IT1075688B - Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor - Google Patents

Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor

Info

Publication number
IT1075688B
IT1075688B IT2205877A IT2205877A IT1075688B IT 1075688 B IT1075688 B IT 1075688B IT 2205877 A IT2205877 A IT 2205877A IT 2205877 A IT2205877 A IT 2205877A IT 1075688 B IT1075688 B IT 1075688B
Authority
IT
Italy
Prior art keywords
column
mother liquor
catalyst
acetic acid
water
Prior art date
Application number
IT2205877A
Other languages
Italian (it)
Inventor
Piero Bortesi
Sergio Tonti
Raffaele Tancorra
Original Assignee
Montedison Spa
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 Montedison Spa filed Critical Montedison Spa
Priority to IT2205877A priority Critical patent/IT1075688B/en
Priority to NLAANVRAGE7803368,A priority patent/NL188282C/en
Priority to FR7809488A priority patent/FR2386511A1/en
Priority to JP3817578A priority patent/JPS53127430A/en
Priority to IN356/CAL/78A priority patent/IN148106B/en
Priority to GB12977/78A priority patent/GB1593117A/en
Priority to SU782600750A priority patent/SU1217250A3/en
Priority to ES468499A priority patent/ES468499A1/en
Priority to BR7802069A priority patent/BR7802069A/en
Priority to CA300,300A priority patent/CA1113956A/en
Priority to MX172975A priority patent/MX148713A/en
Priority to DE19782814448 priority patent/DE2814448A1/en
Priority to BE186550A priority patent/BE865671A/en
Priority to BE188218A priority patent/BE867683R/en
Application granted granted Critical
Publication of IT1075688B publication Critical patent/IT1075688B/en

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
    • Y02P20/584—Recycling of catalysts

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)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

Terephthalic acid is formed by the oxidn. of paraxylene in an acetic acid soln. in the presence of a Mn, Co and Br based catalyst. The solid terephthalic acid is sepd. from the mother liquor, which is introduced into a distillation column, pref. above the level of the third plate. Condensed vapours formed mainly of acetic acid and water, from the oxidn. process, are also introduced into the distn. column. This column partially dries the mother liquor so tht the proportion of water in the acetic acid is less than 5% and pref less than 1%. Part of this partially dried m other liquor, which contains at least 50% of the catalyst in the untreated mother liquor, is recycled to the oxidation process. The remainder is discharged as a purge to classic sepn. treatments and catalyst regeneration. The stream of vapour enriched in water coming from the distillation column head is introduced into a second column. In this column distn. in the presence of an azeotropic entraining agent, pref. isobutyl acetate, takes place. The stream leaving the bottom of the second column contains at maximum 5% and pref. 3% water in the acetic acid, and is recycled to the oxidation process. Used for recovering the catalyst and solvent fro the mother liquor of a process of synthesis of terephthalic acid. The amount of water in the oxidation reactors is kept at a reasonable level and a satisfactory recovery of the acetic acid is obtd.
IT2205877A 1977-04-04 1977-04-04 Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor IT1075688B (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
IT2205877A IT1075688B (en) 1977-04-04 1977-04-04 Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor
NLAANVRAGE7803368,A NL188282C (en) 1977-04-04 1978-03-30 METHOD FOR THE SYNTHESIS OF TERPHALIC ACID BY OXYDERS OF P-XYLENE IN ACETIC ACID SOLUTION.
FR7809488A FR2386511A1 (en) 1977-04-04 1978-03-31 PROCESS FOR RECOVERING THE CATALYST AND THE SOLVENT FROM THE MOTHER LIQUEUR OF A PROCESS FOR SYNTHESIS OF TEREPHTHALIC ACID
IN356/CAL/78A IN148106B (en) 1977-04-04 1978-04-03
GB12977/78A GB1593117A (en) 1977-04-04 1978-04-03 Process for the recovery of catalyst and solvent from the mother lquor of a process for the synthesis of therephthalic acid
SU782600750A SU1217250A3 (en) 1977-04-04 1978-04-03 Method of treatment of mother solution
JP3817578A JPS53127430A (en) 1977-04-04 1978-04-03 Improved method of recovering catalyst and solvent from mother liquid of phthalic acid synthesizing process
ES468499A ES468499A1 (en) 1977-04-04 1978-04-03 Process for the recovery of catalyst and solvent from the mother lquor of a process for the synthesis of therephthalic acid
BR7802069A BR7802069A (en) 1977-04-04 1978-04-03 PROCESS FOR THE SYNTHESIS OF TEREFTALLIC ACID WITH CATALYST AND SOLVENT RECOVERY FROM THE MAIN LIQUID
CA300,300A CA1113956A (en) 1977-04-04 1978-04-03 Process for the recovery of catalyst and solvent from the mother liquor of a process for the synthesis of terephtalic acid
MX172975A MX148713A (en) 1977-04-04 1978-04-03 IMPROVED PROCEDURE FOR THE RECOVERY OF CATALYSTS AND SOLVENTS FROM A PROCESS FOR OBTAINING TEREFTALIC ACID
DE19782814448 DE2814448A1 (en) 1977-04-04 1978-04-04 IMPROVED PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID
BE186550A BE865671A (en) 1977-04-04 1978-04-04 PROCESS FOR RECOVERING THE CATALYST AND THE SOLVENT FROM THE MOTHER LIQUEUR OF A PROCESS FOR SYNTHESIS OF TEREPHTHALIC ACID
BE188218A BE867683R (en) 1977-04-04 1978-05-31 PROCESS FOR RECOVERING THE CATALYST AND THE SOLVENT FROM THE MOTHER LIQUEUR OF A PROCESS FOR SYNTHESIS OF TEREPHTHALIC ACID

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2205877A IT1075688B (en) 1977-04-04 1977-04-04 Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor

Publications (1)

Publication Number Publication Date
IT1075688B true IT1075688B (en) 1985-04-22

Family

ID=11190840

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2205877A IT1075688B (en) 1977-04-04 1977-04-04 Recovery of catalyst and solvent used in terephthalic acid mfr. - by distillation of the mother liquor

Country Status (3)

Country Link
BE (1) BE865671A (en)
CA (1) CA1113956A (en)
IT (1) IT1075688B (en)

Also Published As

Publication number Publication date
CA1113956A (en) 1981-12-08
BE865671A (en) 1978-10-04

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Legal Events

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TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19960415