GB1282775A - Improvements in or relating to the preparation of terephthalic acid - Google Patents

Improvements in or relating to the preparation of terephthalic acid

Info

Publication number
GB1282775A
GB1282775A GB4275569A GB4275569A GB1282775A GB 1282775 A GB1282775 A GB 1282775A GB 4275569 A GB4275569 A GB 4275569A GB 4275569 A GB4275569 A GB 4275569A GB 1282775 A GB1282775 A GB 1282775A
Authority
GB
United Kingdom
Prior art keywords
toluic acid
tolualdehyde
per
reaction
acid
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
GB4275569A
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.)
Japan Gas Chemical Co Inc
Original Assignee
Japan Gas Chemical Co Inc
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
Priority claimed from JP43061119A external-priority patent/JPS4943925B1/ja
Application filed by Japan Gas Chemical Co Inc filed Critical Japan Gas Chemical Co Inc
Publication of GB1282775A publication Critical patent/GB1282775A/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

Abstract

1282775 Production of terephthalic acid JAPAN GAS CHEMICAL CO Inc 27 Aug 1969 [28 Aug 1968 (2)] 42755/69 Heading C2C Terephthalic acid is prepared by oxidizing p-toluic acid in the liquid phase with a gas containing free molecular oxygen in the presence of a catalytic amount of a cobalt salt, the reaction being carried out in the simultaneous presence of p-tolualdehyde and per-p-toluic acid, the p-tolualdehyde being added step-wise to the reaction mixture in quantities such that 0À1 to 0À5 g. thereof is always present per gram to p-toluic acid whereby sufficient per-p-toluic acid is produced from the p-tolualdehyde to maintain the cobalt ions of said salt in the trivalent state and, in turn prevent the p-tolualdehyde present from reducing the cobalt ions to the divalent state. In a preferred embodiment, the reaction in which the per-p-toluic acid is decomposed to liberate active oxygen and yield p-toluic acid which is used in the process of the invention, is coupled with a reaction requiring active oxygen, e.g. the oxidation of olefinic compounds and alicyclic ketones into epoxy compounds and lactones respectively.
GB4275569A 1968-08-28 1969-08-27 Improvements in or relating to the preparation of terephthalic acid Expired GB1282775A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP43061119A JPS4943925B1 (en) 1968-08-28 1968-08-28
JP6112068 1968-08-28

Publications (1)

Publication Number Publication Date
GB1282775A true GB1282775A (en) 1972-07-26

Family

ID=26402156

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4275569A Expired GB1282775A (en) 1968-08-28 1969-08-27 Improvements in or relating to the preparation of terephthalic acid

Country Status (2)

Country Link
DE (1) DE1943510A1 (en)
GB (1) GB1282775A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387699A (en) * 1993-02-25 1995-02-07 Industrie Gmbh Process for preparing pyromellitic dianhydride
WO2003008367A2 (en) * 2001-07-16 2003-01-30 Novartis Ag Process for the manufacture of aromatic carboxylic acids from aldehydes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525704A (en) * 1975-06-30 1977-01-17 Mitsubishi Gas Chem Co Inc Process for simultaneous preparation of p-toluic acid analkylene oxide

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387699A (en) * 1993-02-25 1995-02-07 Industrie Gmbh Process for preparing pyromellitic dianhydride
WO2003008367A2 (en) * 2001-07-16 2003-01-30 Novartis Ag Process for the manufacture of aromatic carboxylic acids from aldehydes
WO2003008367A3 (en) * 2001-07-16 2003-04-10 Novartis Ag Process for the manufacture of aromatic carboxylic acids from aldehydes
US6740776B2 (en) 2001-07-16 2004-05-25 Novartis Ag Air oxidation of an aromatic aldehyde to an aromatic acid

Also Published As

Publication number Publication date
DE1943510A1 (en) 1970-06-18

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee