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    • 29. 发明授权
    • Process for producing highly pure 2,6-dimethylnaphthalene
    • 生产高纯度2,6-二甲基萘的方法
    • US6072098A
    • 2000-06-06
    • US777077
    • 1996-12-30
    • Makoto TakagawaRyusuke Shigematsu
    • Makoto TakagawaRyusuke Shigematsu
    • C07C5/27C07C7/00C07C7/14C07C15/24C07C51/265C07C5/22
    • C07C7/14C07C15/24C07C5/2737C07C51/265C07C7/005C07C2529/18
    • There are disclosed an industrially advantageous process for efficiently producing highly pure 2,6-dimethylnaphthalene (DMN) in high yield from a mixture of DMN by carrying out in turn, the steps of isomerizing a mixture of DMN in the presence of a catalyst; crystallizing the isomerization reaction product in the presence of a solvent (e.g. an aliphatic or alicyclic saturated hydrocarbon) to precipitate 2,6-DMN crystal; isolating and recovering the 2,6-DMN thus precipitated; and distilling the mother liquor formed after the isolation of the crystal to obtain DMN fraction by removing the components having a higher boiling point than DMN and the components having a lower boiling point than DMN, while at least part of the DMN fraction is returned to the isomerization step and circulated through the process; a process for producing a 2,6-naphthalenedicarboxylic acid by subjecting the 2,6-DMN obtained by the above process to liquid-phase oxidation; and a process for producing 2,6-naphthalenedicarboxylic acid ester by esterifying 2,6-naphthalenedicarboxylic acid thus produced.
    • 公开了一种工业上有利的方法,通过在催化剂存在下进行DMN混合物的异构化步骤,从DMN的混合物中高效地生产高纯度的2,6-二甲基萘(DMN)。 在溶剂(例如脂族或脂环族饱和烃)存在下使异构化反应产物结晶以沉淀2,6-DMN晶体; 分离和回收由此沉淀的2,6-DMN; 并蒸馏出分离晶体后形成的母液,通过除去沸点比DMN高的组分和沸点低于DMN的组分,得到DMN馏分,而至少部分DMN馏分返回到 异构化步骤并通过该过程循环; 通过使通过上述方法获得的2,6-DMN进行液相氧化来制备2,6-萘二甲酸的方法; 以及通过酯化如此制备的2,6-萘二羧酸生产2,6-萘二甲酸酯的方法。