process for the preparation of an alkene from an oxygenated compound and process for the treatment of a supported heteropolitungstic acid catalyst

摘要

process for the preparation of an alkene. a process for preparing an alkene from an oxygenated compound comprising contacting a reagent feed stream comprising at least one oxygenated reagent and water and with a heteropoly ratio catalyst supported at a temperature of at least 170 ° C, wherein the process is initiated using a starting procedure comprising the following steps: (i) heating the supported heteropoly acid catalyst to a temperature of at least 220 ° C, (ii) maintaining the heat treated supported heteropoly acid catalyst of step (i) to a temperature of at least 220 ° C for a time sufficient to remove bound water from the heteropoly acid component of the supported heteropoly acid catalyst, and (iii) by maintaining the supported heteropoly acid catalyst of step (ii) at a temperature of at least 220 ° C, contact the heteropoly acid supported with the reagent feed stream having a temperature of at least minus 220 ° C.