| abstract |
THE INVENTION PROVIDES A PROCEDURE FOR THE SELECTIVE PRODUCTION OF PARA-XYLENE, WHICH CONSISTS OF REACTIONING TOLUENE WITH METHANOL, IN THE PRESENCE OF A CATALYZER THAT INCLUDES A POROUS CRYSTAL MATERIAL WITH A DIFFUSION PARAMETER FOR 2.2 DIMETHYLBUTANEOUS. 0.1-15 S -1, WHEN MEASURING A TEMPERATURE OF 120 C AND A PRESSURE OF 2,2 - DIMETILBUTANE OF 60 TORR (8 KPA). THE POROUS CRYSTAL MATERIAL IS PREFERIBLY A MEDIUM-SIZED PEDE ZEOLITE, ESPECIALLY ZSM-5, THAT HAS BEEN TREATELY TREATED WITH VAPOR AT A TEMPERATURE OF AT LEAST 950 C. SUCH POROUS CRYSTAL MATERIAL IS COMBINED UNFORGETTABLE WITH A MODEL WHICH PREFERIBLY INCLUDES PHOSPHORUS, TO CONTROL THE REDUCTION OF THE VOLUME OF THE SUCH MATERIAL MICROPORTS DURING THE STEAM TREATMENT STAGE. |