著者

松田 智 久保田 宏

出版者

日本LCA学会

雑誌

日本LCA学会誌 (ISSN:18802761)

巻号頁・発行日

vol.4, no.1, pp.67-77, 2008 (Released:2012-06-06)

参考文献数

20

被引用文献数

3 4

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Objective. The "bottle to bottle recycling" of PET bottle by chemical process, hydrolysis and re-synthesis of PET resin, was put into practical use in April of 2004 in Japan, and this method was regarded as one of the most promising routes of PET bottle recycle. There are, however, several options of PET bottle recycling that should be examined whether they are really useful or not. In this study, LCA analysis was tried to estimate the effectiveness of several alternatives of PET bottle recycling. A new concept of "Social Energy Consumption", defined as sum of energy inputs for production plus feed stock energy minus total energy loss in our society during the use and recycling of PET bottle, was proposed and used as criteria for estimating the effectiveness of the PET bottle recycling: in other words, energy equivalent of resource conservative quantity was used for estimation of recycling, that is a main characteristic of this study. Results and Discussion. Several case studies were carried out to examine the adequacy of assumed values as well as the estimation procedure adopted in this study. As a result, the reliability of the values and method was confirmed. Results of the case studies indicated that the advantage of the chemical recycle for bottle to bottle is not so larger as was expected than that of material recycle for other products, because energy input for chemical recycle is rather large, however the difference in the quality of products is not taken into account. And it was also found that bottle reproduction from flakes obtained directly by crushing used PET bottle has a better potential advantage, meaning that this recycle route will be worthy of serious consideration although this is not practical in present-day Japan by the ministerial regulation from a hygiene point of view.Conclusions. Thus, there should be more emphasis on the necessity of wide-ranging discussions on the recycle of PET bottle based on objective and quantitative LCA investigation from the stand point of, not only CO2 emission, but the social utility of repeated use of petroleum resource.

著者

小出 耕造 平原 照晏 久保田 宏

出版者

公益社団法人 化学工学会

雑誌

化学工学 (ISSN:03759253)

巻号頁・発行日

vol.30, no.8, pp.712-718,a1, 1966-08-05 (Released:2010-10-07)

参考文献数

18

被引用文献数

18 14

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気泡塔において, 気泡群の平均気泡径およひガスホールドアッブを測定した。多孔板および多孔質板より生ずる気泡の大きさな与える実験式を得た。また測定したガスホールドアップを用い気泡群の液に対する速度を求め, これに対する液の物性, ガスホールドアッブ.気泡径などの影響を検討し.気泡群の相対速度を与える実験式を得た。以上の実験結果を用いて.気泡塔でのガスホールドアッブを推算する方法を提案した.

著者

眞岸 克明 和泉 裕一 光部 啓治郎 中西 啓介 久保田 宏

出版者

特定非営利活動法人日本心臓血管外科学会

雑誌

日本心臓血管外科学会雑誌 (ISSN:02851474)

巻号頁・発行日

vol.32, no.2, pp.83-85, 2003-03-15

被引用文献数

3

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今回,われわれは,大動脈四尖弁に伴う大動脈弁閉鎖不全症の弁置換術を経験したので報告した.症例は,63歳男性で心原性ショック発症後の精査で大動脈弁閉鎖不全症の診断となり,経食道心エコーで大動脈四尖弁を認めた.手術所見では,大動脈弁左冠尖と無冠尖の間にやや小さなaccessory cuspを有する四尖弁を認めた.Hurwitzらの分類ではtype bに相当すると考えられた.手術は大動脈弁を切除し,Edward-MIRA21mm弁で置換した.術後経過に問題なく,元気に社会復帰した.大動脈四尖弁は希な疾患であるが閉認不全を伴うことが多く,文献的検討を加え報告した.