申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0411817A2
公开(公告)日:1991-02-06
A process for preparing an N-alkyl-substituted aminophenol comprises continuously feeding an aldehyde or a ketone to a reaction system containing an organic solvent, e.g., methanol or ethanol, a catalyst for reduction (e.g., Pt or Pd), hydrogen, and an aminophenol to conduct a reductive alkylation reaction, wherein said reductive alkylation reaction is carried our while continuously adding an organic carboxylic acid (e.g. a mono or di-carboxylic or hydroxycarboxylic acid of up to 8 carbon atoms), in amount of 0.05 to 5 wt % of the aminophenol, diluted with said solvent. The aldehyde or ketone can first be added to the system apart from the acid, which is added continuously when hydrogen absorption has begun.
The process attains a high yield even when the catalyst is repeatedly reused, and does not cause corrosion of equipment.
一种制备 N-烷基取代氨基苯酚的工艺包括:向含有有机溶剂(如甲醇或乙醇)、还原催化剂(如铂或钯)、氢和氨基苯酚的反应体系中连续加入醛或酮,以进行还原烷基化反应、其中,在进行还原烷基化反应的同时,不断加入用所述溶剂稀释的有机羧酸(例如,碳原子数不超过 8 的单羧酸或二羧酸或羟基羧酸),其用量为氨基苯酚的 0.05 至 5 wt %。醛或酮可以先与酸分开加入体系中,当开始吸氢时再继续加入。
即使催化剂重复使用,该工艺也能达到很高的产量,而且不会对设备造成腐蚀。