Patent ID: 6255549
Filing Date: 2001-07-03
Classification: C07B,C07C

Abstract:
A method for producing a fraction of low bromine number mainly containing a styrenic compound/aromatic compound adduct, by feeding reaction materials of a styrenic compound and an aromatic compound having at least one hydrogen atom directly connected to the carbon atom of aromatic ring, to a fixed-bed flow reactor packed with a solid acid catalyst in a liquid phase at a temperature in the range of 40 to 350.degree. C. to form a styrenic compound/aromatic compound adduct and obtaining a fraction mainly containing said adduct by distillation, whereinthe feed of reaction materials to said reactor is stopped before the bromine number of said fraction increases up to 3 grams per 100 grams,after that, in place of the feed of said reaction materials, a saturated aromatic hydrocarbon having a mean value of the proportion of aromatic ring carbons relative to total carbons in a molecule of 55% or more is fed to said reactor in a liquid phase at a temperature higher by 5 to 150.degree. C. than that of the reaction mixture just before the above stopping of feed of reaction materials, andthen the feed of reaction materials is restarted to carry out the foregoing reaction so as to obtain a fraction of low bromine number.