of less than about 2500 ppm by controlling a ratio of the solvent.
1 more element
A process for oxidizing an alkyl-aromatic compound comprising:
- contacting an alkyl-aromatic compound, a solvent, a bromine source, a catalyst, and
- an oxidizing agent to produce a product comprising at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid;
- and
- maintaining a CIELAB b* value of the product to less than about 5 by controlling a ratio of the solvent.
1 more element
Dependencies are inferred from the claim text.