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CH539597A - Process for the production of colorless pyromellitic acid - Google Patents

Process for the production of colorless pyromellitic acid

Info

Publication number
CH539597A
CH539597A CH467971A CH467971A CH539597A CH 539597 A CH539597 A CH 539597A CH 467971 A CH467971 A CH 467971A CH 467971 A CH467971 A CH 467971A CH 539597 A CH539597 A CH 539597A
Authority
CH
Switzerland
Prior art keywords
colorless
production
pyromellitic acid
pyromellitic
acid
Prior art date
Application number
CH467971A
Other languages
German (de)
Inventor
Neri Amleto
Roveri Fausto Dr Chem
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
Priority to CH467971A priority Critical patent/CH539597A/en
Priority to BE781730A priority patent/BE781730A/en
Priority to IT2348272A priority patent/IT959635B/en
Priority to FR7214715A priority patent/FR2134513A1/en
Publication of CH539597A publication Critical patent/CH539597A/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
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
CH467971A 1971-04-26 1971-04-26 Process for the production of colorless pyromellitic acid CH539597A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CH467971A CH539597A (en) 1971-04-26 1971-04-26 Process for the production of colorless pyromellitic acid
BE781730A BE781730A (en) 1971-04-26 1972-04-06 PYROMELLIC ACID MANUFACTURING PROCESS WITHOUT COLORATION
IT2348272A IT959635B (en) 1971-04-26 1972-04-22 PROCESS FOR MANUFACTURING COLORLESS PYROMELLITIC ACID
FR7214715A FR2134513A1 (en) 1971-04-26 1972-04-25 Colourless pyromellitic acid - by treating aqs soln of acid with activated charcoal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH467971A CH539597A (en) 1971-04-26 1971-04-26 Process for the production of colorless pyromellitic acid

Publications (1)

Publication Number Publication Date
CH539597A true CH539597A (en) 1973-07-31

Family

ID=4280583

Family Applications (1)

Application Number Title Priority Date Filing Date
CH467971A CH539597A (en) 1971-04-26 1971-04-26 Process for the production of colorless pyromellitic acid

Country Status (4)

Country Link
BE (1) BE781730A (en)
CH (1) CH539597A (en)
FR (1) FR2134513A1 (en)
IT (1) IT959635B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015988A1 (en) * 1980-04-25 1981-11-05 Akzo Gmbh, 5600 Wuppertal METHOD FOR PRODUCING OR PURIFICATION OF DI- AND POLYCARBONIC ACID ANHYDRIDES
US6579990B2 (en) 2000-08-23 2003-06-17 Mitsubishi Gas Chemical Company, Inc. Process for producing refined pyromellitic acid and refined pyromellitic anhydride
CN115504877B (en) * 2021-06-23 2025-08-26 中国石油化工股份有限公司 Method for purifying pyroxenic acid

Also Published As

Publication number Publication date
FR2134513A1 (en) 1972-12-08
FR2134513B1 (en) 1975-06-20
IT959635B (en) 1973-11-10
BE781730A (en) 1972-07-31

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Legal Events

Date Code Title Description
PL Patent ceased