Process for separating a feed mixture comprising 2,6-...

Details Process for separating a feed mixture comprising 2,6-... Process for separating a feed mixture comprising 2,6-...

C - Chemistry, Metallurgy

07

C

260/496.1

C07C 263/20 (2006.01) C07C 265/14 (2006.01)

Patent

CA 1313192

"PROCESS FOR SEPARATING A FEED MIXTURE COMPRISING 2,6-TOLUENE DIISOCYANATE AND 2,4-TOLUENE DIISOCYANATE" ABSTRACT This invention comprises a process for separating a feed mixture comprising 2,6-toluene diisocyanate and 2,4-toluene diisocyanate. The process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a Y-type zeolite cation exchanged with a potassium cation, thereby selectively adsorbing the 2,6-toluene diisocyanate or with an adsorbent comprising a Y-type zeolite, cation exchanged with a cation from the group Na, Ca, Li, Mg and mixtures thereof, thereby selectively adsorbing said 2,4-toluene diisocyanate. The remainder of the feed mixture is removed from the adsorbent and the adsorbed toluene diisocyanate 2,6-isomer is recovered by desorption at desorption conditions with a desorbent material comprising toluene.

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