USB441543I5 - - Google Patents
Info
- Publication number
- USB441543I5 USB441543I5 US44154374A USB441543I5 US B441543 I5 USB441543 I5 US B441543I5 US 44154374 A US44154374 A US 44154374A US B441543 I5 USB441543 I5 US B441543I5
- Authority
- US
- United States
- 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.)
- Pending
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DT2307570 | 1973-02-16 | ||
| DE19732307570 DE2307570A1 (de) | 1973-02-16 | 1973-02-16 | Verfahren zur reinigung von pyromellithsaeuredianhydrid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| USB441543I5 true USB441543I5 (xx) | 1976-03-23 |
| US4014755A US4014755A (en) | 1977-03-29 |
Family
ID=5872049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/441,543 Expired - Lifetime US4014755A (en) | 1973-02-16 | 1974-02-11 | Method of refining pyromellitic acid dianhydride |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4014755A (xx) |
| JP (1) | JPS49102638A (xx) |
| BE (1) | BE810891A (xx) |
| DE (1) | DE2307570A1 (xx) |
| FR (1) | FR2218315B1 (xx) |
| GB (1) | GB1393867A (xx) |
| IT (1) | IT1002923B (xx) |
| NL (1) | NL7401916A (xx) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310790A (ja) * | 1986-03-17 | 1988-01-18 | Nippon Shokubai Kagaku Kogyo Co Ltd | 無水ピロメリツト酸の捕集方法 |
| JP2002069073A (ja) * | 2000-08-23 | 2002-03-08 | Mitsubishi Gas Chem Co Inc | 高純度無水ピロメリット酸の製造方法 |
| US6579990B2 (en) * | 2000-08-23 | 2003-06-17 | Mitsubishi Gas Chemical Company, Inc. | Process for producing refined pyromellitic acid and refined pyromellitic anhydride |
| CN100453544C (zh) * | 2005-09-14 | 2009-01-21 | 浙江大学 | 一种从混合气体中分离气相均苯四甲酸二酐的方法 |
-
1973
- 1973-02-16 DE DE19732307570 patent/DE2307570A1/de active Pending
-
1974
- 1974-02-11 US US05/441,543 patent/US4014755A/en not_active Expired - Lifetime
- 1974-02-11 FR FR7404479A patent/FR2218315B1/fr not_active Expired
- 1974-02-12 NL NL7401916A patent/NL7401916A/xx unknown
- 1974-02-12 BE BE140793A patent/BE810891A/xx unknown
- 1974-02-14 IT IT48349/74A patent/IT1002923B/it active
- 1974-02-14 GB GB686774A patent/GB1393867A/en not_active Expired
- 1974-02-15 JP JP49017742A patent/JPS49102638A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT1002923B (it) | 1976-05-20 |
| DE2307570A1 (de) | 1974-08-29 |
| BE810891A (fr) | 1974-05-29 |
| FR2218315B1 (xx) | 1977-09-16 |
| US4014755A (en) | 1977-03-29 |
| FR2218315A1 (xx) | 1974-09-13 |
| NL7401916A (xx) | 1974-08-20 |
| GB1393867A (en) | 1975-05-14 |
| JPS49102638A (xx) | 1974-09-27 |