申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US04900820A1
公开(公告)日:1990-02-13
A process for producing a cyclic diamine which comprises reacting a diamine of the formula R--HN--R'--NH--R (II) wherein R represents a lower alkyl group and R' represents a lower alkyl group-substituted dimethylene group, trimethylene group, a lower alkyl group-substituted trimethylene group, tetramethylene group or a lower alkyl group-substituted tetramethylene group with urea in the presence of a polar solvent and at 180.degree. C. or higher, to obtain a cyclic urea ##STR1## wherein R and R' are each as defined above, the production yield being more improved by carrying out the initial period reaction at 140.degree. C. or lower.
一种生产环状二胺的方法,包括在极性溶剂存在下,将式为R-HN-R'-NH-R (II)的二胺与尿素反应,其中R表示低碳基,R'表示低碳基取代的二亚甲基基团、三亚甲基基团、低碳基取代的三亚甲基基团、四亚甲基基团或低碳基取代的四亚甲基基团,并在180℃或更高的温度下反应,以获得环状脲##STR1##其中R和R'如上所定义,通过在140℃或更低的温度下进行初始反应期,可以进一步提高产量。