Process and catalyst for production of bisphenol-A
AssigneeShell Oil Company
InventorSimon M. Li
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Abstract
Bisphenol-A is prepared by reacting an excess of phenol with acetone in the presence of a modified sulfonic acid cationic exchange resin catalyst having a plurality of sulfonic acid sites of the general formula ##STR1## in which IER represnts the ionic exchange backbone, each a and b is an integer from 9 to about 5, and each R is selected independently from H, OH, Sh and alkyl groups. The catalyst exhibits high activity and selectively at moderate reaction temperatures, low production of colored impurities, and high stability.
Claims7
A sulfonated cationic exchange resin of general formula ##STR7## in which IER is the backbone of a sulfonated cationic exchange resin having sulfonic acid sites, each of a and b is an integer from 0 to about 5 and each R is selected independently for H, OH, SH and alkyl, said sulfonated cationic exchange resin having at least about 2 of the sulfonic acid sites ionically bound to an aminomercaptan group of the formula ##STR8##
Dependencies are inferred from the claim text.