Process for separating the minor isomers of dinitrotoluene

Details Process for separating the minor isomers of dinitrotoluene Process for separating the minor isomers of dinitrotoluene

1985-10-01

1988-01-05

Terapane, John F.

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

Organic compounds

Oxygen containing

568932, 210660, 208310R, 585828, C07C 7910

Patent

active

047177780

ABSTRACT:
This invention comprises a process for separating the minor dinitrotoluene isomers, 2,3-dinitrotoluene and 3,4-dinitrotoluene from a feed mixture comprising 2,4- and 2,6-dinitrotoluene, and the minor isomers, which process comprises contacting the mixtures at adsorption conditions with an adsorbent comprising a Y type, or dealuminated Y type, zeolite, cation exchanged with Na, Ca or H, thereby selectively adsorbing the 2,3- and 3,4- isomers or 2,4- and 2-6 isomers, respectively. The remainder of the feed mixture is removed from the adsorbent and the minor isomers are recovered by desorption at desorption conditions with a desorbent material comprising an alcohol, ketone or an ester.

REFERENCES:
patent: 3069470 (1962-12-01), Fleck et al.
patent: 3114782 (1963-12-01), Fleck et al.
patent: 4270013 (1981-05-01), Priegnitz et al.
patent: 4467126 (1984-08-01), Zinnen
patent: 4480129 (1984-10-01), Priegnitz et al.

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