BE751908A - PROCESS FOR THE PURIFICATION OF THE ANHYDRIDE OF PYROMELLIC ACID OBTAINED BY OXIDATION IN THE GASEOUS PHASE OF BENZENES 1,2,4,5-TETRAALCOYLES - Google Patents

PROCESS FOR THE PURIFICATION OF THE ANHYDRIDE OF PYROMELLIC ACID OBTAINED BY OXIDATION IN THE GASEOUS PHASE OF BENZENES 1,2,4,5-TETRAALCOYLES

Info

Publication number
BE751908A
BE751908A BE751908DA BE751908A BE 751908 A BE751908 A BE 751908A BE 751908D A BE751908D A BE 751908DA BE 751908 A BE751908 A BE 751908A
Authority
BE
Belgium
Prior art keywords
tetraalcoyles
benzenes
anhydride
purification
oxidation
Prior art date
Application number
Other languages
French (fr)
Original Assignee
Veba Chemie Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Veba Chemie Ag filed Critical Veba Chemie Ag
Publication of BE751908A publication Critical patent/BE751908A/en

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)
BE751908D 1969-06-13 1970-06-12 PROCESS FOR THE PURIFICATION OF THE ANHYDRIDE OF PYROMELLIC ACID OBTAINED BY OXIDATION IN THE GASEOUS PHASE OF BENZENES 1,2,4,5-TETRAALCOYLES BE751908A (en)

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
BE751908A true BE751908A (en) 1970-11-16

Family

ID=5736875

Family Applications (1)

Application Number Title Priority Date Filing Date
BE751908D BE751908A (en) 1969-06-13 1970-06-12 PROCESS FOR THE PURIFICATION OF THE ANHYDRIDE OF PYROMELLIC ACID OBTAINED BY OXIDATION IN THE GASEOUS PHASE OF BENZENES 1,2,4,5-TETRAALCOYLES

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006010626D1 (en) 2005-07-21 2010-01-07 Mitsubishi Gas Chemical Co Process for the preparation of high purity pyromellitic dianhydride
CN102911181A (en) * 2012-11-14 2013-02-06 曹永平 Preparation method of high-purity pyromellitic dianhydride
KR102268481B1 (en) * 2013-09-02 2021-06-22 레르 리키드 쏘시에떼 아노님 뿌르 레드 에렉스뿔라따시옹 데 프로세데 조르즈 클로드 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

Also Published As

Publication number Publication date
DE1930011B2 (en) 1978-10-26
FR2052502A5 (en) 1971-04-09
DE1930011C3 (en) 1979-08-09
DE1930011A1 (en) 1970-12-23
NL7008514A (en) 1970-12-15
GB1280562A (en) 1972-07-05

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