| 摘要 |
THE INVENTION CONCERNS A PROCESS FOR PREPARING A TERTIARY ALKYL ETHER PRODUCT. THE PROCESS COMPRISES REACTING THE ISOOLEFINS OF AN OLEFINIC HYDROCARBON FEEDSTOCK IN A REACTION ZONE (1-3) WITH AN ALKANOL TO FORM A REACTION MIXTURE, WHICH IS SUBJECTED TO DISTILLATION IN A FIRST DISTILLATION ZONE (4). THE BOTTOMS PRODUCT OF THE FIRST DISTILLATION CONTAINS THE ETHER(S), WHEREAS THE OVERHEAD STREAM CONTAINS UNREACTED ALKANOL AND A MIXTURE OF LIGHT HYDROCARBONS. THE OVERHEAD STREAM IS SUBJECTED TO A SECOND DISTILLATION IN A SECOND DISTILLATION ZONE (15). THE OVERHEAD PRODUCT OF THE SECOND DISTILLATION MAINLY CONTAINS THE LIGHTEST HYDROCARBONS AND A SMALL AMOUNT OF ALKANOL, AND THE BOTTOMS PRODUCT CONTAINS AN ESSENTIALLY OXYGENATE-FREE HYDROCARBON STREAM WHICH CAN BE USED AS SUCH FOR ALKYLATION. IN ORDER TO INCREASE THE CONVERSION OF THE PROCESS, A SIDE DRAWOFF IS WITHDRAWN FROM THE SECOND DISTILLATION ZONE (15) AND RECIRCULATED TO THE REACTION ZONE (1-3). |
