This invention relates to a process for producing ring alkylated aromatic amines. In the process an aromatic amine is reacted with an olefin using gamma alumina as a catalyst. Under the conditions of the process the catalyst is extremely active and with amines that are capable of alkylation at the ortho and para positions, high selectivity to the ortho alkylated isomer can be achieved.
The catalyst is also effective for producing unsymmetrical disubstituted alkyl aromatic amines, e.g., ethyl or propyl toluidine where one ortho position is substituted with a methyl group and the other substituted with an ethyl or propyl group.
本发明涉及一种生产环烷基化芳香胺的工艺。在该工艺中,以γ氧化铝为催化剂,芳香胺与烯烃发生反应。在该工艺的条件下,催化剂的活性极高,对于能够在正位和对位发生烷基化反应的胺,可以实现对正位烷基化异构体的高选择性。
该催化剂对生产非对称二取代烷基芳香胺也很有效,例如,乙基或丙基甲
苯胺,其中一个正位被甲基取代,另一个正位被乙基或丙基取代。