GB955516A - Improvements in or relating to the preparation of dimethyl terephthalate - Google Patents

Improvements in or relating to the preparation of dimethyl terephthalate

Info

Publication number
GB955516A
GB955516A GB4595561A GB4595561A GB955516A GB 955516 A GB955516 A GB 955516A GB 4595561 A GB4595561 A GB 4595561A GB 4595561 A GB4595561 A GB 4595561A GB 955516 A GB955516 A GB 955516A
Authority
GB
United Kingdom
Prior art keywords
dimethyl terephthalate
copper
aldehyde
preparation
hydrogenation
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
GB4595561A
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.)
Toray Industries Inc
Original Assignee
Toyo Rayon Co Ltd
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 Toyo Rayon Co Ltd filed Critical Toyo Rayon Co Ltd
Publication of GB955516A publication Critical patent/GB955516A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/60—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/31—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of functional groups containing oxygen only in singly bound form
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/317—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups

Abstract

Purified dimethyl terephthalate is made by selectively reducing any aldehyde(s) present as impurity in crude dimethyl terephthalate or in the reaction mixture in which said dimethyl terephthalate is formed by hydrogenating the aldehyde(s) in the presence of a copper-chromium oxide or Raney copper catalyst, and rectifying the resulting reaction mixture to isolate the desired purified dimethyl terephthalate. The catalytic hydrogenation may be carried out after the formation of the crude dimethyl terephthalate or during its formation by esterification of terephthalic acid with methanol. The hydrogenation may take place under pressure at a temperature in the range from 150 DEG to 250 DEG C.ALSO:As catalyst for the selective hydrogenation of aldehyde impurities in dimethyl terephthalate, Example (1) describes the preparation of a copper-chromium oxide containing barium oxide, and in Example (5) Raney copper is made by treating Devarda's alloy (Al 50%, Cu 45%, Zn 5%) with sodium hydroxide solution.
GB4595561A 1960-12-28 1961-12-21 Improvements in or relating to the preparation of dimethyl terephthalate Expired GB955516A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5041460 1960-12-28
JP352561 1961-12-07

Publications (1)

Publication Number Publication Date
GB955516A true GB955516A (en) 1964-04-15

Family

ID=26337125

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4595561A Expired GB955516A (en) 1960-12-28 1961-12-21 Improvements in or relating to the preparation of dimethyl terephthalate

Country Status (1)

Country Link
GB (1) GB955516A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274110B (en) * 1965-05-14 1968-08-01 Sumitomo Chemical Co Process for the purification of crude bis-ª‰-hydroxyethyl terephthalate
US3855275A (en) * 1971-04-30 1974-12-17 Halcon International Inc Treatment of terephthalic acid reaction
US4076946A (en) * 1974-01-02 1978-02-28 Hercofina Hydrogenation of molten aldehydic dimethyl terephthalate
JPH04503358A (en) * 1989-02-16 1992-06-18 ヒュールス　アクチェンゲゼルシャフト A method for producing a DMT intermediate product of constant purity and a method for reprocessing the product into very pure DMT and/or medium to high purity terephthalic acid.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274110B (en) * 1965-05-14 1968-08-01 Sumitomo Chemical Co Process for the purification of crude bis-ª‰-hydroxyethyl terephthalate
US3855275A (en) * 1971-04-30 1974-12-17 Halcon International Inc Treatment of terephthalic acid reaction
US4076946A (en) * 1974-01-02 1978-02-28 Hercofina Hydrogenation of molten aldehydic dimethyl terephthalate
JPH04503358A (en) * 1989-02-16 1992-06-18 ヒュールス　アクチェンゲゼルシャフト A method for producing a DMT intermediate product of constant purity and a method for reprocessing the product into very pure DMT and/or medium to high purity terephthalic acid.
JP2793038B2 (en) 1989-02-16 1998-09-03 ヒュールス アクチェンゲゼルシャフト Process for producing a constant purity DMT intermediate and process for reworking the product to very pure DMT and / or medium to high purity terephthalic acid

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