| 摘要 |
The invention relates to a process for continuously preparing one or more olefins from an aqueous solution of the corresponding alcohol(s), comprising the steps of: - providing a solids-free aqueous solution of the alcohol(s), - conducting this solution through a reactor filled with a fixed bed catalyst in such a way that the solution comes into contact with the catalyst as it flows through the reactor, at a temperature of at least 300°C and a pressure of at least 220°C in such a temperature-pressure combination that the alcohol(s) is/are converted under supercritical conditions, and - transferring the biphasic mixture formed to a separator in which the mixture is separated into a crude olefin gas phase and an aqueous liquid phase, - where the catalyst is selected from metal oxides having the properties of a Brønsted acid, insoluble metal or semimetal phosphates and porous materials selected from pumice and charcoal, the surface of which has been covered with inorganic acid groups. The process is especially suitable for aqueous solutions having a high water content. It can be performed advantageously using continuously operated reactor systems. |
