FR2134513B1 - - Google Patents
Info
- Publication number
- FR2134513B1 FR2134513B1 FR7214715A FR7214715A FR2134513B1 FR 2134513 B1 FR2134513 B1 FR 2134513B1 FR 7214715 A FR7214715 A FR 7214715A FR 7214715 A FR7214715 A FR 7214715A FR 2134513 B1 FR2134513 B1 FR 2134513B1
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
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 (2)
Publication Number | Publication Date |
---|---|
FR2134513A1 FR2134513A1 (en) | 1972-12-08 |
FR2134513B1 true FR2134513B1 (it) | 1975-06-20 |
Family
ID=4280583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7214715A Granted FR2134513A1 (en) | 1971-04-26 | 1972-04-25 | Colourless pyromellitic acid - by treating aqs soln of acid with activated charcoal |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE781730A (it) |
CH (1) | CH539597A (it) |
FR (1) | FR2134513A1 (it) |
IT (1) | IT959635B (it) |
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 |
---|---|
IT959635B (it) | 1973-11-10 |
BE781730A (fr) | 1972-07-31 |
FR2134513A1 (en) | 1972-12-08 |
CH539597A (de) | 1973-07-31 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |