Process for separating 2,4-toluene diisocyanate from isomers of

Details Process for separating 2,4-toluene diisocyanate from isomers of Process for separating 2,4-toluene diisocyanate from isomers of

1987-05-08

1988-01-26

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C14300

Patent

active

047218061

ABSTRACT:
This invention comprises a process for separating 2,4-toluene diisocyanate from a feed mixture with 2,6-toluene diisocyanate. The process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a Y-type zeolite cation exchanged with a cation in the group Na, Ca, Li or Mg, thereby selectively adsorbing the 2,4-toluene diisocyanate. The remainder of the feed mixture is removed from the adsorbent and the adsorbed toluene diisocyanate isomer is recovered by desorption at desorption conditions with a desorbent material comprising toluene.

REFERENCES:
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patent: 4169175 (1979-09-01), Marans et al.
patent: 4246187 (1981-01-01), Yabroff
patent: 4270013 (1981-05-01), Priegnitz et al.
patent: 4467126 (1984-08-01), Zinnen
patent: 4480129 (1984-10-01), Priegnitz et al.
59 Air Pollution Ind. Hyg., vol. 101, 1984, p. 309, Chem. Abst. 101:116099x.

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