成果報告書詳細
管理番号20120000000951
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) セルロースエタノール高効率製造のための環境調和型統合プロセス開発
公開日2012/12/21
報告書年度2011-2011
委託先名月桂冠株式会社 Bio~energy株式会社 国立大学法人京都大学 国立大学法人神戸大学 株式会社豊田中央研究所 関西化学機械製作株式会社 サントリービジネスエキスパート株式会社 鹿島建設株式会社 特定非営利活動法人近畿バイオインダストリー振興会議
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 現在、化石燃料の枯渇・地球温暖化防止の観点から、再生可能な植物性バイオマスからエタノールを製造するバイオリファイナリーに関して、前処理から製品分離に至る統合的なプロセス開発が急務となっている。本プロジェクトでは主として草本系バイオマスをターゲットとし、(1)水熱処理等による前処理、(2)セルラーゼやヘミセルラーゼを細胞表層提示にする酵母(アーミング酵母)による、糖化と、ペントース(C5糖)およびヘキソース(C6糖)からの発酵を同時に行うConsolidated bioprocessing(CBP)、(3)省エネルギー型のエタノール蒸留・脱水プロセス、(4)廃水処理と残渣の有効利用、に関して、ブレークスルーのための要素技術開発を行うとともに、それらを統合した日本オリジナルな統合プロセス開発を目指す。
英文要約Title: Development of environmentally benign and consolidated process for efficient production of cellulosic ethanol (FY2008-FY2012)
FY2011 Annual Report
1) Development of biomass processing by hydrothermal treatment
Novel pretreatment system by a combination of compression and steam was developed, which facilitated enzyme digestibility of cellulose and hemicellulose. High recovery of cellulose and hemicellulose has been achieved from high solid content. By controlling diluted acid concentration, temperature and retention time of biomass, napier grass provided highest saccharification yield of 95% glucose and 65% xylose.
2) Development of CBP
Recombinant yeast strains displaying cellulolytic enzymes on the cell surface, and expressing genes involved in xylose assimilation were developed with industrial strains as host strains. Enhancement of tolerance to ethanol, H2O2 and fermentation inhibitors was achieved by both expression of TAL1 and FDH1, and deletion of PHO13. Also, expression of genes involved in redox balance and transporter improved ethanol yield from xylose. Display of cellulases on the cell surface of yeast afforded high yield ethanol production from high-solid lignocellulose. Fermentation ability of the recombinant cell surface engineered yeast was successfully maintained a five-cycle repeated batch fermentation.
3) Development of an energy-saving ethanol-concentration/dehydration system
The recovery process for producing dehydrated ethanol from the CBP fermented mash was developed. Distillation process for enriching the 2~7 wt% bio-ethanol mash up to near the azeotropic point (> 90 wt% ethanol) has been developed with a double-tube HIDiC trayed column system installed with a dry vacuum pump between the stripping and rectifying section. Adsorption process for dehydrating the enriched distillate product up to 99.5 vol% ethanol is under development in the PSA form consisting of three parallel columns packed with molecular sieve pellets of zeolite NaA. A continuous dehydration process is performed by vapor-phase adsorption cyclically followed with vacuum desorption.
4) Beneficial use of residues and development of effluent treatment technique
A novel anaerobic-aerobic ditch residue treatment system has been optimized for its operation. With one-day HRT in each reactor, overall removal efficiencies of T-CODcr and T-BOD were 75% and more than 90%, respectively, indicating biodegradable organic matters were efficiently degraded in spite of the short HRT. Operational modification to reduce the inhibitory effect of ammonia has been considered as increase in nitrogen content in residue is expected with the new biomass candidate, Napier grass. The overall removal efficiency of T-CODcr has been greater than 98% with the modified advanced treatment system.
5) Development of process consolidation
The total system flow was revised to reflect the changes made to the process, the mass and energy balance have been re-established with the new system flow, and the cost estimation with the up-to-date information has been conducted. Merit of recycling the treatment effluent has also been taken into account.
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