Process for producing highly pure 3,3',4,4' - biphenyltetra- carboxylic acid or dianhydride thereof
申请人:HITACHI, LTD.
公开号:EP0421046A1
公开(公告)日:1991-04-10
Highly pure 3,3′,4,4′-biphenyltetracarboxylic acid (BPTA) and dianhydride thereof (BPDA) are produced by heating crude BPTA to give BPDA, treating the BPDA with hot water to give highly pure BPTA, and in the case of highly pure BPDA, heat treating the pure BPTA to give highly pure BPDA.
高纯度的 3,3′,4,4′-联苯四羧酸(BPTA)及其二酸酐(BPDA)是通过加热粗 BPTA 得到 BPDA,用热水处理 BPDA 得到高纯度的 BPTA,如果是高纯度的 BPDA,则对纯 BPTA 进行热处理得到高纯度的 BPDA。