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Microchannel reactive distillation for the conversion of aqueous ethanol to ethylene

Journal of Energy Chemistry 2024年第11期98卷 481-493页

作者： Johnny Saavedra-Lopez Stephen D.Davidson Paul H.Humble Dan R.Bottenus Vanessa Lebarbier Dagle Yuan Jiang Charles J.Freeman Ward E.Te Grotenhuis Robert A.Dagle Pacific Northwest National Laboratory 902 Battelle Blvd.RichlandWA 99354USA

Here we demonstrate the proof-of-concept for microchannel reactive distillation for alcohol-to-jet application:combining ethanol/water separation and ethanol dehydration in one unit *** is first distilled into the vapor phase,converted to ethylene and water,and then the water co-product is condensed to shift the reaction *** intensification is achieved through rapid mass transfer-ethanol stripping from thin wicks using novel microchannel architectures-leading to lower residence time and improved separation *** savings are realized with integration of unit *** example,heat of condensing water can offset vaporizing ***,the dehydration reaction equilibrium shifts towards completion by immediate removal of the water byproduct upon formation while maintaining aqueous feedstock in the condensed *** aqueous ethanol feedstock(40%_w),71% ethanol conversion with 91% selectivity to ethylene was demonstrated at 220℃,600psig,and 0.28 h^(-1) wt hour space velocity.2.7 stages of separation were also demonstrated,under these conditions,using a device length of 8.3 *** provides a height equivalent of a theoretical plate(HETP),a measure of separation efficiency,of ^(3).3 *** comparison,conventional distillation packing provides an HETP of ^(3)0 ***,9,1 × reduction in HETP was demonstrated over conventional technology,providing a means for significant energy savings and an example of process ***,preliminary process economic analysis indicates that by using microchannel reactive distillation technology,the operating and capital costs for the ethanol separation and dehydration portion of an envisioned alcoholto-jet process could be reduced by at least 35% and 55%,respectively,relative to the incumbent technology,provided future improvements to microchannel reactive distillation design and operability are made.

关键词： Catalytic distillation Ethanol dehydration process intensification Microchannel alcohol-to-jet process

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