GB797797A - Process for recovering pure isophthalic and terephthalic acid - Google Patents

Process for recovering pure isophthalic and terephthalic acid

Info

Publication number
GB797797A
GB797797A GB2266/57A GB226657A GB797797A GB 797797 A GB797797 A GB 797797A GB 2266/57 A GB2266/57 A GB 2266/57A GB 226657 A GB226657 A GB 226657A GB 797797 A GB797797 A GB 797797A
Authority
GB
United Kingdom
Prior art keywords
solvent
terephthalic
isophthalic
terephthalic acid
heating
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
GB2266/57A
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.)
Olin Corp
Original Assignee
Olin Corp
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 Olin Corp filed Critical Olin Corp
Publication of GB797797A publication Critical patent/GB797797A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/14—Monocyclic dicarboxylic acids
    • C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
    • C07C63/26—1,4 - Benzenedicarboxylic acid
    • 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
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/04—Monocyclic monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/14—Monocyclic dicarboxylic acids
    • C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
    • C07C63/24—1,3 - Benzenedicarboxylic acid

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

Terephthalic and isophthalic acids are separately recovered from mixtures containing them and organic impurities by heating the mixture with an ether or ketone solvent, in which isophthalic acid is at least five times as soluble as terephthalic acid, so that the isophthalic acid and organic impurities dissolve in the solvent, recovering the substantially pure residual terephthalic acid from the solvent, and crystallizing out substantially pure isophthalic acid from the filtrate. The solvent is preferably capable of dissolving at least one per cent isophthalic acid, and diethyl ether, ethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, dioxan, tetrahydrofuran, 2 : 3-dihydro-2-formyl-1 : 4-pyran, acetone, pentane-2 : 4-dione, or cyclohexanone may be used. The process may be worked by heating the mixture with the solvent to a temperature at least within 50 DEG C. of the boiling point of the solvent. In examples, mixtures of terephthalic and isophthalic acids are separated by heating with (1), (2), (3) dioxan, (4) diethylene glycol diethyl ether, (5) tetrahydrofuran and (6) acetone; (7) a mixture obtained from the oxidation of xylenes is extracted with cyclohexanone and terephthalic acid obtained from the residue.
GB2266/57A 1956-04-11 1957-01-22 Process for recovering pure isophthalic and terephthalic acid Expired GB797797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US797797XA 1956-04-11 1956-04-11

Publications (1)

Publication Number Publication Date
GB797797A true GB797797A (en) 1958-07-09

Family

ID=22152762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2266/57A Expired GB797797A (en) 1956-04-11 1957-01-22 Process for recovering pure isophthalic and terephthalic acid

Country Status (1)

Country Link
GB (1) GB797797A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112059B (en) * 1960-01-30 1961-08-03 Basf Ag Process for the purification of crude terephthalic acid
CN112608230A (en) * 2020-11-17 2021-04-06 银金达(上海)新材料有限公司 Low-metal-ion PETG material and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112059B (en) * 1960-01-30 1961-08-03 Basf Ag Process for the purification of crude terephthalic acid
CN112608230A (en) * 2020-11-17 2021-04-06 银金达(上海)新材料有限公司 Low-metal-ion PETG material and application thereof

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