成果報告書詳細
管理番号20160000000425
タイトル*平成27年度中間年報 セルロース系エタノール生産システム総合開発実証事業 最適組合せの検討及び事業性評価 パルプを用いた水蒸気爆砕法によるバイオエタノール生産に関する技術開発及び事業性評価
公開日2016/6/15
報告書年度2015 - 2015
委託先名株式会社Biomaterial in Tokyo 三友プラントサービス株式会社 コスモ石油株式会社
プロジェクト番号P14025
部署名新エネルギー部
和文要約
英文要約Title: Developing and Evaluating the Use of Steam Explosion on Pulp for Bioethanol Production
Entrustment
Biomaterial in Tokyo Co., LTD.
Cosmo Oil Co., Ltd.
Sanyu Plant Service Co., Ltd
Joint Implementation
Shinshu University


The use of steam explosion on woody biomass has proven to reduce saccharification time and the amount of enzymes needed. The efficiency of saccharification using enzymes made in-house was comparable to enzymes bought commercially, showing that enzyme costs could be reduced by producing enzymes on-site. Furthermore, the use of non-GMO xylose fermenting Candida intermedia with saccharified pulp treated at at 220-C or higher showed inhibited fermentation, but ethanol conversion rates of 80% or higher were seen when using pulp treated below 200-C. This was comparable to using genetically modified Saccharomyces cerevisiae.
A survey of pulp production showed that waste pulp from large-scale paper mills were most ideal in terms of available quantity and price. Waste pulp collected from waste water in Kraft pulp mills are similar in composition to LBKP, so LBKP was used as a substitute in evaluating the effectivity of steam explosion, and the ethanol production system was evaluated based on the results obtained from the tests. Developing an environmentally and economically sustainable system was deemed possible by applying steam explosion on cheap and abundant waste pulp from large paper mills, followed by saccharification with enzymes produced on-site and fermentation with non-GMO yeasts.
The designing and construction of the pilot plant was started in the 4th quarter of 2015. The necessary conditions for a production plant are as follows:
1. Biomass feedstock is added to the steam explosion equipment and continuously processed.
2. The pre-treated biomass is continuously transferred to the saccharification tank and saccharified.
3. Remaining residues are removed with a filter press, centrifuge, membrane filtration, etc. to obtain a clarified sugar solution. Further concentration with an evaporator may be done if necessary.
4. The sugar solution is transferred to the fermentation tank to be fermented.
5. The C5 fermenting microbes are removed with a separator for re-use.
6. Fermentation broth is distilled.
Since distillation technology are already well established, distillation will only be done on a small lab scale to confirm ethanol productivity. This unified system will be realized at the plant planned by Sanyu Plant Services in Kawasaki.
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