Multi-strand plant and process for producing olefins from oxygenates

A multi-strand plant for producing olefins from an oxygenates-containing fluid input mixture comprising the following constituents and assemblies in fluid connection with one another:

• (a) at least two reactor trains arranged in parallel and operable in parallel, wherein each reactor train comprises:
• (a1) at least one oxygenate-to-olefin reaction zone containing a catalyst active and selective for the conversion of the oxygenates into olefins under oxygenate conversion conditions, a means for supplying the oxygenates-containing input mixture to the reaction zone, a means for discharging an olefins-containing partial product stream from the reaction zone, a means for supplying a gaseous oxygen-containing regenerant to the reaction zone, and a means for discharging a carbon oxides-containing regeneration offgas from the reaction zone,
• (a2) a thermal recovery apparatus arranged downstream of the reaction zone comprising at least one heat exchanger for performing indirect heat exchange between the product gas discharged from the reaction zone and a cooling fluid,
• (a3) a partial product conduit arranged downstream of the thermal recovery apparatus for discharging the partial product stream from the reactor train,
• (a4) a shutoff device in the conduit path of the partial product conduit for separating a reactor train from downstream plant parts and parallel reactor trains,
• (b) a connecting device arranged downstream of the individual reactor trains for combining the individual partial product conduits into a complete product conduit,
• (c) a compressor arranged downstream of the connecting device for compressing the complete product supplied using the complete product conduit,
• (d) a multi-stage workup apparatus arranged downstream of the compressor for separating the compressed complete product into a plurality of olefin-containing hydrocarbon fractions,
• (e) wherein furthermore at least one first quench zone for performing direct heat exchange between one or more partial product streams or the complete product stream and a first quenching medium is comprised, wherein the first quench zone is arranged downstream of the thermal recovery apparatus and upstream of the compressor.