Method of making high purity 2,4- and 3,4-dichlorotoluene

Details Method of making high purity 2,4- and 3,4-dichlorotoluene Method of making high purity 2,4- and 3,4-dichlorotoluene

1999-10-28

2000-12-05

Siegel, Alan

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

Organic compounds

Halogen containing

570206, 570210, 570211, C07C 2200

Patent

active

061569453

ABSTRACT:
Disclosed is a method of making high purity 2,4- and 3,4-dichlorotoluene from parachlorotoluene that contains some metachlorotoluene. About 0.0001 to about 5 wt % of a Friedel-Crafts catalyst and about 0.5 to about 10 equivalents of a brominating agent are added to the parachlorotoluene. The metachlorotoluene is brominated, but most of the parachlorotoluene is not brominated. Without separating the brominated products from the unbrominated products, about 0.5 to about 1.5 equivalents of a chlorinating agent are added, whereby only the unbrominated products (i.e., the parachlorotoluene) are chlorinated. The resulting 2,4-dichlorotoluene and 3,4-dichlorotoluene can be separated by distillation.

REFERENCES:
patent: 4031145 (1977-06-01), Di Bella
patent: 4827058 (1989-05-01), Mais et al.

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