Pressurized crude aromatic carboxylic acid feed mixes
Processes for manufacturing a purified aromatic carboxylic acid include heating a purification reaction mixture in a pre-heating zone, the purification reaction mixture comprising a crude aromatic carboxylic acid and a solvent, and purifying the crude aromatic carboxylic acid in the purification reaction mixture to form a purified aromatic carboxylic acid product. One or more operations are maintained at a pressure above ambient in order to achieve energy savings.
1. A process for manufacturing a purified aromatic carboxylic acid comprising:
heating a purification reaction mixture in a pre-heating zone; the purification reaction mixture comprising a crude aromatic carboxylic acid and solvent, the purification reaction mixture entering the pre-heating zone at a pressure above ambient; and
purifying the crude aromatic carboxylic acid in the purification reaction mixture in a purification zone to form a purified aromatic carboxylic acid product.
2. A process for manufacturing a purified aromatic carboxylic acid comprising:
heating a purification reaction mixture in a pre-heating zone; the purification reaction mixture comprising a crude aromatic carboxylic acid and solvent, the purification reaction mixture entering the pre-heating zone at a temperature above 100° C.; and
purifying the crude aromatic carboxylic acid in the purification reaction mixture in a purification zone to form a purified aromatic carboxylic acid product.
3. A process for manufacturing a purified aromatic carboxylic acid comprising:
mixing crude aromatic carboxylic acid and a solvent in a mixing zone to form purification reaction mixture, the solvent being fed to the mixing zone at a pressure above ambient;
heating a purification reaction mixture in a pre-heating zone; the purification reaction mixture comprising a crude aromatic carboxylic acid and solvent, the purification reaction mixture entering the pre-heating zone at a temperature above 100° C.; and
purifying the crude aromatic carboxylic acid in the purification reaction mixture in a purification zone to form a purified aromatic carboxylic acid product.
4. The process of claim 1 , further comprising:
forming the purification reaction mixture in mixing zone by mixing a solvent with a stream comprising crude aromatic carboxylic acid.
5. The process of claim 4 , wherein the solvent enters the mixing zone at a pressure above ambient.
6. The process of claim 3 or 5 , wherein solvent enters the mixing zone at a pressure of at least 1 bar(g).
7. The process of claim 3 or 5 , wherein the solvent containing stream enters the mixing zone at a pressure of at least 2 bar(g).
8. The process of claim 3 or 4 , wherein the solvent containing stream enters the mixing zone at temperature above 100° C.
9. The process of claim 3 or 4 , wherein the solvent containing stream enters the mixing zone at a temperature of at least 120° C.
10. The process of claim 3 or 4 , wherein the mixing zone is maintained at a pressure of at least 2 bar(g).
11. The process of claim 1 , 2 , or 3 , wherein the purification reaction mixture enters the pre-heating zone at a pressure of at least 80 bar(g).
12. The process of claim 1 or 2 , wherein the purification reaction mixture enters the pre-heating zone at a temperature above 100° C.
13. The process of claim 1 , 2 , or 3 wherein the purification reaction mixture enters the pre-heating zone at a temperature of at least 120° C.
14. The process of claim 1 , 2 , or 3 wherein the aromatic carboxylic acid comprises terephthalic acid.
15. The process of claim 1 , 2 , or 3 further comprising:
oxidizing a substituted aromatic compound in a reaction zone to form the crude aromatic carboxylic acid;
transferring effluent from the reaction zone to a crystallization zone; and
recovering at least a portion of the crude aromatic carboxylic as a solid from the crystallization zone;
transferring effluent from the crystallization zone to a solid-liquid separation device, wherein the solid-liquid separation device is configured for operation above ambient pressure.
16. The process of claim 15 wherein the solid-liquid separation device comprises a rotary pressure filter.
17. The process of claim 1 , 2 , or 3 wherein the purification zone comprises a hydrogenation reactor, and wherein the purifying comprises contacting an aqueous solution that comprises at least a portion of the crude aromatic carboxylic acid with hydrogen in the presence of a catalyst.
18. The process of claim 1 , 2 , or 3 wherein the solvent comprises water.