BE781730A - Procede de fabrication d'acide pyromellique exempt de coloration - Google Patents
Procede de fabrication d'acide pyromellique exempt de colorationInfo
- Publication number
- BE781730A BE781730A BE781730A BE781730A BE781730A BE 781730 A BE781730 A BE 781730A BE 781730 A BE781730 A BE 781730A BE 781730 A BE781730 A BE 781730A BE 781730 A BE781730 A BE 781730A
- Authority
- BE
- Belgium
- Prior art keywords
- coloration
- manufacturing process
- acid manufacturing
- pyromellic acid
- pyromellic
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH467971A CH539597A (de) | 1971-04-26 | 1971-04-26 | Verfahren zur Herstellung von farbloser Pyromellithsäure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE781730A true BE781730A (fr) | 1972-07-31 |
Family
ID=4280583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE781730A BE781730A (fr) | 1971-04-26 | 1972-04-06 | Procede de fabrication d'acide pyromellique exempt de coloration |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE781730A (xx) |
| CH (1) | CH539597A (xx) |
| FR (1) | FR2134513A1 (xx) |
| IT (1) | IT959635B (xx) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3015988A1 (de) * | 1980-04-25 | 1981-11-05 | Akzo Gmbh, 5600 Wuppertal | Verfahren zur herstellung bzw. reinigung von di- und polycarbonsaeureanhydriden |
| US6579990B2 (en) | 2000-08-23 | 2003-06-17 | Mitsubishi Gas Chemical Company, Inc. | Process for producing refined pyromellitic acid and refined pyromellitic anhydride |
-
1971
- 1971-04-26 CH CH467971A patent/CH539597A/de not_active IP Right Cessation
-
1972
- 1972-04-06 BE BE781730A patent/BE781730A/xx unknown
- 1972-04-22 IT IT2348272A patent/IT959635B/it active
- 1972-04-25 FR FR7214715A patent/FR2134513A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2134513A1 (en) | 1972-12-08 |
| FR2134513B1 (xx) | 1975-06-20 |
| IT959635B (it) | 1973-11-10 |
| CH539597A (de) | 1973-07-31 |
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