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Posts tagged “chemistry”

By Robert Rapier on May 23, 2009 with no responses

Chemistry: The Future of Cellulose

I am not a big believer in a commercial future for the biochemical conversion of cellulose into fuels. There are many big hurdles in place that are going to have to be overcome before cellulose is commercially converted to ethanol. In a nutshell, one is the logistical problem, which I have covered before. Beyond the logistical problem is the issue that biochemistry often starts to malfunction as the conditions in a reactor change, and with cellulosic ethanol that means that if you get a 4% solution of ethanol in water, you are doing well. But from an energy return point of view, a 4% solution is about like the trillions barrels of oil shale reserves we have. If it takes… Continue»

By Robert Rapier on Jun 17, 2008 with 1 response

Fire from Water

Based on some of the comments following my post on the “water car”, I think several people misunderstood the point. It was not to debunk the water car. You can in fact run a car with water as one of the reactants. I could even run a car on crushed ice or Jell-O, if I used the right second reactant. My point was merely to show how a car could be run on water, and to further point out that it requires a second, very reactive substance. In other words, the “water car” is not running solely on water. The other point was that the reactive substance will always take more energy to produce than you will get back from… Continue»