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公开(公告)号:US5420344A
公开(公告)日:1995-05-30
申请号:US134907
申请日:1993-10-13
申请人: Yoshiaki Izumisawa , Tsukasa Kawahara , Yoshiyuki Sumi , Takehiko Baba , Yoshio Ishinaga , Katsuhiko Fukui , Hironori Ohgi
发明人: Yoshiaki Izumisawa , Tsukasa Kawahara , Yoshiyuki Sumi , Takehiko Baba , Yoshio Ishinaga , Katsuhiko Fukui , Hironori Ohgi
IPC分类号: C07C51/487 , C07C51/42
CPC分类号: C07C51/487
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.
摘要翻译: 一种生产高纯度对苯二甲酸的方法,其包括将粗对苯二甲酸加热并溶解在水中,并通过在铂族金属存在下在260℃至320℃的温度下将该水溶液与氢气接触来进行纯化 催化剂,其中在加热水溶液达到250℃的温度后三分钟内开始纯化。