GB770521A - Improvements in the production of benzene carboxylic acids - Google Patents

Improvements in the production of benzene carboxylic acids

Info

Publication number
GB770521A
GB770521A GB3498953A GB3498953A GB770521A GB 770521 A GB770521 A GB 770521A GB 3498953 A GB3498953 A GB 3498953A GB 3498953 A GB3498953 A GB 3498953A GB 770521 A GB770521 A GB 770521A
Authority
GB
United Kingdom
Prior art keywords
benzene
oxidation
compounds
carboxylic acids
hypochlorite
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
GB3498953A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3498953A priority Critical patent/GB770521A/en
Priority to DEC9592A priority patent/DE968484C/en
Priority to FR1105126D priority patent/FR1105126A/en
Priority to GB28175/54A priority patent/GB783286A/en
Priority to FR67795D priority patent/FR67795E/en
Priority to US512333A priority patent/US2999879A/en
Priority to GB29351/56A priority patent/GB816800A/en
Publication of GB770521A publication Critical patent/GB770521A/en
Priority to FR71531D priority patent/FR71531E/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
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/29—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with halogen-containing compounds which may be formed in situ

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

Benzene carboxylic acids are prepared from the corresponding benzene compounds with one to three alkyl side chains containing up to three carbon atoms in each side chain or the corresponding oxidation products thereof as fas as they are poorer in oxygen than the corresponding carboxylic acids by a treatment with an aqueous alkaline solution of a hypochlorite, which consists in working in the presence of an emulsifying agent. Benzene compounds specified are toluene, xylene, ethylbenzene, diethylbenzene, triethylbenzene, phenyl ethyl alcohol, phenyl acetaldehyde, acetophenone, p-diacetylbenzene and p-diisopropylbenzene. Crude mixtures obtainable by the oxidation of such compounds by air may also be used. Emulsifying agents mentioned are sulphonates of long-chain paraffin hydrocarbons or alkylated naphthalenes. In effecting the oxidation, liquid benzene compounds are emulsified in hypochlorite solution, or in aqueous alkali such as the hydroxides or carbonates of sodium or potassium or calcium hydroxide when chlorine is led into the emulsion. Solid benzene compounds are dissolved in a solvent such as benzene or cyclohexane before emulsification. The emulsion is vigorously mixed during the oxidation by stirring or acoustic irradiation. In examples, acetophenone (1), or a benzene solution of p-diacetylbenzene (2), is oxidized with sodium hypochlorite in aqueous caustic soda in the presence of a paraffin sulphonate prepated by sulphochlorination of high molecular weight paraffin hydrocarbons of the Fischer-Tropsch synthesis as emulsifier to yield benzoic acid or terephthalic acid respectively; (3) p-xylene, or (4) p-diisopropylbenzene, which has been subjected to a preliminary oxidation with air is emulsified in aqueous caustic soda in the presence of the emulsifier of Examples (1) and (2) and chlorine is then led in to give terephthalic acid.
GB3498953A 1953-12-16 1953-12-16 Improvements in the production of benzene carboxylic acids Expired GB770521A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB3498953A GB770521A (en) 1953-12-16 1953-12-16 Improvements in the production of benzene carboxylic acids
DEC9592A DE968484C (en) 1953-12-16 1954-07-02 Process for the production of aromatic carboxylic acids
FR1105126D FR1105126A (en) 1953-12-16 1954-07-22 Process for the preparation of aromatic carboxylic acids
GB28175/54A GB783286A (en) 1953-12-16 1954-09-30 Improvements in the production of benzene carboxylic acids
FR67795D FR67795E (en) 1953-12-16 1955-04-14 Process for the preparation of aromatic carboxylic acids
US512333A US2999879A (en) 1953-12-16 1955-05-31 Process for the production of aromatic carboxylic acids
GB29351/56A GB816800A (en) 1953-12-16 1956-09-26 Improvements in the production of benzene carboxylic acids
FR71531D FR71531E (en) 1953-12-16 1957-05-10 Process for the preparation of aromatic carboxylic acids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3498953A GB770521A (en) 1953-12-16 1953-12-16 Improvements in the production of benzene carboxylic acids

Publications (1)

Publication Number Publication Date
GB770521A true GB770521A (en) 1957-03-20

Family

ID=10372491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3498953A Expired GB770521A (en) 1953-12-16 1953-12-16 Improvements in the production of benzene carboxylic acids

Country Status (1)

Country Link
GB (1) GB770521A (en)

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