Process for the preparation of p-bromotoluene

Details Process for the preparation of p-bromotoluene Process for the preparation of p-bromotoluene

1998-05-13

1999-02-23

Siegel, Alan

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

Organic compounds

Halogen containing

570206, C07C 2200

Patent

active

058746595

ABSTRACT:
A crude bromotoluene mixture comprising at least 70 wt % of a mixture of p-bromotoluene and o-bromotoluene, and wherein the weight ratio of p-bromotoluene:o-bromotoluene is in the range of 50:50 to 99:1 is cooled to a temperature at which crystals of product enriched in p-bromotoluene are formed in a first residual mother liquor. After removing the residual mother liquor from the crystals of product enriched in p-bromotoluene, the crystals are partially melted to form a mixture of residual higher purity p-bromotoluene in the form of crystals, and a second mother liquor having a higher content of o-bromotoluene than said first residual mother liquor. This higher purity p-bromotoluene and the second mother liquor are separated from each other. The entire procedure starting with the above cooling step can be repeated as a second stage and again as a third stage each time using as the initial feed the residual higher purity p-bromotoluene that is separated from the second mother liquor of the preceding stage. Product of 99.5 wt % purity can be formed in this manner.

REFERENCES:
patent: 4571441 (1986-02-01), Miwa et al.
patent: 4605799 (1986-08-01), Miwa
patent: 4794202 (1988-12-01), Zinnen
patent: 4962245 (1990-10-01), Kanai et al.
patent: 5152875 (1992-10-01), Rittner et al.
Abstract-Derwent-of JP 04308542, Oct. 1992.
Chmical Engineers' Handbook, 5th Edition, McGraw-Hill Book Company, 1973, pp. 17-19 through 17-26.

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