z*h
发帖数: 773 | 1 【 以下文字转载自 ChemEng 讨论区 】
发信人: zyh (CH2O), 信区: ChemEng
标 题: Biofuels future and criticism
发信站: BBS 未名空间站 (Wed Oct 12 22:42:24 2011, 美东)
Highlights
► We are flooded by a wave of biased or even false information about
biofuels.
► Most advanced biofuels cannot be economically produced compared to
ethanol and H2.
► Thermodynamics determines economics.
► Cellulosic ethanol and butanol are the best short- and middle-term
biofuels.
► Sugary hydrogen would be the best ultimate biofuel.
Abstract
doi:10.1016/j.procbio.2011.08.005
Since biofuels is a hot topic, many researchers new to this field are eager to propose different solutions while they often seem not to have full understanding of the current status of technologies and numerous (hidden) constraints. As a result, the general public, policymakers, academic researchers, and industrial developers have been assaulted by a wave of biased, misinterpreted, or outright false information. In reality, only a small fraction of exploding biofuels R&D teams are addressing vital rather than trivial challenges associated with economically production of advanced biofuels. Biofuels R&D is not a completely basic science project; instead, it is a typical goal-oriented (engineering) project because so many constraints prevent economically competitive production of most advanced biofuels and are expected to do so in the future. In this opinion paper, I
present some basic rules and facts in thermodynamics, physical chemistry, and special constraints in the transport sector, sort through and challenge some claimed breakthroughs or new directions, and identify vital topics to advance biofuels in the short and long terms. Simply speaking, energy efficiency is the most important long-term criterion whereas cost is the most important short-term criterion; eventually thermodynamics determines economics. For light-duty passenger vehicles, which consume ∼60% transportation fuels, cellulosic ethanol and butanol are the best short- and middle-term biofuels, whereas sugary hydrogen would be the ultimate biofuel in the long term. The top three priorities of biofuels R&D are (i) cost-effective release of sugars from lignocellulose, (ii) co-utilization of lignocellulose components for the production of value-added compounds that subsidize whole biorefineries, and (iii) enhancing the biomass-to-kinetic energy efficiency from conversions to prime movers through a potential evolutionary scenario from ethanol or butanol/internal combustion engines (ICE) to ethanol/hybrid diesel-like ICE to sugar hydrogen fuel cell vehicles. | s*******h
发帖数: 3731 | 2 张老板V5.。。bio-butanol的titer问题咋办？
【在 z*h 的大作中提到】
: 【 以下文字转载自 ChemEng 讨论区 】
: 发信人: zyh (CH2O), 信区: ChemEng
: 标 题: Biofuels future and criticism
: 发信站: BBS 未名空间站 (Wed Oct 12 22:42:24 2011, 美东)
: Highlights
: ► We are flooded by a wave of biased or even false information about
: biofuels.
: ► Most advanced biofuels cannot be economically produced compared to
: ethanol and H2.
: ► Thermodynamics determines economics.
| z*h
发帖数: 773 | 3 Use different solvent-tolerant hosts. for example, yeast by Gevo, bacillus
subtilis (N. Kataoka, T. Tajima, J. Kato, W. Rachadech, A. Vangnai
Development of butanol-tolerant Bacillus subtilis strain GRSW2-B1 as a
potential bioproduction host. AMB Express 1, 10 (2011).).
A more aggressive solution is cell-free technology. | s*******h
发帖数: 3731 | 4 啥时候能工业化？
【在 z*h 的大作中提到】
: Use different solvent-tolerant hosts. for example, yeast by Gevo, bacillus
: subtilis (N. Kataoka, T. Tajima, J. Kato, W. Rachadech, A. Vangnai
: Development of butanol-tolerant Bacillus subtilis strain GRSW2-B1 as a
: potential bioproduction host. AMB Express 1, 10 (2011).).
: A more aggressive solution is cell-free technology.
| k*******n
发帖数: 2399 | 5 排期快到的千老说话就是不一样。。
【在 s*******h 的大作中提到】
: 啥时候能工业化？
| t******l
发帖数: 3060 | 6 Gevo都已经开始卖了阿，我有一个buddy在那里干活，这些公司的性命都挂在油价上，
油价要是跌的话，他们全完蛋。
【在 s*******h 的大作中提到】
: 啥时候能工业化？
| L*****e
发帖数: 288 | 7 张老板的那篇关于淀粉的paper怎么样了？
【在 z*h 的大作中提到】
: Use different solvent-tolerant hosts. for example, yeast by Gevo, bacillus
: subtilis (N. Kataoka, T. Tajima, J. Kato, W. Rachadech, A. Vangnai
: Development of butanol-tolerant Bacillus subtilis strain GRSW2-B1 as a
: potential bioproduction host. AMB Express 1, 10 (2011).).
: A more aggressive solution is cell-free technology.
| z*h
发帖数: 773 | 8 Filed patent disclosure.
Now I am selling it to some top journal. I will present it in the ACS
national spring meeting. It is a very sample idea. It seems that no one did
it before. | z**h
发帖数: 224 | 9 biomass to biofuel 看起来很美, 听起来很好, 毕竟石油没了, 这是一条后路. 对大
部分人来说, 就是发发文章, 申请经费, 找个工作, 凭个职称.
【在 z*h 的大作中提到】
: Filed patent disclosure.
: Now I am selling it to some top journal. I will present it in the ACS
: national spring meeting. It is a very sample idea. It seems that no one did
: it before.
| S*****n
发帖数: 6055 | 10 look forward to it!
did
【在 z*h 的大作中提到】
: Filed patent disclosure.
: Now I am selling it to some top journal. I will present it in the ACS
: national spring meeting. It is a very sample idea. It seems that no one did
: it before.
| | | h****z
发帖数: 1996 | 11 我倒是觉得biofuel这条路基本上是非走不可的 石油是真的快没了 美国政府的政策也
很明确了
学术界来说 也许确实就是像你说的那样
工业界的话已经在做很多很多工作了 像jet fuel啥的已经有完全bio的产品了，而且价
格也不贵
about
to
term
【在 z**h 的大作中提到】
: biomass to biofuel 看起来很美, 听起来很好, 毕竟石油没了, 这是一条后路. 对大
: 部分人来说, 就是发发文章, 申请经费, 找个工作, 凭个职称.
| s****e
发帖数: 392 | 12 为什么我认为ethanol 和 butanol短期还行，长期看没什么前途呢。象amyris 和
solazyme 那样直接做油会更好一些。 | z*h
发帖数: 773 | 13 Read the above paper, you will know why.
Amyris is a dead fish. Solazyme is hopeless in the long term.
Most biofuels R&D projects are trash. It is why I wrote that paper. | s****e
发帖数: 392 | 14 这么悲观，这几家前两年搞到不少钱啊。我到认为短期内得看政府能给多少补助,中期
要看电动车能进展到什么程度。 | z*h
发帖数: 773 | 15 Read that paper. Electric vehicles are hopeless in the USA. If it works,
biofuels will die. |
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