申请人:Texaco Chemical Co.
公开号:US04921969A1
公开(公告)日:1990-05-01
This invention discloses an improved method for preparation of imidazoles without isolation of the imidazoline intermediate which comprises reacting a diamine with carboxylic acid and heating the mixture at a temperature of 140.degree.-300.degree. C. at a pressure of subatmospheric to about 10 atm to form an amide, passing the amide over a nickel-containing catalyst at a temperature of 180.degree. C. to 250.degree. C. and a pressure of atmospheric to 200 psig and isolating the imidazole.
本发明揭示了一种改进的咪唑制备方法,该方法不需要分离咪唑啉中间体,包括将二胺与羧酸反应,并在温度为140℃至300℃,压力为亚大气压至10大气压的条件下加热混合物以形成酰胺,将酰胺经过含镍催化剂的催化剂床,在温度为180℃至250℃,压力为大气压至200 psig的条件下通过,然后分离咪唑。