发明名称 |
Production of terephthalic acid |
摘要 |
Disclosed is a process for the continuous production of terephthalic acid from p-xylene, comprising the steps of oxidizing p-xylene in a first oxidation zone in the presence of not more than about 10 weight % of water and a cobalt/manganese catalyst up to a conversion of about 15% terephthalic acid; oxidizing the partially-oxidized compounds in a second oxidation zone in the presence of an additional amount of water up to about 20 to 70% by weight and in the presence of an additional amount of the catalyst up to a conversion of about 50% by weight terephthalic acid; stripping p-xylene vapors from the second oxidation zone; separating crystals of crude terephthalic acid from the effluent from the second oxidation zone from the soluble components of the effluent; countercurrently washing the separated crystals with fresh water to produce a slurry; recycling a part of soluble components to the second oxidation zone, and another part of the first oxidation zone to provide the latter with heavy metal catalyst; and recovering purified terephthalic acid by recyrstallizing the crystals contained in the slurry.
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申请公布号 |
US4334086(A) |
申请公布日期 |
1982.06.08 |
申请号 |
US19810244141 |
申请日期 |
1981.03.16 |
申请人 |
LABOFINA S.A. |
发明人 |
HANOTIER, JACQUES D. V.;HANOTIER-BRIDOUX, MONIQUE J. S. |
分类号 |
C07C63/26;B01J31/00;B01J31/04;C07B61/00;C07C51/00;C07C51/265;C07C51/43;C07C67/00;(IPC1-7):C07C51/16 |
主分类号 |
C07C63/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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