FR2145026A5 - Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying - Google Patents

Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying

Info

Publication number
FR2145026A5
FR2145026A5 FR7124767A FR7124767A FR2145026A5 FR 2145026 A5 FR2145026 A5 FR 2145026A5 FR 7124767 A FR7124767 A FR 7124767A FR 7124767 A FR7124767 A FR 7124767A FR 2145026 A5 FR2145026 A5 FR 2145026A5
Authority
FR
France
Prior art keywords
soln
terephthalic acid
hydrogenating
acidifying
terephthalate
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
FR7124767A
Other languages
French (fr)
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Priority to FR7124767A priority Critical patent/FR2145026A5/en
Application granted granted Critical
Publication of FR2145026A5 publication Critical patent/FR2145026A5/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
    • C07C51/02—Preparation of carboxylic acids or their salts, halides or anhydrides from salts of carboxylic acids
    • 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
    • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification

Abstract

Terephthalic acid is purified by (a) dissolving it at 20-200, pref. 80-180 degrees C in aq. ammonia in stoichiometric excess of 0.100% pref. 1-10% to form ammonium terephthalate soln. of pH 7.5-11, pref. 8-9, (b) treating the soln. with H2 (partial press. 1-200 atm) using hydrogenation catalyst at 130-230, pref. 150-180 degrees C, and (c) converting the ammonium terephthalate to the free acid by contact with H2SO4. Ammonium, terephthalate is more soluble than the acid and concn. of soln. can be increased from 10 to 30%. The product is suitable for polyester prepn.
FR7124767A 1971-07-06 1971-07-06 Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying Expired FR2145026A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7124767A FR2145026A5 (en) 1971-07-06 1971-07-06 Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7124767A FR2145026A5 (en) 1971-07-06 1971-07-06 Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying

Publications (1)

Publication Number Publication Date
FR2145026A5 true FR2145026A5 (en) 1973-02-16

Family

ID=9079935

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7124767A Expired FR2145026A5 (en) 1971-07-06 1971-07-06 Pure terephthalic acid prodn - by hydrogenating ammonium terephthalate soln and acidifying

Country Status (1)

Country Link
FR (1) FR2145026A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924665A1 (en) * 1979-06-19 1981-01-08 Mitsubishi Gas Chemical Co Terephthalic acid purificn. - by dissolving in water and then hydrogenating and recrystallising in presence of alkaline material
FR2459220A1 (en) * 1979-06-21 1981-01-09 Mitsubishi Gas Chemical Co Terephthalic acid purificn. - by dissolving in water and then hydrogenating and recrystallising in presence of alkaline material
WO2007094936A1 (en) * 2006-02-14 2007-08-23 Eastman Chemical Company Process for decolorizing aromatic dicarboxylic acids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924665A1 (en) * 1979-06-19 1981-01-08 Mitsubishi Gas Chemical Co Terephthalic acid purificn. - by dissolving in water and then hydrogenating and recrystallising in presence of alkaline material
DE2924665B2 (en) * 1979-06-19 1981-08-06 Mitsubishi Gas Chemical Co., Inc., Tokyo Process for purifying terephthalic acid
DE2924665C3 (en) * 1979-06-19 1982-05-19 Mitsubishi Gas Chemical Co., Inc., Tokyo Process for purifying terephthalic acid
FR2459220A1 (en) * 1979-06-21 1981-01-09 Mitsubishi Gas Chemical Co Terephthalic acid purificn. - by dissolving in water and then hydrogenating and recrystallising in presence of alkaline material
WO2007094936A1 (en) * 2006-02-14 2007-08-23 Eastman Chemical Company Process for decolorizing aromatic dicarboxylic acids

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Legal Events

Date Code Title Description
ST Notification of lapse