High purity isoamylene production from tertiary amyl methyl ether decomposition

A system for producing a high purity isoamylene stream, the system comprising:

• a reaction zone configured to react an isoamylene containing stream with methanol to produce a crude tertiary amyl ether;
• a purification zone comprising a divided wall distillation column configured to receive the crude tertiary amyl ether from a feed source, the divided wall distillation column configured to separate the crude tertiary amyl ether into an overhead lights stream, a bottom heavies stream, and a tertiary amyl ether containing side draw stream;
• a heat exchanger for vaporizing the tertiary amyl ether containing side draw stream;
• a decomposition reactor containing a decomposition catalyst configured to convert the tertiary amyl ether into isoamylene and alcohol and to produce a reaction effluent;
• and
• a separation zone configured to receive the reaction effluent and to separate the reaction effluent into an alcohol stream, a vent stream, a heavy oxygenate stream, and an isoamylene product stream;
• and a feed line for feeding the heavy oxygenate stream to the purification zone,
• wherein the separation zone comprises:
• an isoamylene lights column configured to receive the reactor effluent and to separate the reactor effluent into an overhead stream and a bottoms stream comprising the heavy oxygenates, recovered as the heavy oxygenate stream;
• a methanol extraction column, configured to receive the overhead stream from the isoamylene lights column and to recover an overheads stream and to recover the alcohol stream as a bottoms stream;
• and
• an isoamylene finishing column, configured to receive the overheads stream from the methanol extraction column and to recover the vent stream as an overheads product and to recover the isoamylene product stream as a bottoms product.