| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing an alkene from an oxygenate, the process being excellent in selectivity where the formation of alkanes is reduced.SOLUTION: A process for preparing an alkene from an oxygenate comprises contacting a reactant feedstream comprising at least one oxygenate reactant and water with a supported heteropolyacid catalyst at a temperature of at least 170°C, wherein the process is initiated using a start-up procedure comprising the following steps: (i) heating the supported heteropolyacid catalyst to a temperature of at least 220°C; (ii) maintaining the heat-treated supported heteropolyacid catalyst in the step (i) at a temperature of at least 220°C for a time sufficient to remove bound water from the heteropolyacid component of the supported heteropolyacid catalyst; and (iii) whilst maintaining the supported heteropolyacid catalyst in step (ii) at a temperature of at least 220°C, contacting the heteropolyacid catalyst with the reactant feedstream having a temperature of at least 220°C.SELECTED DRAWING: None |
