ES401989A1 - Procedure for the manufacture of pure piromelitic dianhydride. (Machine-translation by Google Translate, not legally binding) - Google Patents

Procedure for the manufacture of pure piromelitic dianhydride. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES401989A1
ES401989A1 ES401989A ES401989A ES401989A1 ES 401989 A1 ES401989 A1 ES 401989A1 ES 401989 A ES401989 A ES 401989A ES 401989 A ES401989 A ES 401989A ES 401989 A1 ES401989 A1 ES 401989A1
Authority
ES
Spain
Prior art keywords
dianhydride
translation
manufacture
pure
machine
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
ES401989A
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 ES401989A1 publication Critical patent/ES401989A1/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
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • 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)
  • Crystallography & Structural Chemistry (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

Abstract

Process for the manufacture of pure pyromellitic dianhydride; by catalytic oxidation of 1,2,4,5-tetraalkylbenzene in the gas phase, characterized in that the pyromellitic dianhydride in the reactant gases is transformed into pyromellitic acid and this is purified by separation by crystallization of an aqueous and dehydrated solution to form dianhydride. (Machine-translation by Google Translate, not legally binding)
ES401989A 1971-04-26 1972-04-21 Procedure for the manufacture of pure piromelitic dianhydride. (Machine-translation by Google Translate, not legally binding) Expired ES401989A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH525871A CH540217A (en) 1971-04-26 1971-04-26 Process for the production of pure pyromellitic dianhydride

Publications (1)

Publication Number Publication Date
ES401989A1 true ES401989A1 (en) 1975-03-01

Family

ID=4290581

Family Applications (1)

Application Number Title Priority Date Filing Date
ES401989A Expired ES401989A1 (en) 1971-04-26 1972-04-21 Procedure for the manufacture of pure piromelitic dianhydride. (Machine-translation by Google Translate, not legally binding)

Country Status (8)

Country Link
BE (1) BE781732A (en)
CH (1) CH540217A (en)
DE (1) DE2151238A1 (en)
ES (1) ES401989A1 (en)
FR (1) FR2134514A1 (en)
IT (1) IT953752B (en)
NL (1) NL7205522A (en)
ZA (1) ZA722810B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6579990B2 (en) 2000-08-23 2003-06-17 Mitsubishi Gas Chemical Company, Inc. Process for producing refined pyromellitic acid and refined pyromellitic anhydride

Also Published As

Publication number Publication date
FR2134514B1 (en) 1975-06-20
BE781732A (en) 1972-07-31
CH540217A (en) 1973-08-15
DE2151238A1 (en) 1972-12-21
FR2134514A1 (en) 1972-12-08
IT953752B (en) 1973-08-10
ZA722810B (en) 1973-02-28
NL7205522A (en) 1972-10-30

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