Process for the purification of a crude carboxylic axid slurry

• US 20070179312A1
• Filed: 01/17/2007
• Published: 08/02/2007
• Est. Priority Date: 02/02/2006
• Status: Abandoned Application

• Current Assignee: Eastman Chemical Company
• Original Assignee: Eastman Chemical Company
• Inventors: Lin, Robert, O'Meadhra, Ruairi Seosamh
• Application Number:
  US11/654,468
• Publication Number:
  US 20070179312A1
• Time in Patent Office: Days
• US Class Current: 562/410
• CPC Class Codes: C07C 51/265 having alkyl side chains which are oxidised to carboxyl groups
• CPC Class Codes: C07C 51/47 by solid-liquid treatment; by chemisorption
• CPC Class Codes: C07C 51/487 by treatment giving rise to chemical modification by chemisorption C07C51/47
• CPC Class Codes: C07C 63/26 1,4 - Benzenedicarboxylic acid

Abstract

Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone.

Claims

1. A process to produce a purified carboxylic acid product comprising:

(a) oxidizing an aromatic feed stock in a primary oxidation zone to form a crude carboxylic acid slurry;

wherein said crude carboxylic acid slurry comprises terephthalic acid;

(b) removing in a solid-liquid displacement zone impurities from said crude carboxylic acid slurry to form a slurry product; and

(c) oxidizing said slurry product in a staged oxidation zone to form a staged oxidation product;

wherein said oxidizing in said staged oxidation zone is conducted at a temperature between about 150°

C. to about 185°

C.

2. The process according to claim 1 wherein said oxidizing in said primary oxidation zone is conducted at a temperature between about 120°

C. to about 200°

C.

3. The process according to claim 1 wherein said oxidizing is at a higher temperature in said staged oxidation zone than in said primary oxidation zone.

4. The process according to claim 1 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

5. The process according to claim 2 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

6. The process according to claim 1 wherein said oxidizing in said staged oxidation zone is conducted at a temperature between about 160°

C. to about 185°

C.

7. The process according to claim 6 wherein said oxidizing in the primary oxidation zone is conducted at a temperature between about 120°

C. to about 200°

C.

8. The process according to claim 7 wherein said oxidizing is at a higher temperature in said staged oxidation zone than in said primary oxidation zone.

9. The process according to claim 8 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

10. The process according to claim 9 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

11. The process according to claim 1 wherein said oxidizing in said staged oxidation zone is conducted at a temperature between about 170°

C. to about 185°

C.

12. The process according to claim 11 wherein said oxidizing in the primary oxidation zone is conducted at a temperature between about 120°

C. to about 200°

C.

13. The process according to claim 12 wherein said oxidizing is at a higher temperature in said staged oxidation zone than in said primary oxidation zone.

14. The process according to claim 13 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

15. The process according to claim 14 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

16. A process to produce a purified carboxylic acid product comprising:

(a) oxidizing an aromatic feed stock in a primary oxidation zone to form a crude carboxylic acid slurry;

wherein said crude carboxylic acid slurry comprises terephthalic acid; and

(b) oxidizing said crude carboxylic acid slurry in a staged oxidation zone to form a staged oxidation product;

wherein said oxidizing in said staged oxidation zone is conducted at a temperature between about 150°

C. to about 175°

C.

17. The process according to claim 16 wherein said oxidizing in the primary oxidation zone is conducted at a temperature between about 120°

C. to about 200°

C.

18. The process according to claim 16 wherein said oxidizing is at a higher temperature in said staged oxidation zone than in said primary oxidation zone.

19. The process according to claim 16 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

20. The process according to claim 17 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

21. The process according to claim 16 wherein said oxidizing in said staged oxidation zone is conducted at a temperature between about 160°

C. to about 175°

C.

22. The process according to claim 21 wherein said oxidizing in the primary oxidation zone is conducted at a temperature between about 120°

C. to about 200°

C.

23. The process according to claim 22 and wherein said oxidizing is at a higher temperature in said staged oxidation zone than in said primary oxidation zone.

24. The process according to claim 21 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.

25. The process according to claim 22 wherein said staged oxidation product comprises 4 CBA, wherein the concentration of 4 CBA in said staged oxidation production is less than 250 ppm.