| 摘要 |
<p>"PROCESS FOR SEPARATING ISOMERS OF TOLUENEDIAMINE" This invention comprises a process for separating 2,4 toluenediamine from a feed mixture comprising 2,4-toluene-diamine and 2,6-toluenediamine, which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a Y type zeolite cation-exchanged with Ni or Ca or an X type zeolite cation-exchanged with Ca, Ba, Na, Ni and K, or an L type zeolite cation-exchanged with a K cation, thereby selectively adsorbing one of isomers of toluenediamine. The remainder of the feed mixture is removed from the adsorbent and the adsorbed toluenediamine isomer is recovered by desorption at desorption conditions with a desorbent material comprising a lower alcohol or an amine..</p> |
