GB372434A - Process for separation of acetic anhydride and acetic acid - Google Patents

Process for separation of acetic anhydride and acetic acid

Info

Publication number
GB372434A
GB372434A GB496631A GB496631A GB372434A GB 372434 A GB372434 A GB 372434A GB 496631 A GB496631 A GB 496631A GB 496631 A GB496631 A GB 496631A GB 372434 A GB372434 A GB 372434A
Authority
GB
United Kingdom
Prior art keywords
acetic acid
acetic
anhydride
acetate
mixture
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
GB496631A
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.)
C F Boehringer & Soehne GmbH
Roche Diagnostics GmbH
Original Assignee
C F Boehringer & Soehne GmbH
Boehringer Mannheim GmbH
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 C F Boehringer & Soehne GmbH, Boehringer Mannheim GmbH filed Critical C F Boehringer & Soehne GmbH
Priority to GB496631A priority Critical patent/GB372434A/en
Publication of GB372434A publication Critical patent/GB372434A/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)

Abstract

Acetic anhydride is separated from mixtures containing acetic acid with or without water by adding an acetate such as sodium acetate which combines with the acetic acid and water, forming a solid compound. The solid compound may be heated to distil off first the acetic acid and then water or the compound may be heated with a solvent such as benzene at 120-140 DEG C. under pressure, whereby the acetic acid is set free. The process may be effected in presence of an inert solvent such as benzene, toluene, xylene, ethyl acetate or sulphur dioxide. In examples, (1) and (2) a mixture of acetic anhydride and acetic acid and, if desired, cyclohexanol acetate, is shaken with sodium acetate and filtered; (3) a mixture of acetic anhydride, acetic acid, water and benzene is shaken with sodium acetate at 5 DEG C. and filtered, the acetate compound being heated as before; (4) a mixture of acetic anhydride, acetic acid and toluene is shaken with potassium acetate, and the mixture is distilled at a pressure of 80 mm. of mercury, the toluene and acetic anhydride distilling over; on raising the temperature to 120 DEG C. and reducing the pressure to 30 mm., acetic acid of 100 per cent distils off; if an acetic ester is used instead of toluene a similar result is obtained, but the ester distils before the anhydride, so that the anhydride is obtained by itself; (5) a mixture of acetic anhydride, acetic acid and toluene is placed in a flask attached to the bottom of a column containing sodium acetate mixed with glass rings and surrounded by a vapour-jacket at 80 DEG C.; the mixture is distilled at 80 mm. pressure when the anhydride and toluene distil over, and on reducing the pressure and raising the temperature, the acetic acid is obtained; (6) a mixture of acetic anhydride, acetic acid, and benzene is shaken with calcium acetate and filtered; the acetic acid is recovered by heating the acetate compound at 150-180 DEG C. Specifications 257,968 and 280,972, [both in Class 2 (iii), Dyes &c.], are referred to.
GB496631A 1931-02-17 1931-02-17 Process for separation of acetic anhydride and acetic acid Expired GB372434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB496631A GB372434A (en) 1931-02-17 1931-02-17 Process for separation of acetic anhydride and acetic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB496631A GB372434A (en) 1931-02-17 1931-02-17 Process for separation of acetic anhydride and acetic acid

Publications (1)

Publication Number Publication Date
GB372434A true GB372434A (en) 1932-05-12

Family

ID=9787240

Family Applications (1)

Application Number Title Priority Date Filing Date
GB496631A Expired GB372434A (en) 1931-02-17 1931-02-17 Process for separation of acetic anhydride and acetic acid

Country Status (1)

Country Link
GB (1) GB372434A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387713A (en) * 1991-01-05 1995-02-07 Bp Chemicals Limited Process for purification of carboxylic acids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387713A (en) * 1991-01-05 1995-02-07 Bp Chemicals Limited Process for purification of carboxylic acids

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