Process to enrich a carboxylic acid composition
View Patent ↗A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.
1. A process to produce an enriched composition suitable for use as a monomer stream in a step-growth polymerization process, said process comprising contacting an enrichment feed with at least one stream comprising terephthalic acid, wherein said at least one stream is obtained after all oxidation steps in a terephthalic acid (TPA) production process to form said enriched composition; wherein said enrichment feed comprises at least one compound selected from the group consisting of isophthalic acid, phthalic acid, benzene-tricarboxylic acid isomers, hydroxybenzoic acid isomers, hydroxymethylbenzoic acid isomers, dicarboxybiphenyl isomers, dicarboxystilbene isomers, tricarboxybiphenyl isomers, tricarboxybenzophenone isomers, dicarboxybenzophenone isomers, dicarboxybenzil isomers, form-acet-hydroxybenzoic acid isomers, acet-hydroxymethylbenzoic acid isomers, and phthaldehyde isomers; wherein said enriched composition is enriched in at least one of said compound relative to said at least one stream.
2. The process according to claim 1 wherein at least one said compounds is enriched by at least 10 ppmw.
3. The process according to claim 1 wherein at least one said compounds is enriched by at least 100 ppmw.
4. The process according to claim 1 wherein at least one said compounds is enriched by at least 1000 ppmw.
5. The process according to claim 1 wherein at least one said compounds is enriched by at least 5 wt %.
6. The process according to claim 1 wherein at least one said compounds is enriched by at least 25 ppmw.
7. The process according to claim 1 wherein at least one said said compounds is enriched by at least 30 wt %.
8. The process according to claim 1 wherein at least one of said compounds is enriched by at least 50 wt %.
9. The process according to claim 1 wherein at least three of said compounds are enriched.
10. The process according to claim 1 wherein at least five of said compounds are enriched.
11. The process according to claim 1 wherein at least seven of said compounds are enriched.
12. A process to produce an enriched composition suitable for use as a monomer stream in a step-growth polymerization process, said process comprising contacting an enrichment feed with at least one stream comprising terephthalic acid, wherein said at least one stream is obtained after a crystallization step in a terephthalic acid (TPA) production process to form said enriched composition; wherein said enrichment feed comprises at least one compound selected from the group consisting of isophthalic acid, phthalic acid, benzene-tricarboxylic acid isomers, hydroxybenzoic acid isomers, hydroxymethylbenzoic acid isomers, dicarboxybiphenyl isomers, dicarboxystilbene isomers, tricarboxybiphenyl isomers, tricarboxybenzophenone isomers, dicarboxybenzophenone isomers, dicarboxybenzil isomers, form-acet-hydroxybenzoic acid isomers, acet-hydroxymethylbenzoic acid isomers, and phthaldehyde isomers; wherein said enriched composition is enriched in at least one of said.
13. The process according to claim 12 wherein at least one of said compounds is enriched by at least 10 ppmw.
14. The process according to claim 12 wherein at least one of said compounds is enriched by at least 100 ppmw.
15. The process according to claim 12 wherein at least one of said compounds is enriched by at least 1000 ppmw.
16. The process according to claim 12 wherein at least one of said compounds is enriched by at least 5 wt %.
17. The process according to claim 12 wherein at least one of said compounds is enriched by at least 25 ppmw.
18. The process according to claim 12 wherein at least one of said compounds is enriched by at least 30 wt %.
19. The process according to claim 12 wherein said cooled carboxylic acid composition, or said crystallized slurry composition, or said slurry composition, or said crude carboxylic acid composition comprises terephthalic acid.
20. The process according to claim 12 wherein at least three of said compounds are enriched.
21. The process according to claim 12 wherein at least five of said compounds are enriched.
22. The process according to claim 12 wherein at least seven of said compounds are enriched.
23. A process to produce an enriched composition suitable for use as a monomer stream in a step-growth polymerization process, said process comprising subjecting an enrichment feed with at least one stream comprising terephthalic acid, wherein said at least one stream is obtained after a filtration step in a terephthalic acid (TPA) production to form said enriched composition; wherein said enrichment feed comprises at least one compound selected from the group consisting of isophthalic acid, phthalic acid, benzene-tricarboxylic acid isomers, hydroxybenzoic acid isomers, hydroxymethylbenzoic acid isomers, dicarboxybiphenyl isomers, dicarboxystilbene isomers, tricarboxybiphenyl isomers, tricarboxybenzophenone isomers, dicarboxybenzophenone isomers, dicarboxybenzil isomers, form-acet-hydroxybenzoic acid isomers, acet-hydroxymethylbenzoic acid isomers, and phthaldehyde isomers; wherein said enriched composition is enriched in at least one of said.
24. The process according to claim 23 wherein at least one of said compounds is enriched by at least 10 ppmw.
25. The process according to claim 23 wherein at least one of said compounds is enriched by at least 100 ppmw.
26. The process according to claim 23 wherein at least one of said compounds is enriched by at least 1000 ppmw.
27. The process according to claim 23 wherein at least one of said compounds is enriched by at least 5 wt %.
28. The process according to claim 23 wherein at least one of said compounds is enriched by at least 25 ppmw.
29. The process according to claim 23 wherein at least one of said compounds is enriched by at least 30 wt %.
30. The process according to claim 23 wherein at least three of said compounds are enriched.
31. The process according to claim 23 wherein at least five of said compounds are enriched.
32. The process according to claim 23 wherein at least seven of said compounds are enriched.
33. A process to produce an enriched composition suitable for use as a monomer stream in a step-growth polymerization process, said process comprising subjecting an enrichment feed with at least one stream comprising terephthalic acid, wherein said at least one stream is obtained after drying step in a terephthalic acid (TPA) production process to form said enriched composition; wherein said enrichment feed comprises at least one compound selected from the group consisting of isophthalic acid, trimellitic acid, 4,4′-dicarboxybuphenyl, pthalic, 4-hydroxymethylbenzoic acid, and 4-hydroxymethylbenzoic acid; wherein said enriched composition is enriched in at least one of said compound relative to said at least one stream.
34. The process according to claim 33 wherein at least one of said compounds is enriched by at least 10 ppmw.
35. The process according to claim 33 wherein at least one of said compounds is enriched by at least 100 ppmw.
36. The process according to claim 33 wherein at least one of said compounds is enriched by at least 1000 ppmw.
37. The process according to claim 33 wherein at least one of said compounds is enriched by at least 5 wt %.
38. The process according to claim 33 wherein at least one of said compounds is enriched by at least 25 ppmw.
39. The process according to claim 33 wherein at least one of said compounds is enriched by at least 30 wt %.
40. The process according to claim 33 wherein at least three of said compounds are enriched.
41. The process according to claim 33 wherein all of said compounds are enriched.