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GB941903A - Process for the recovery of pure phthalic anhydride from the crude product obtained by the oxidation of o-xylene - Google Patents

Process for the recovery of pure phthalic anhydride from the crude product obtained by the oxidation of o-xylene

Info

Publication number
GB941903A
GB941903A GB4027961A GB4027961A GB941903A GB 941903 A GB941903 A GB 941903A GB 4027961 A GB4027961 A GB 4027961A GB 4027961 A GB4027961 A GB 4027961A GB 941903 A GB941903 A GB 941903A
Authority
GB
United Kingdom
Prior art keywords
phthalic anhydride
xylene
oxidation
recovery
crude product
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
GB4027961A
Inventor
Hubert Suter
Guenter Poehler
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.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik 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 BASF SE, Badische Anilin and Sodafabrik AG filed Critical BASF SE
Publication of GB941903A publication Critical patent/GB941903A/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
    • C07C51/573—Separation; Purification; Stabilisation; Use of additives

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Furan Compounds (AREA)

Abstract

Crude phthalic anhydride, obtained by the oxidation of o-xylene, is purified from maleic acid and water by distilling off 5 to 25% by weight of the crude material at a pressure of 20 to 200 mm. Hg and a still-temperature not exceeding 225 DEG C., and then distilling over pure phthalic anhydride at such a reduced pressure that the still-temperature does not exceed 200 DEG C. A tarry residue, comprising about 2 to 8% by weight of the crude material, remains behind as distillation-residue.
GB4027961A 1960-11-12 1961-11-10 Process for the recovery of pure phthalic anhydride from the crude product obtained by the oxidation of o-xylene Expired GB941903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB60066A DE1167810B (en) 1960-11-12 1960-11-12 Process for the production of pure phthalic anhydride

Publications (1)

Publication Number Publication Date
GB941903A true GB941903A (en) 1963-11-13

Family

ID=6972698

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4027961A Expired GB941903A (en) 1960-11-12 1961-11-10 Process for the recovery of pure phthalic anhydride from the crude product obtained by the oxidation of o-xylene

Country Status (2)

Country Link
DE (1) DE1167810B (en)
GB (1) GB941903A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295540B (en) * 1965-05-04 1969-05-22 Metallgesellschaft Ag Process for the production of the purest phthalic anhydride
DE1266748C2 (en) * 1966-05-21 1973-07-19 Basf Ag Process to prevent encrustation of heating surfaces during the continuous distillation of phthalic anhydride

Also Published As

Publication number Publication date
DE1167810B (en) 1964-04-16

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