New Process Turns Biofuel Waste Into Clean Hydrogen
December 1, 2007 1:35 AM
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Scientists at the University of Leeds have found a way to break biofuel byproduct sludge down into clean components
Biofuel is one form of alternative energy touted as a clean and renewable resource: a great alternative to petroleum fuel.
But not everyone agrees
. Hydrogen fuel is another popular alternative, as
Honda recently demonstrated
Dr. Valerie Dupont
and her team at the University of Leeds have come up with a way to make both more appealing -- and more importantly, cost effective.
The often unknown byproduct of biodiesel fuel production is glycerol, a sugar alcohol. While glycerol has many uses from food sweeteners to health care products to explosives, disposing of the low-value crude waste is becoming a problem. The process developed at Leeds turns this waste into clean hydrogen, water and carbon dioxide.
Dupont's separation process involves mixing glycerol with steam at a controlled pressure and temperature. This acts to separate the glycerol into base molecules of hydrogen, water and carbon dioxide, and leaves no other byproducts. The carbon dioxide is filtered out with special absorbent material, leaving the hydrogen and water.
Dupont explains, "Our process is a clean, renewable alternative to conventional methods. It produces something with high value from a low grade by-product for which there are few economical upgrading mechanisms. In addition, it’s a near ‘carbon-neutral’ process, since the CO2 generated is not derived from the use of fossil fuels."
The new process could be another step closer to a hydrogen economy. Creating an infrastructure for such a fuel system would be quite costly, but as more inexpensive methods to create the key element surface, the far-reaching idea is starting to look more plausible.
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RE: CO2 is still CO2
12/1/2007 3:20:52 PM
1.)You really think CO2's the same?
2.)If I put you in a room with a tub of liquid CO2 you'd be fine. If I did the same thing with you in a room with enough gaseous CO2, you'd be dead.
3.)Also, try touching some gaseous CO2. No problem right? Now try it with some liquid CO2."
1.) yes it is
2.) wait few minutes and it would be the same as if you would turn up gaseous pipe of CO2
3.) touching CO2(s)? well, at ~-70°C I guess you would end with freezed fingers/hand(?) (at least I guess so, but I didn't have any chance to play with this stuff, so I'm not sure).
What you are describing is just the state of the chemical subject. CO2 is liquid at around -55°C and 5atm pressure. when you heat it up, lower the pressure, it vaporises.
RE: CO2 is still CO2
12/1/2007 4:12:27 PM
Just to point out that while I've never touched liquid CO2 I did touch liquid N2 at -195°C, the point is to not leave your hand or fingers in it long enough to freeze.
And there's people fooling around with solid CO2 at -80°C, just type dry ice on you tube...
RE: CO2 is still CO2
12/1/2007 4:55:31 PM
True, the first analogy was probably flawed. I was assuming there would be circulation of air, and a closed system. Under those conditions, the CO2(l) would reach equilibrium with CO2(g) at a certain point, and you'd be alive until the oxygen ran out.
My point is not that the states are different (they are though), but my point is that CO2 in a different state is easier to manage. There is no chance of liquid CO2 stored in a cylinder causing global warming or having a greenhouse effect.
And yes, I've worked with liquid and solid CO2 before. It's cold, and it'll give you some serious frostbite.
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