| 摘要 |
In the catalytic cracking of methyl-tert. butyl ether (MTBE), the cracked product (II) is distilled to give an isobutene (IB) head stream (III) and a sump stream (IV) of diisobutene, MTBE and methanol. (IV) is distilled to give a sump stream (V) of methanol; a side stream (VI) of diisobutene, methanol and MTBE; and a head stream (VII) of MTBE and methanol, which is recycled to the cracking stage. A method for cracking methyl-tert. butyl ether (MTBE) involves: (a) cracking MTBE, contained in two streams (I) and (II), over a catalyst; (b) distilling the product (II) to give a head stream (III) containing more than 90 wt. % isobutene (IB) and a sump stream (IV) containing diisobutene, MTBE and more than 80% of the methanol contained in (II); (c) distilling (IV) to give a sump stream (V) containing methanol, a side stream (VI) containing diisobutene, methanol and MTBE and a head stream (VII) containing MTBE and methanol; and (d) recycling (VII) to stage (a). |
