NL7008514A - - Google Patents
Info
- Publication number
- NL7008514A NL7008514A NL7008514A NL7008514A NL7008514A NL 7008514 A NL7008514 A NL 7008514A NL 7008514 A NL7008514 A NL 7008514A NL 7008514 A NL7008514 A NL 7008514A NL 7008514 A NL7008514 A NL 7008514A
- Authority
- NL
- Netherlands
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
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/573—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691930011 DE1930011C3 (en) | 1969-06-13 | 1969-06-13 | Process for the purification of pyromellitic dianhydride obtained by gas phase oxidation of 1,2,4,5-tetraalkylated benzenes |
Publications (1)
Publication Number | Publication Date |
---|---|
NL7008514A true NL7008514A (en) | 1970-12-15 |
Family
ID=5736875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL7008514A NL7008514A (en) | 1969-06-13 | 1970-06-11 |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE751908A (en) |
DE (1) | DE1930011C3 (en) |
FR (1) | FR2052502A5 (en) |
GB (1) | GB1280562A (en) |
NL (1) | NL7008514A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI367884B (en) | 2005-07-21 | 2012-07-11 | Mitsubishi Gas Chemical Co | Production method of highly pure pyromellitic dianhydride |
CN102911181A (en) * | 2012-11-14 | 2013-02-06 | 曹永平 | Preparation method of high-purity pyromellitic dianhydride |
US9856269B2 (en) | 2013-09-02 | 2018-01-02 | L'Air Liquide, SociétéAnonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method for producing pyromellitic dianhydride, pyromellitic dianhydride produced by the method, and apparatus therefor |
CN113583016A (en) * | 2021-09-01 | 2021-11-02 | 潍坊弘润新材料有限公司 | Method for improving purity of crude pyromellitic dianhydride, device and application thereof |
CN114853775B (en) * | 2022-06-30 | 2023-05-30 | 江苏正丹化学工业股份有限公司 | Method for refining pyromellitic dianhydride |
-
1969
- 1969-06-13 DE DE19691930011 patent/DE1930011C3/en not_active Expired
-
1970
- 1970-06-11 NL NL7008514A patent/NL7008514A/xx not_active Application Discontinuation
- 1970-06-12 FR FR7021712A patent/FR2052502A5/fr not_active Expired
- 1970-06-12 BE BE751908D patent/BE751908A/en unknown
- 1970-06-12 GB GB2862370A patent/GB1280562A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE751908A (en) | 1970-11-16 |
DE1930011B2 (en) | 1978-10-26 |
FR2052502A5 (en) | 1971-04-09 |
DE1930011C3 (en) | 1979-08-09 |
DE1930011A1 (en) | 1970-12-23 |
GB1280562A (en) | 1972-07-05 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
BV | The patent application has lapsed |