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Xylenes production from renewable feedstocks
Author(s)
Ausavasukhi, A.
Date Issued
December 1, 2013
Type
Book Chapter
Abstract
Considerable efforts have been made during the past few years for utilizing renewable resources for chemical feedstock. As being ligno-cellulosic materials, biomass provides ready-to-use aromatic precursors for the production of xylene from biomassderived compounds. Typical approach involve fast-pyrolysis of the biomass followed by catalytic deoxygenation of the aromatic components (mainly the phenolics) in the "pyrolysis bio-oil" As the pyrolysis products always possess reactive oxygenates such as alcohols, aldehydes, and acids, the reaction requires a catalyst that readily promotes deoxygenation and/or dealkylation to form less substituted aromatic ring. Metals supported acidic oxides have been widely investigated for the reactions involving hydrogen (hydrogenation/ dehydrogenation and hydrogenolysis) and carbocation intermediates. Alternatively, refined biomass such as ethanol, fatty acid and glucose can also be converted to aromatic hydrocarbons. This approach involves dehydration, decarbonylation and/or decarboxylation to primarily produce olefinic or paraffinic hydrocarbons which can be subsequently converted to aromatic via classical acid catalysed processes. Shape selective feature of the zeolites always plays marked role for selective formation of xylenes for all approaches. This chapter will review recent attempts for xylene productions from renewable feedstock. The relation between the molecular architecture of the biomass-derived compounds and the selected catalyst system will be highlighted, together with the reaction conditions and possible on-going xylene production processes. © 2013 by Nova Science Publishers, Inc. All rights reserved.
Citation
Xylenes Synthesis Characterization and Physicochemical Properties, 34-55, 2013