GB447756A - Improvements relating to the production of acid anhydrides - Google Patents

Improvements relating to the production of acid anhydrides

Info

Publication number
GB447756A
GB447756A GB33243/34A GB3324334A GB447756A GB 447756 A GB447756 A GB 447756A GB 33243/34 A GB33243/34 A GB 33243/34A GB 3324334 A GB3324334 A GB 3324334A GB 447756 A GB447756 A GB 447756A
Authority
GB
United Kingdom
Prior art keywords
production
anhydrides
ester
acid
propionic
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
GB33243/34A
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Deutsche Gold und Silber Scheideanstalt
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 Degussa GmbH, Deutsche Gold und Silber Scheideanstalt filed Critical Degussa GmbH
Publication of GB447756A publication Critical patent/GB447756A/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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Aliphatic anhydrides are produced by heating an acid containing three or more carbon atoms or its ester with acetic anhydride and continuously removing the acetic acid or its ester by distillation. A catalyst such as sulphuric, hydrochloric or phosphoric acid or zinc chloride may be used. Examples describe the production of propionic, butyric and caproic anhydrides respectively; in the last case the operation is effected under reduced pressure. The production of propionic anhydride from ethyl propionate is also mentioned. The Specification as open to inspection under Sect. 91 includes the production of anhydrides of organic acids in general, and is not limited to the continuous removal of the acetic acid. This subject-matter does not appear in the Specification as accepted.
GB33243/34A 1933-11-17 1934-11-19 Improvements relating to the production of acid anhydrides Expired GB447756A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE447756X 1933-11-17

Publications (1)

Publication Number Publication Date
GB447756A true GB447756A (en) 1936-05-19

Family

ID=6538049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33243/34A Expired GB447756A (en) 1933-11-17 1934-11-19 Improvements relating to the production of acid anhydrides

Country Status (1)

Country Link
GB (1) GB447756A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387705A (en) * 1993-08-13 1995-02-07 The Procter & Gamble Company Fatty acid anhydride process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387705A (en) * 1993-08-13 1995-02-07 The Procter & Gamble Company Fatty acid anhydride process

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