ES401842A1 - Procedure for the dehydration of pyromelitic acid. (Machine-translation by Google Translate, not legally binding) - Google Patents

Procedure for the dehydration of pyromelitic acid. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES401842A1
ES401842A1 ES401842A ES401842A ES401842A1 ES 401842 A1 ES401842 A1 ES 401842A1 ES 401842 A ES401842 A ES 401842A ES 401842 A ES401842 A ES 401842A ES 401842 A1 ES401842 A1 ES 401842A1
Authority
ES
Spain
Prior art keywords
dehydration
translation
procedure
machine
legally binding
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.)
Expired
Application number
ES401842A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prolizenz AG
Original Assignee
Prolizenz 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 Prolizenz AG filed Critical Prolizenz AG
Publication of ES401842A1 publication Critical patent/ES401842A1/en
Expired legal-status Critical Current

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
    • C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation

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)

Abstract

Procedure for the dehydration of pyromellitic acid; characterized in that the pyromellitic acid is heated under pressure at temperatures between 100 and 300ºC in an inert organic combination which is liquid at reaction temperature and gives, together with water, an azeotropic mixture, the azeotropic mixture being separated by distillation until the formation of water vapor, the pyromellitic dianhydride is then obtained from the suspension. (Machine-translation by Google Translate, not legally binding)
ES401842A 1971-04-26 1972-04-17 Procedure for the dehydration of pyromelitic acid. (Machine-translation by Google Translate, not legally binding) Expired ES401842A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH525971A CH536265A (en) 1971-04-26 1971-04-26 Process for the dehydration of pyromellitic acid

Publications (1)

Publication Number Publication Date
ES401842A1 true ES401842A1 (en) 1975-03-01

Family

ID=4290601

Family Applications (1)

Application Number Title Priority Date Filing Date
ES401842A Expired ES401842A1 (en) 1971-04-26 1972-04-17 Procedure for the dehydration of pyromelitic acid. (Machine-translation by Google Translate, not legally binding)

Country Status (8)

Country Link
BE (1) BE781731A (en)
CH (1) CH536265A (en)
DE (1) DE2151239A1 (en)
ES (1) ES401842A1 (en)
FR (1) FR2134515A1 (en)
IT (1) IT954906B (en)
NL (1) NL7205521A (en)
ZA (1) ZA722811B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0676413B2 (en) * 1985-09-10 1994-09-28 三菱瓦斯化学株式会社 Method for producing pyromellitic dianhydride

Also Published As

Publication number Publication date
DE2151239A1 (en) 1972-11-09
IT954906B (en) 1973-09-15
ZA722811B (en) 1973-02-28
BE781731A (en) 1972-07-31
CH536265A (en) 1973-04-30
NL7205521A (en) 1972-10-30
FR2134515B1 (en) 1975-06-20
FR2134515A1 (en) 1972-12-08

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