| 摘要 |
<p>The present invention relates to a process for preparing aliphatic amines wherein the aliphatic amines are obtained by continuous addition of ammonia to alkenes having 2 to 8 carbon atoms in the presence of a heterogeneous or homogeneous catalyst at a pressure of 2 to 8 MPa, a temperature ranging from 220 to 320 degC and a molar ratio of ammonia to the alkene of 1.5 to 20, whereas the gaseous reaction mixture, which leaves the second reaction section, is cooled to a temperature near the dew point, then it is led to the enrichment part of the first rectification section, where it is sprayed in counterflow with a liquid mixture consisting of the starting substances. The unreacted starting substances thus depleted of the most of the amine formed are recycled under pressure in gaseous state to the second reaction section, the liquid mixture in the impoverishment part of the section is depleted of the unreacted starting substances, and from the bottom of the first rectification section the concentrate is withdrawn to further processing.</p> |
