PREPARATION OF RESORCINOL AND RESORCINOLS SUBSTITUTED BY LIQUID DEHYDROGENATION OF CYCLIC 1,3-DIONES DERIVED FROM THE VAPOR PHASE CYCLISATION OF DELTA-CETOCARBOXYL ACID ESTERS

摘要

P A PROCESS FOR THE PREPARATION OF RESORCINOL AND RESORCINOLS SUBSTITUTED BY A FIRST REACTION STEP OF CYCLISATION IN THE VAPOR PHASE OF A DELTA-CETOCARBOXYLIC ACID ESTER ON A COAL CATALYST BED IS DESCRIBED. - INTERMEDIATE CYCLIC DIONE. THE DELTA-CETOESTER IS MOVED THROUGH THE CATALYST BED BY A GAS CARRIER CHARACTERIZED IN THAT IT IS LIQUID AT 25C AND HAS A HIGHLY BOILING POINT SO THAT THE GAS CARRIER IS EASILY CONDENSABLE IN AMBIENT CONDITIONS. IN A SECOND REACTIONAL STEP, A LIQUID IN WHICH THE INTERMEDIATE CYCLIC 1,3-DIONE IS DISSOLVED IS COMBINED WITH A NOBLE METAL CATALYST ON A SUPPORT TO FORM RESORCINOL OR A SUBSTITUTED RESORCINOL. /P