abstract |
The present invention relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol (BP-TMC). In particular, the present invention is directed to the preparation of 3,3,5-trimethylcyclohexanone (TMC-one) and 3,3,5-trimethylcyclohexylidene bisphenol (BP-TMC) from phenol in the presence of a gaseous acidic catalyst. About. The preparation is preferably carried out continuously. It is an object of the present invention to provide a solid, in particular crystallized BP-TMC, more particularly crystallized BP-TMC-phenol-adduct, when a gaseous acidic acid is injected into a reaction mixture comprising TMC-one and phenol in a reaction vessel. It is to prevent clogging the outlet of the injection valve for acidic acid. |