Claims
- 1. A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to
- obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to
- obtain 3,4,5,6-tetrafluorophthaloyldifluoride and/or 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone, and further reacting the tetrafluorophthalolyldifluoride and/or the hexafluoro-1-[3H]-isobenzofuranone with an inorganic base or an organic acid to obtain tetrafluorophthalic anhydride.
- 2. A process for producing tetrafluorophthalic anhydride, which comprises reacting 3,4,5,6-tetrafluorophthaloyldifluoride and/or 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone with an Inorganic base or an organic acid to obtain tetrafluorophthalic anhydride.
- 3. A process for producing tetrafluorophthalic anhydride, which comprises reacting 3,4,5,6-tetrafluorophthaloyldifluoride with an Inorganic base or an organic acid to obtain tetrafluorophthalic anhydride.
- 4. A process for producing tetrafluorophthalic anhydride, which comprises reacting 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone with an Inorganic base or an organic acid to obtain tetrafluorophthalic anhydride.
- 5. The process according to claim 1, wherein the inorganic base is sodium carbonate or potassium carbonate.
- 6. The process according to claim 2, wherein the inorganic base is sodium carbonate or potassium carbonate.
- 7. The process according to claim 3, wherein the inorganic base is sodium carbonate or potassium carbonate.
- 8. The process according to claim 4, wherein the inorganic base is sodium carbonate or potassium carbonate.
- 9. The process according to claim 2, wherein the amount of the inorganic base is from 0.3 to 1.5 times weight parts to the total weight amount of the 3,4,5,6-tetrafluorophthaloyl-difluoride and the 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone.
- 10. The process according to claim 4, wherein the amount of the inorganic base is from 0.3 to 1.5 times weight parts to the total weight amount of the 3,4,5,6-tetrafluorophthaloyl-difluoride and the 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone.
- 11. The process according to claim 1, wherein the organic acid is an organic carboxylic acid.
- 12. The process according to claim 2, wherein the organic acid is an organic carboxylic acid.
- 13. The process according to claim 3, wherein the organic acid is an organic carboxylic acid.
- 14. The process according to claim 4, wherein the organic acid is an organic carboxylic acid.
- 15. The process according to claim 11, wherein the organic acid is acetic acid.
- 16. The process according to claim 12, wherein the organic acid is acetic acid.
- 17. The process according to claim 13, wherein the organic acid is acetic acid.
- 18. The process according to claim 14, wherein the organic acid is acetic acid.
- 19. The process according to claim 2, wherein the amount of the organic acid is from 0.5 to 20 times mol amount to the total weight amount of the 3,4,5,6-tetrafluorophthaloyldifluoride and the 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone.
- 20. The process according to claim 4, wherein the amount of the organic acid is from 0.5 to 20 times mol amount to the total weight amount of the 3,4,5,6-tetrafluorophthaloyldifluoride and the 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone.
Priority Claims (3)
Number |
Date |
Country |
Kind |
6-25528 |
Feb 1994 |
JPX |
|
6-26897 |
Feb 1994 |
JPX |
|
6-34681 |
Mar 1994 |
JPX |
|
Parent Case Info
This is a continuation, of application Ser. No. 08/391,060 filed Feb. 21, 1995, now U.S. Pat No. 5,523,476.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
Country |
Parent |
391060 |
Feb 1995 |
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