成果報告書詳細
管理番号20110000000991
タイトル*平成22年度中間年報 グリーン・サステイナブルケミカルプロセス基盤技術開発 触媒を用いる革新的ナフサ分解プロセス基盤技術開発 高性能ゼオライト触媒を用いる革新的ナフサ分解プロセスの開発
公開日2011/8/30
報告書年度2010 - 2010
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 国立大学法人北海道大学 国立大学法人横浜国立大学
プロジェクト番号P09010
部署名環境部
和文要約和文要約等以下本編抜粋:1.研究開発の内容および成果等 「高性能ゼオライト触媒を用いる革新的ナフサ分解プロセスの開発」では、既存熱分解プロセスに対して、石油化学品(エチレン、プロピレン、ブテン、BTX等)の収率、選択性を高めるために必要な高性能なゼオライト触媒等の開発を行うとともに、ナフサ分解プロセス内のエネルギーバランス、分離工程におけるエネルギー消費に関するプロセス設計、最適化を行って、早期に革新的な実用化プロセスに繋がる基盤技術を開発する。
英文要約We are aiming to develop high-performance zeolite catalysts that are able to produce useful petrochemical feedstocks such as ethylene, propylene, butenes and BTX from naphtha in higher yields and selectivity than the conventional thermal cracking processes. Simultaneously, we are developing fundamental technologies through process design and optimization with respect to energy balance in the naphtha cracking process and energy consumption in the separation/purification step to early reach the stage of practical application of innovative processes. Various methods of improving the performance of zeolite catalysts selected by screening done in the previous year, namely, ZSM-5 (MFI), MCM-68 (MSE), beta (*BEA), and MCM-22 (MWW), were extensively explored. On the whole, ZSM-5 proved to be the most promising catalyst in terms of activity, selectivity and duration. An increase in the external surface of ZSM-5 was attained by the post-synthesis treatment with alkaline solution, which proved to be effective in improving the catalytic performance. Nano-sized ZSM-5 zeolites were successfully synthesized without using organic templates. It was feasible to scale-up and cost-cut the synthesis of the nano-sized zeolites.
Since deactivation of the catalysts is the problem to be addressed, we have adopted various methods in order to extend the catalyst life. High-temperature pretreatment and acid pretreatment of ZSM-5 were helpful in increasing the selectivity for the desired products with the catalyst life more than twice. Inactivation of acid sites on the external surface also favorably affected the life. These improvements are ascribed to the retardation of coke formation as a result of optimization of the number and location of acid sites. The deactivation is also caused by dealumination of the catalyst. We have found that modification of ZSM-5 with P compounds made framework Al resistant toward steam at high temperatures. These improvements in the catalytic performance were correlated with the change in the type and strength of acid and resulting coke as monitored by infrared (IR) and NMR spectroscopies, etc. It was found that placement of two different ZSM-5 catalysts in series was beneficial to the catalyst life.
Techniques to form the catalysts were also explored. The La/P/ZSM-5 catalyst formed under optimized conditions gave performance similar to the powdery catalyst. Modeling of the total cracking reactions and separation/recovery system has been done to establish the base of simulation of the total system to design the naphtha cracking process. Value added tables were prepared as a function of the operation variables such as the steam/oil ratio and the regeneration cycle, which provide the practical qualitative guidelines on the course of the catalyst development.
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