GB307343A - Improvements in the manufacture and production of pure benzoic acid - Google Patents

Improvements in the manufacture and production of pure benzoic acid

Info

Publication number
GB307343A
GB307343A GB5374/29A GB537429A GB307343A GB 307343 A GB307343 A GB 307343A GB 5374/29 A GB5374/29 A GB 5374/29A GB 537429 A GB537429 A GB 537429A GB 307343 A GB307343 A GB 307343A
Authority
GB
United Kingdom
Prior art keywords
benzoic acid
water
phthalic anhydride
acid
phthalic
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
GB5374/29A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB307343A publication Critical patent/GB307343A/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
    • C07C51/487—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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

307,343. I. G. Farbenindustrie Akt.- Ges. March 5, 1928, [Convention date]. Benzoic acid.-Benzoic acid prepared catalytically from phthalic acid or phthalic anhydride, or from naphthalene by way of phthalic anhydride, is purified by treating it with reducing agents in the presence of water, whereby the naphthoquinone impurities are reduced to naphthohydroquinones while the phthalic anhydride, if present, is hyarated; the product is then leached with water to remove the naphthohydroquinones and the phthalic acid. According to the example, crude, finely ground benzoic acid pasted with water is treated with sodium bisulphite at 40- 50‹ C., and after 3 to 4 hours the mass is acidified with hydrochloric acid, cooled, filtered, and washed with water; substantially pure benzoic acid is obtained. Sulphur dioxide may he used instead of sodium bisulphite. The Specification as open to inspection under Sect. 91 (3) (a) states that the hydration of the phthalic anhydride may take place prior or subsequently to the reduction of the naphthoquinones. It states also that the product may be leached with aqueous solutions. This subject-matter does not appear in the Specification as accepted.
GB5374/29A 1928-03-05 1929-02-18 Improvements in the manufacture and production of pure benzoic acid Expired GB307343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE307343X 1928-03-05

Publications (1)

Publication Number Publication Date
GB307343A true GB307343A (en) 1930-03-27

Family

ID=6121377

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5374/29A Expired GB307343A (en) 1928-03-05 1929-02-18 Improvements in the manufacture and production of pure benzoic acid

Country Status (1)

Country Link
GB (1) GB307343A (en)

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