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
Application number
NL7008514A
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 filed Critical
Publication of NL7008514A publication Critical patent/NL7008514A/xx

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)
NL7008514A 1969-06-13 1970-06-11 NL7008514A (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
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)

* Cited by examiner, † Cited by third party
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

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

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Legal Events

Date Code Title Description
BV The patent application has lapsed