发明公开
EP0629605A2 Method for recovering dimethyl naphthalene-2,6-dicarboxylate
失效
Verfahren zur Gewinnung von二甲基萘-2,6-二羧酸酯。
- 专利标题： Method for recovering dimethyl naphthalene-2,6-dicarboxylate
- 专利标题（中）： Verfahren zur Gewinnung von二甲基萘-2,6-二羧酸酯。
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申请号： EP94304244.0申请日： 1994-06-13
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公开(公告)号： EP0629605A2公开(公告)日： 1994-12-21
- 发明人: Kuninobu, Yukio , Sumitani, Koji , Sato, Kazuhiro , Shono, Hisasi
- 申请人： TEIJIN LIMITED
- 申请人地址： 6-7, Minamihonmachi 1-chome Chuo-ku Osaka-shi Osaka 541 JP
- 专利权人： TEIJIN LIMITED
- 当前专利权人： TEIJIN LIMITED
- 当前专利权人地址： 6-7, Minamihonmachi 1-chome Chuo-ku Osaka-shi Osaka 541 JP
- 代理机构： Votier, Sidney David
- 优先权： JP144945/93 19930616
- 主分类号： C07C69/76
- IPC分类号： C07C69/76 ; C07C67/52 ; C07C67/03
摘要：
A method for recovering dimethyl naphthalene-2,6-dicarboxylate (DMN) from a mixture of dimethyl naphthalene-2,6-dicarboxylate (DMN) and dimethyl terephthalate (DMT), which comprises recrystallizing said mixture in a mixed medium of ethylene glycol and methanol, said mixed medium containing 10 to 60 % by weight of ethylene glycol, and separating precipitated dimethyl naphthalene-2,6-dicarboxylate (DMN).
According to this invention, DMN can be recovered with high yield from a mixture of DMN and DMT which is obtained from depolymerization of a mixed polymer of polyethylene-2,6-naphthalenedicarboxylate and polyethylene terephthalate.
According to this invention, DMN can be recovered with high yield from a mixture of DMN and DMT which is obtained from depolymerization of a mixed polymer of polyethylene-2,6-naphthalenedicarboxylate and polyethylene terephthalate.
公开/授权文献
- EP0629605B1 Method for recovering dimethyl naphthalene-2,6-dicarboxylate 公开/授权日：1998-01-14
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