| 摘要 |
<p>1. Process for making C2 to C4 -olefins from gas mixtures containing methanol, dimethylether and optionally steam in the presence of catalysts at temperatures of 250 to 500 degrees C under pressures of 0.1 to 6 bars, unreacted feed material being recycled, wherein methanol or methanol/water-mixture in a ratio by volume of 1 : (0.1 to 2) is initially evaporated and reacted in a reactor having the catalyst placed therein, the reaction gases are partially condensed by cooling them and separated, in a separator, into three phases, and the oil phase consisting of higher aliphatic and aromatic hydrocarbons is removed, which comprises : water-scrubbing the remaining aqueous phase and gas phase in a scrubbing column under pressures of 1 to 40 bars ; removing overhead a gaseous hydrocarbon mixture containing predominantly C2 to C4 -olefins and separating it into its components in known manner ; removing, from the base portion of the scrubbing column, and aqueous phase containing unreacted methanol and intermediarily formed dimethylether ; distilling off the methanol and dimethylether in a stripping column and recycling them into the reactor ; and removing the water from the base portion of the stripping column.</p> |
