GB970491A - Production of aromatic carboxylic acids - Google Patents

Production of aromatic carboxylic acids

Info

Publication number
GB970491A
GB970491A GB3571460A GB3571460A GB970491A GB 970491 A GB970491 A GB 970491A GB 3571460 A GB3571460 A GB 3571460A GB 3571460 A GB3571460 A GB 3571460A GB 970491 A GB970491 A GB 970491A
Authority
GB
United Kingdom
Prior art keywords
solvent
zone
aqueous solvent
product
vapours
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
GB3571460A
Inventor
Richard Harold Baldwin
Charles Doucas Kalfadelis
Charles Albert Spiller
William Lees Bulkley
Sixt Frederick Kapff
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.)
Standard Oil Co
Original Assignee
Standard Oil 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 Standard Oil Co filed Critical Standard Oil Co
Priority to GB3571460A priority Critical patent/GB970491A/en
Publication of GB970491A publication Critical patent/GB970491A/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
    • 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
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for the production of aromatic carboxylic acids comprises catalytically oxidizing with molecular oxygen at an elevated temperature a substituted aromatic stock in the liquid phase in presence of a C2-8 aliphatic monocarboxylic acid as solvent, collecting a gaseous stream containing solvent vapours from the oxidation zone and condensing a part of them by cooling and returning the condensed part to said zone, recovering the remaining solvent (1) in the gaseous stream by scrubbing with water or aqueous solvent, withdrawing a product-containing liquid effluent from said zone and crystallizing product therefrom in a plurality of series-converted zones by removal of solvent vapours at successively lower temperatures and pressures, recovering an aqueous solvent stream (2) from such vapours, withdrawing a slurry of product crystals in mother liquor from the first crystallizing zone and separating crystals from mother liquor, fractionating the latter to recover aqueous solvent (3), combining the aqueous solvent streams (1), (2) and (3) and fractionating to obtain a dehydrated solvent stream which is used for washing the product crystals and/or charging to the oxidation zone. The process is stated to be particularly suitable for converting mixed xylenes or mixed toluic acids to mixed benzene dicarboxylic acids in such a form that they may be separated into substantially pure phthalic acid (or anhydride), isophthalic acid and terephthalic acid. The usual catalysts and promoters are mentioned. Specifications 807,091, 835,733, 970,492 and U.S.A. Specification 2,416,344 are referred to.
GB3571460A 1960-10-18 1960-10-18 Production of aromatic carboxylic acids Expired GB970491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3571460A GB970491A (en) 1960-10-18 1960-10-18 Production of aromatic carboxylic acids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3571460A GB970491A (en) 1960-10-18 1960-10-18 Production of aromatic carboxylic acids

Publications (1)

Publication Number Publication Date
GB970491A true GB970491A (en) 1964-09-23

Family

ID=10380769

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3571460A Expired GB970491A (en) 1960-10-18 1960-10-18 Production of aromatic carboxylic acids

Country Status (1)

Country Link
GB (1) GB970491A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498591A2 (en) * 1991-02-05 1992-08-12 Imperial Chemical Industries Plc Process for the production of terephthalic acid
EP0764626A1 (en) * 1995-09-21 1997-03-26 Intercontinental Quimica, S.A. (Interquisa) Process to manufacture aromatic carboxylic acids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498591A2 (en) * 1991-02-05 1992-08-12 Imperial Chemical Industries Plc Process for the production of terephthalic acid
EP0498591A3 (en) * 1991-02-05 1993-01-27 Imperial Chemical Industries Plc Process for the production of terephthalic acid
US5304676A (en) * 1991-02-05 1994-04-19 Imperial Chemical Industries Plc Process for the production of terephthalic acid
USRE36008E (en) * 1991-02-05 1998-12-22 E. I. Du Pont De Nemours And Company Process for the production of terephthalic acid
EP0764626A1 (en) * 1995-09-21 1997-03-26 Intercontinental Quimica, S.A. (Interquisa) Process to manufacture aromatic carboxylic acids

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