GB1177430A - Preparation of aromatic polycarboxylic acids. - Google Patents

Preparation of aromatic polycarboxylic acids.

Info

Publication number
GB1177430A
GB1177430A GB34384/68A GB3438468A GB1177430A GB 1177430 A GB1177430 A GB 1177430A GB 34384/68 A GB34384/68 A GB 34384/68A GB 3438468 A GB3438468 A GB 3438468A GB 1177430 A GB1177430 A GB 1177430A
Authority
GB
United Kingdom
Prior art keywords
acid
acids
oxidation
polycarboxylic
xylene
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
GB34384/68A
Inventor
Donald Macdonald Lewis
Frederick James Sebelist
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to GB34384/68A priority Critical patent/GB1177430A/en
Publication of GB1177430A publication Critical patent/GB1177430A/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/582—Recycling of unreacted starting or intermediate materials

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

1,177,430. Polycarboxylic aromatic acids. E.I. DU PONT DE NEMOURS & CO. 18 July, 1968, No. 34384/68. Heading C2C. Polycarboxylic acids are prepared by oxidizing a polyalkyl-substituted aromatic compound with molecular oxygen in the liquid phase at elevated temperature and pressure and in the presence of an oxidation catalyst containing bromine and metal, the oxidation being carried out: (a) at a lower elevated temperature in the presence of little or no added water to convert a major proportion of the starting aromatic compound to an oxidation product comprising only a minor proportion of the desired polycarboxylic acid, and then (b) at a higher temperature, in the presence of sufficient water to maintain the solids content below 70% by weight to convert the oxidation product to the desired polycarboxylic acid. The second stage of the oxidation is carried out at a temperature, preferably at least 25‹ C. above that of the first. The process may be used for the conversion of p-ethyl toluene and/or p-diisopropyl benzene to terephthalic acid; o-xylene or o-isobutyl toluene to o-phthalic acid; m-xylene to isophthalic acid; ditolylethanes to phthalic acids; mesitylene to trimesic acid; pseudocumene to trimellitic acid durene to pyromellitic acid; dimethylnaphthalenes to dicarboxynaphthalenes and dimethylbiphenyls to biphenyldicarboxylic acids.
GB34384/68A 1968-07-18 1968-07-18 Preparation of aromatic polycarboxylic acids. Expired GB1177430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB34384/68A GB1177430A (en) 1968-07-18 1968-07-18 Preparation of aromatic polycarboxylic acids.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34384/68A GB1177430A (en) 1968-07-18 1968-07-18 Preparation of aromatic polycarboxylic acids.

Publications (1)

Publication Number Publication Date
GB1177430A true GB1177430A (en) 1970-01-14

Family

ID=10364987

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34384/68A Expired GB1177430A (en) 1968-07-18 1968-07-18 Preparation of aromatic polycarboxylic acids.

Country Status (1)

Country Link
GB (1) GB1177430A (en)

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