Method for making bisphenol a
AssigneeArkema Inc.
InventorAnnie Commarieu
Life of this patent
Estimating the term…
Abstract
The continuous process for manufacturing bisphenol A according to the invention, by reacting phenol and acetone in the presence of a strong acid catalyst and a co-catalyst, is carried out using as co-catalyst a dithio ether of general formula: 1 in which the symbols R and R′ each represent a hydrogen atom, an alkyl radical or a phenyl radical, and the symbol R″ represents an optionally substituted alkyl radical.
Claims15
Continuous process for manufacturing bisphenol A by reacting phenol and acetone in the presence of a strong acid catalyst and a co-catalyst, characterized in that a dithio ether of general formula:
- 6
- in which the symbols R and R′, which may be identical or different, each represent a hydrogen atom, a linear or branched alkyl radical containing from 1 to 12 carbon atoms or a phenyl radical, and the symbol r″ represents a linear or branched alkyl radical containing from 1 to 12 carbon atoms and optionally substituted with a carboxylic acid group, is used as co-catalyst.
Process according to claim at 8, in which pure bis(methylthio)methane is used.
Dependencies are inferred from the claim text.