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- Newsgroups: sci.chem
- Path: sparky!uunet!boulder!ucsu!ucsu.Colorado.EDU!smithrs
- From: smithrs@ucsu.Colorado.EDU (SMITH RANDALL SCOTT)
- Subject: Re: Why Not ? (Re: Ethanol fuel
- Message-ID: <1992Nov15.201346.9786@ucsu.Colorado.EDU>
- Sender: news@ucsu.Colorado.EDU
- Nntp-Posting-Host: ucsu.colorado.edu
- Organization: University of Colorado, Boulder
- References: <1992Nov12.163140.17642@netcom.com> <1992Nov12.204701.18307@news.clarkson.edu> <4828@equinox.unr.edu>
- Date: Sun, 15 Nov 1992 20:13:46 GMT
- Lines: 40
-
- In article <4828@equinox.unr.edu> whitbeck@equinox.unr.edu (Michael Whitbeck) writes:
- >In article <1992Nov12.204701.18307@news.clarkson.edu> rajat@sun.soe.clarkson.edu (Rajat Kapoor) writes:
- >>From article <1992Nov12.163140.17642@netcom.com>, by ckp@netcom.com (Charles Pooley):
- >>
- >>Also, US farmers may benefit economically ( rather, they hope to )
- >>from this venture. Environmentally, as an oxygenate it makes sense, and
- > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- >>also saves on petroleum...raw material for almost all organics.
- >>
- >
- >Ethanol, as a fuel or fuel additive, contributes to the aldehyde
- >emissions in the exhaust. Aldehydes promote an earlier onset of
- >photochemical smog and higher levels of ozone and
- >peroxynitrates. If you want to see REALLY severe air pollution
- >try any large Brazilian city. This is not intended as a slam
- >against Brazil, economics is the driving force for their ethanol
- >fuel program; air pollution is part of the price tag.
- >
- >The present trend to add oxygenated compounds to gasoline *may*
- >not make as much sense as it is touted. Undoubtedly in some
- >cases it is valid; while in others it may not be valid. Here you
- >are trading one pollutant (CO) (and possibly only marginally)
- >for others (ozone, NO2, PAN's). Is this beneficial to health?
- >-- difficult to say but probably not. Is it cost effective for
- >reducing CO? Hardly seems likely compared to incentive programs
- >to repair/upgrade old autos or to promote mass trasit.
- >
-
- One must also consider the fact that addition of ethanol to hydrocarbon
- fuel tends to increase the vapor pressure of the fuel. Thus, although
- 10% ethanol will decrease the CO emissions from the engine, it increases
- the hydrocarbon emissions from the fuel tank and lines. In the end, I
- agree with Mike. The most effective method of reducing emissions _overall_
- is to provide incentive programs to repair/upgrade old autos, to promote
- mass transit, and to develop alternitive energy sources that are _less
- polluting_ than those currently available.
-
- Randall Smith
- smithrs@ucsu.colorado.edu
-
-