Oxygen → Dimethyl terephthalate

HRID 236046

반응식

HRID 236046 반응식
[C:1]([O:13][CH3:14])(=[O:12])[C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[CH:4][CH:3]=1.O=O.C1(C)C=CC(C(OC)=O)=CC=1.CC1C=CC(C(O)=O)=CC=1.C(OC)(=O)C1C=CC(C([O-])=O)=CC=1>CO.CC1C=CC(C)=CC=1>[C:2]1([CH3:1])[CH:11]=[CH:10][C:5]([C:6]([O-:8])=[O:7])=[CH:4][CH:3]=1.[C:6]([O:8][CH3:9])(=[O:7])[C:5]1[CH:10]=[CH:11][C:2]([C:1]([O:13][CH3:14])=[O:12])=[CH:3][CH:4]=1

참가 물질

9

반응물 5

HCID 977OxygenHCID 7455Methyl 4-methylbenzoateHCID 7470P-Toluic AcidHCID 8441Dimethyl terephthalateHCID 36144541,4-Benzenedicarboxylic acid, methyl ester

생성물 2

HCID 8441Dimethyl terephthalateHCID 1543424-Methylbenzoate

시약·촉매·용매 2

HCID 887Methanol용매2회HCID 7809P-Xylene용매2회

실험 절차

A process for the production of dimethyl terephthalate from p-xylene and methanol by oxidation in a reactor, in the liquid phase with atmospheric oxygen in the presence of dissolved heavy metal compounds as a catalyst, of a mixture of p-xylene and a fraction containing predominantly methyl p-toluate, which fraction is recycled into the oxidation, to obtain an oxidation product containing primarily p-toluic acid and monomethyl terephthalate, at a temperature of 140°-170° C. and under a pressure of 4-8 bar; by esterification of the oxidation product with liquid and subseqently vaporized methanol brought to an elevated pressure, at a temperature of 220-280° C. and under a pressure of 20-25 bar in a reactor to obtain a raw ester containing primarily p-toluate and dimethyl terephthalate; by withdrawing the raw ester fraction and a methanol-containing vapor fraction from the esterification stage; and by distillatory separation of the raw ester into a p-toluate fraction which is recycled into the oxidation, a raw dimethyl terephthalate fraction which is subjected to further processing by recrystallization in methanol, and a residual fraction which is subjected to a thermal aftertreatment or a reactive treatment with methanol and is partially recycled into the process after a subsequent working-up step by distillation, characterized in that the esterification of the oxidation product is conducted with a methanol-containing vapor, brought by compression to elevated pressure and elevated temperature, which methanol-containing vapor has been obtained from the filtrate of the recrystallization of the raw dimethyl terephthalate fraction by vaporization or also by rectification of the methanol-containing vapor fraction and optionally additional methanol-containing process streams, under a pressure lying below the pressure utilized in the esterification reactor.

후처리

  1. customto obtain an oxidation product
  2. customat a temperature of 140°-170° C.

출처 및 근거

ORD 기록
ord-5d6cee195bb3429f909e68f7fb1f9d4f
출처 데이터셋
uspto-grants-1987_02
특허 번호
US04642369

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