GB833440A - Preparation of aromatic carboxylic acids - Google Patents

Preparation of aromatic carboxylic acids

Info

Publication number
GB833440A
GB833440A GB3320456A GB3320456A GB833440A GB 833440 A GB833440 A GB 833440A GB 3320456 A GB3320456 A GB 3320456A GB 3320456 A GB3320456 A GB 3320456A GB 833440 A GB833440 A GB 833440A
Authority
GB
United Kingdom
Prior art keywords
oxidation
preparation
acid
compounds
present
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
GB3320456A
Inventor
William Alexander O'neill
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB3320456A priority Critical patent/GB833440A/en
Publication of GB833440A publication Critical patent/GB833440A/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
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups

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  • 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

The invention comprises a process for the preparation of aromatic mono or dicarboxylic acids by oxidizing at elevated temperature aromatic compounds having one or two aliphatic nuclear substituents or intermediate oxidation products thereof or esters of the intermediate oxidation products, by means of oxygen or an oxygen containing gas in the conjoint presence of an oxidation metal catalyst and bromine wherein the oxidizable compounds or the products of oxidation melt at temperatures below that at which oxidation takes place, to act as the reaction medium and if desired the oxidation takes place in the additional presence of an inert diluent. Starting materials specified are toluene, cumene, ethyl benzene, acetophenone, benzyl alcohol, benzaldehyde, benzyl chloride, benzoin xylenes, toluic acids and methyl-p-toluate, or mixtures thereof. Anhydrides may also be present in the starting mixture, e.g. phthalic anhydride. Oxidation metal catalysts specified are oxides or salts of manganese or cobalt, e.g. bromides naphthenates or acetates. The required bromine may also be added for example as hydrogen, sodium, or organic bromide. Inert diluents such as o-dichlorobenzene or benzene may also be present and the reaction may be carried out at atmospheric or superatmospheric pressure. Examples are given of the preparation of benzoic acid, phthalic acid, terephthalic acid, isophthalic acid methyl hydrogen terephthalate and dimethyl terephthalate. Acetic acid is present in the reaction mixture in the case of the last two compounds. Specification 833,438 is referred to.
GB3320456A 1956-10-31 1956-10-31 Preparation of aromatic carboxylic acids Expired GB833440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3320456A GB833440A (en) 1956-10-31 1956-10-31 Preparation of aromatic carboxylic acids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3320456A GB833440A (en) 1956-10-31 1956-10-31 Preparation of aromatic carboxylic acids

Publications (1)

Publication Number Publication Date
GB833440A true GB833440A (en) 1960-04-27

Family

ID=10349917

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3320456A Expired GB833440A (en) 1956-10-31 1956-10-31 Preparation of aromatic carboxylic acids

Country Status (1)

Country Link
GB (1) GB833440A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187038A (en) * 1961-01-09 1965-06-01 Standard Oil Co Continuous oxidation process for production of benzoic acid
US3210416A (en) * 1960-09-22 1965-10-05 Standard Oil Co Manufacture of benzoic acid from toluene
EP0409437A2 (en) * 1989-07-20 1991-01-23 Kureha Kagaku Kogyo Kabushiki Kaisha Process for preparing aromatic polycarboxylic acids
WO2001058845A1 (en) * 2000-02-11 2001-08-16 Lonza S.P.A. Process for the preparation of aromatic carboxylic acids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210416A (en) * 1960-09-22 1965-10-05 Standard Oil Co Manufacture of benzoic acid from toluene
US3187038A (en) * 1961-01-09 1965-06-01 Standard Oil Co Continuous oxidation process for production of benzoic acid
EP0409437A2 (en) * 1989-07-20 1991-01-23 Kureha Kagaku Kogyo Kabushiki Kaisha Process for preparing aromatic polycarboxylic acids
EP0409437A3 (en) * 1989-07-20 1992-03-25 Kureha Kagaku Kogyo Kabushiki Kaisha Process for preparing aromatic polycarboxylic acids
WO2001058845A1 (en) * 2000-02-11 2001-08-16 Lonza S.P.A. Process for the preparation of aromatic carboxylic acids

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