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Process,reactor and catalyst design:Towards application of direct conversion of methane to aromatics under nonoxidative conditions

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Carbon Resources Conversion 2019年第3期2卷 157-174页

作者： Zhan-Guo Zhang National Institute of Advanced Industrial Science and Technology(AIST) 16-1 OnogawaTsukubaIbaraki 305-8569Japan

The mo/hzsm-5 catalyzed,non-oxidative methane dehydroaromatization reaction provides a promising direct approach for production of benzene as well as naphthalene from CH4 resources and therefore its early industrial application is highly desired.A simplified methane dehydroaromatization process that consists of only one reactor unit and two product separation units is presented,and the factors that could significantly affect the process efficiency are quantitatively *** efficiently separating and recycling up to 70vol%unreacted CH4 from the stream out of condensable aromatics separation unit might become the main problem in maximizing the process efficiency,increasing the operating temperature as high as possible of the CH4 converter in the reactor unit and raising the system operation pressure to a level somewhat higher than one atmosphere should help maximize the process *** process-required high reaction temperatures,however,mo/hzsm-5 catalyst suffers from vary rapid deactivation due to serious coke ***,it becomes necessary to employ a reactor system that enables continuous and simultaneous regeneration of deactivated catalyst so as to maintain the catalytic activity and stability of catalyst over a sufficiently long operation *** years of sustained R&D efforts of the author’s team have led to a few applicable technologies related to preparation of a fluidizable binder-free mo/hzsm-5 catalyst for use in fluidized bed reactors,regeneration of deactivated mo/hzsm-5 catalyst using H_(2),and design and operation of a dual-bed circulating fluidized bed reactor system for continuous processing of the mo/hzsm-5 catalyzed methane dehydroaromatization *** at 1073 K and under a continuous regeneration mode,an in-house developed binder-free 6%mo/hzsm-5 catalyst has proven to be capable of providing a stable benzene yield of approximately 13%over a cumulative period of 1800 ***,minimizing the cataly

关键词： Methane Aromatization mo/hzsm-5 catalyst Diffusion Coke formation Deactivation Regeneration Fluidized bed reactor Process design

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