发明授权
- 专利标题： Process for producing highly pure terephthalic acid
- 专利标题（中）： 高纯度对苯二甲酸生产方法
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申请号： US134907申请日： 1993-10-13
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公开(公告)号： US5420344A公开(公告)日： 1995-05-30
- 发明人: Yoshiaki Izumisawa , Tsukasa Kawahara , Yoshiyuki Sumi , Takehiko Baba , Yoshio Ishinaga , Katsuhiko Fukui , Hironori Ohgi
- 申请人： Yoshiaki Izumisawa , Tsukasa Kawahara , Yoshiyuki Sumi , Takehiko Baba , Yoshio Ishinaga , Katsuhiko Fukui , Hironori Ohgi
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Chemical Corporation
- 当前专利权人： Mitsubishi Chemical Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX4-274571 19921013; JPX5-091552 19930419
- 主分类号： C07C51/487
- IPC分类号： C07C51/487 ; C07C51/42
摘要：
A process for producing highly pure terephthalic acid, which comprises heating and dissolving crude terephthalic acid in water, and purifying it by contacting the aqueous solution with hydrogen at a temperature of from 260.degree. to 320.degree. C. in the presence of a platinum group metal catalyst, wherein the purification is initiated within three minutes after the aqueous solution under heating reaches a temperature of 250.degree. C.