Process for the manufacture of o-toluidine and/or m-toluidine an

Details Process for the manufacture of o-toluidine and/or m-toluidine an Process for the manufacture of o-toluidine and/or m-toluidine an

1984-08-27

1985-11-19

Shaver, Paul F.

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

Organic compounds

Amino nitrogen containing

C07C 8500

Patent

active

045543801

ABSTRACT:
The invention provides a process for the manufacture of o-toluidine and/or m-toluidine and/or p-toluidine, which comprises the two following steps (a) and (b):
(a) treatment of a toluidine isomer mixture or of the not intended toluidine isomer or of one of the not intended toluidine isomers with an isomerization catalyst selected from the group of synthetic zeolites of the pentasil type,
(b) isolation of the intended isomer or one of the intended isomers from the isomer mixture formed in step (a) by selective adsorption to a medium-pore or large-pore zeolite and subsequent desorption, furthermore discharge of the isolated isomer and recycling of the remaining isomer mixture to step (a).

REFERENCES:
patent: 3069470 (1962-12-01), Fleck et al.
patent: 4181811 (1980-01-01), Young
patent: 4371721 (1983-02-01), Wu

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