-
公开(公告)号:US5371304A
公开(公告)日:1994-12-06
申请号:US228871
申请日:1994-04-18
申请人: Sachio Asaoka , Tetsuo Maejima , Kouji Sakashita , Noriyuki Yoneda , Makoto Yasui , Nobuhiro Onda , Tsuneo Watanabe , Nobuo Moriya , Akio Shindo , Hiroaki Nishijima , Athumi Kukudome , Ryuichi Inaba , Takashi Imazeki , Karou Shimogawara
发明人: Sachio Asaoka , Tetsuo Maejima , Kouji Sakashita , Noriyuki Yoneda , Makoto Yasui , Nobuhiro Onda , Tsuneo Watanabe , Nobuo Moriya , Akio Shindo , Hiroaki Nishijima , Athumi Kukudome , Ryuichi Inaba , Takashi Imazeki , Karou Shimogawara
CPC分类号: C07C37/70 , C07C37/685 , C07C37/84
摘要: High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005% by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.
摘要翻译: 通过在最大氧含量为0.005体积%的气氛中将加合物熔合,然后蒸发释放的苯酚,由双酚A和苯酚的中性结晶加合物制备高品质双酚A。 结晶加合物可以在融合之前与脂族羧酸混合以减少产物的着色。 当使用酸性结晶加合物时,适合使用强酸性脂肪族羧酸碱金属盐。 用于进行熔化和蒸发的装置的内表面理想地用有机溶剂洗涤以从其中除去氧。 苯酚的蒸发适宜地通过两步蒸汽汽提进行,其中在第一阶段中使用在第一阶段中获得的使用的汽提气体作为第一阶段的汽提气体,同时在第二阶段使用蒸汽作为汽提气体。