申请人:Ogawa Hiroshi
公开号:US20050187403A1
公开(公告)日:2005-08-25
1,3-Naphthalenedicarboxylic acid is produced by oxidizing 1,3-dialkylnaphthalene in a liquid-phase with an oxygen-containing gas in the presence of a C
2
-C
6
lower aliphatic carboxylic acid solvent and a catalyst comprising a heavy metal and a bromine compound. By regulating the ratio of the total number of bromine atoms fed into a reaction system to the total number of 1,3-dialkylnaphthalene molecules fed into the reaction system within a specific range, 1,3-naphthalenedicarboxylic acid is efficiently produced with low costs. Using 1,3-dimethylnaphthalene, as the starting 1,3-dialkylnaphthalene, which is produced by isomerizing dimethylnaphthalenes in a liquid phase in the presence of a catalyst comprising hydrogen fluoride and boron trifluoride together with a C
5
-C
10
alicyclic saturated hydrocarbon having a five-membered or six-membered ring structure, a highly pure 1,3-naphthalenedicarboxylic acid is efficiently produced.
1,3-萘二甲酸是通过在液相中,在含氧气体的存在下,在C2-C6低级脂肪酸溶剂和重金属和溴化物催化剂的存在下氧化1,3-二烷基萘制成的。通过在特定范围内调节进入反应系统的总溴原子数与进入反应系统的总1,3-二烷基萘分子数的比例,以低成本高效地生产1,3-萘二甲酸。使用1,3-二甲基萘作为起始1,3-二烷基萘,通过在液相中,在氢氟酸和三氟化硼催化剂和具有五元环或六元环结构的C5-C10脂环饱和碳氢化合物的存在下异构化二甲基萘,高纯度的1,3-萘二甲酸被高效地制成。