成果報告書詳細
管理番号20120000000300
タイトル*平成23年度中間年報 新エネルギー技術研究開発 バイオマスエネルギー等高効率転換技術開発(先導技術開発) セルロース系バイオマスエタノールからプロピレンを製造するプロセス開発
公開日2012/12/26
報告書年度2011-2011
委託先名触媒技術研究組合 独立行政法人産業技術総合研究所 国立大学法人東京工業大学
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
本研究では、2015~2020年頃の実用化をめざし、セルロース系エタノールからプロピレンを製造するための触媒開発、反応および分離精製プロセス開発を行う。
英文要約Title: Development of technologies to produce propylene from cellulosic ethanol (FY2008-2012) FY2011 Annual Report.
(1) Metal oxide (MO) catalyst was selected as a prototype catalyst for the ETP (ethanol to propylene) reaction (designated as MO-X (X is a development number)). MO-1 prepared by means of a commercially available method showed good performance for the reaction. The modification of MO-1 with a secondary element was effective not only on the yield of propylene but also on the physical stability of the catalyst. The decrease of BET surface area of the modified MO-1 was small after the calcination in air at 500 degrees-C for more than 2,000hrs. It was found that the recycle of a intermediate to the reaction system greatly improved propylene yield and it rose up to 49% at a propylene-max-condition. The larger the amount of the intermediate recycled become, the more amount of both propylene and byproduct formed, therefore, the recycle ratio should be carefully chosen. A long term life test was conducted under the recycle system and the average yields of both propylene and ethylene during 1,300h were around 40%. (2) Extensive studies were carried out for the development of the metal oxide catalyst with high propylene yield in the conversion of ethanol to propylene (MO-2 catalyst). The activity and stability of the catalyst were improved by optimization of the catalyst composition and the preparation method. The improved catalyst with high surface area showed over 50% of the propylene yield and longer catalytic stability. (3) The reaction kinetics was analyzed, in which the propylene is produced from ethanol by MO-1 catalyst. The catalysts gave five products thorough multi reaction passes. Six reaction rate equations were made as a reaction model. The six simultaneous differential equations were solved analytically to determine the rate constants for all the reaction passes. A three dimensional simulation model which describes the energy and material balances in the catalysts packed bed reactor was made, and simultaneous partial differential equations were solved numerically. A bench scale reactor in which the propylene yield is higher than 35% from ethanol by using MO-1 catalysts has been designed by the simulation program. (4) Adsorptive desulfurization of the reaction product, which was obtained by the conversion of bioethanol over MO-1 catalyst, was examined. It was found that the concentration of hydrogen sulfide in the reaction product could be reduced lower than 10 ppb. Membrane dehydration of produced gas mixture containing propylene was investigated using several types of carbon hollow fiber membranes. The pore size of the carbon membrane was optimized and the membrane dehydration system was designed for bench-scale propylene production. (5) Design and construction of the bench plant: The purpose of the bench plant is to generate a gas which is mainly composed of propylene from a raw material of bioethanol, acetone and water via a reactor unit. The specification of the bench plant is decided as follows; (a) Processing capacity of ethanol : 100kg/day, (b) Catalyst : MO-1, (c) Reaction temperature : 400-500℃, (d) Reaction pressure : under 0.6MPaG. The first stage of construction of the bench plant was conducted.
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