JPS55133373A - Preparation of pyromellitic anhydride - Google Patents
Preparation of pyromellitic anhydrideInfo
- Publication number
- JPS55133373A JPS55133373A JP3983079A JP3983079A JPS55133373A JP S55133373 A JPS55133373 A JP S55133373A JP 3983079 A JP3983079 A JP 3983079A JP 3983079 A JP3983079 A JP 3983079A JP S55133373 A JPS55133373 A JP S55133373A
- Authority
- JP
- Japan
- Prior art keywords
- pyromellitic anhydride
- acid
- inert gas
- hot flow
- complex operations
- Prior art date
- 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.)
- Granted
Links
Abstract
PURPOSE: To obtain high-purity pyromellitic anhydride with ease useful as a raw material of a high-performance heat-resistant resin without requiring complex operations by heating an aromatic polyfunctional carboxylic acid or its acid ester in a hot flow of an inert gas.
CONSTITUTION: An aromatic polyfunctional carbixylic acid shown by the formula (R is H or 1W4C alkyl; n is 5 or 6; with the proviso that 5W6 R may be different) or its acid ester is heated in a hot flow of an inert gas, e.g., nitrogen, helium or argaon gas at 200W600°C to give high-purity pyromellitic anhydride. Sulfuric acid, a solvent which will be handled with very difficulty in the after-treatment is not used so that complex operations are not required.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3983079A JPS55133373A (en) | 1979-04-04 | 1979-04-04 | Preparation of pyromellitic anhydride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3983079A JPS55133373A (en) | 1979-04-04 | 1979-04-04 | Preparation of pyromellitic anhydride |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55133373A true JPS55133373A (en) | 1980-10-17 |
JPS6353193B2 JPS6353193B2 (en) | 1988-10-21 |
Family
ID=12563880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3983079A Granted JPS55133373A (en) | 1979-04-04 | 1979-04-04 | Preparation of pyromellitic anhydride |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55133373A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI781818B (en) * | 2021-11-05 | 2022-10-21 | 長春石油化學股份有限公司 | Surface-treated copper foil and copper clad laminate |
-
1979
- 1979-04-04 JP JP3983079A patent/JPS55133373A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6353193B2 (en) | 1988-10-21 |
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