Reducing meta content of isomeric mixtures of halo substituted alkylbenzenes
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United States of America Patent
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Sep 4, 2001
Issued Date -
N/A
app pub date -
Jan 10, 2000
filing date -
Nov 17, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method of separating the meta isomer of a haloalkylbenzene having the general formula ##STR1## from a mixture with at least one other isomer, where X is Cl or Br and R is alkyl from C.sub.2 to C.sub.12 or cycloalkyl from C.sub.3 to C.sub.8. About 0.0001 to about 5 wt % of a Friedel-Crafts catalyst is added to the mixture and the mixture is exposed to a brominating agent which preferentially brominates the meta isomer. The mixture is then heated at a temperature above the boiling point of the other isomers but below the boiling point of the brominated meta isomer.
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