The first-generation biofuel, industrialized ethanol, can have two origins: synthetic ethanol, made from petrochemical or fossil feedstock (i.e. oil derivatives, coal) and agricultural ethanol, made from sugar and starch crops (e.g. sugar cane, sugar beet, maize, wheat, rye, potatoes, etc).
Agricultural ethanol poses great concern about a possible future shortage of food. It is therefore necessary to produce ethanol from non-food biomass like weeds, waste paper, paper cup, etc. (second-generation biofuel ethanol). Solvents needed for the production of second-generation biofuel ethanol known so far are highly toxic to microorganisms. In order to remove such highly toxic solvents, complicated processes are necessary, such as washing with water, separation by centrifugation, compression, etc.
Use of Ethanol in Vehicles Lowers Pollution from Nanomaterials
World's largest flex fuel urban fleet is São Paulo city in Brazil, which shows increase of ultrafine particulate matter when ethanol prices rose and consumption fell.
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‘For dissolving biomass cellulose, Japanese researchers succeeded in reducing the toxicity to microorganisms by developing a novel solvent, a carboxylate-type liquid zwitterion.’
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As a result, the energy recovered in the ethanol so produced is less than that required to produce it, i.e., there is a negative energy balance (more production of ethanol imposes more load on the environment). It was considered impossible to solve this problem, since a harsh solvent was needed to break down recalcitrant plant materials like cellulose, while such a harsh solvent would kill microorganisms (with fragile and very vulnerable cell membranes) that play essential roles in the fermentation necessary for producing ethanol.
In the present study, researchers of Kanazawa University, Japan, attacked this problem; they succeeded in reducing the toxicity to microorganisms by developing a novel solvent, a carboxylate-type liquid zwitterion, for dissolving biomass cellulose. The EC50, the concentration of a substance that reduces the growth of Escherichia coli to 50%, was found to be 158 g/L for the newly developed carboxylate-type liquid zwitterion, whereas the EC50 of ionic liquid, one of the conventional solvents of cellulose, was 9 g/L. This indicates that the novel carboxylate-type liquid zwitterion shows 17 fold lower toxicity than the ionic liquid.
![Ethanol and 2-Butanone Associated With Larynx Cancer]( "Ethanol and 2-Butanone Associated With Larynx Cancer")
At the Rey Juan Carlos University and the Alcorcon Hospital (Madrid), researchers have compared the volatile substances exhaled by eleven people with cancer of larynx, with those of another twenty healthy people.
With Escherichia coli that can produce ethanol, fermentation ability was examined and revealed to be almost maximal in 0.5 mol/L carboxylate-type liquid zwitterion with a final ethanol concentration of 21 g/L. On the other hand, the same experiment with the ionic liquid produced only 1 g/L ethanol. Thus, fermentation in the presence of the carboxylate-type liquid zwitterion produced 21 times more ethanol than that using the ionic liquid.
In another experiment, bagasse was used as a starting plant biomass for ethanol production without washing/separation processes. Fermentation in the presence of the carboxylate-type liquid zwitterion produced 1.4 g/L ethanol, while no ethanol was obtained with the ionic liquid due to its high toxicity.
With these experimental results, it is shown that, using the carboxylate-type liquid zwitterion, plant biomass could be converted into ethanol in a single reaction pot without washing/separation processes. This should be a big step forward in the production/utilization of second-generation biofuel ethanol through reducing large amounts of energy input.
Besides the first-generation and second-generation biofuel ethanol, a third-generation biofuel, a kind of oil, may be made from some algal species. In order to obtain such a third-generation biofuel from algae, polysaccharides like cellulose, which are main components of cell walls, have to be dissolved. The energy efficiency would be much increased if dissolved polysaccharides could be converted into ethanol. Further development of our current study would significantly contribute to the production of not only second-generation but also third-generation biofuel ethanol.
Furthermore, a lot of attention has been attracted by the unique characteristics of the carboxylate-type liquid zwitterion, and three international collaborations are currently going on, one of which is with Rutgers University, U.S.A.
Source: Eurekalert
Ethanol and 2-Butanone Associated With Larynx Cancer
At the Rey Juan Carlos University and the Alcorcon Hospital (Madrid), researchers have compared the volatile substances exhaled by eleven people with cancer of larynx, with those of another twenty healthy people.
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With Escherichia coli that can produce ethanol, fermentation ability was examined and revealed to be almost maximal in 0.5 mol/L carboxylate-type liquid zwitterion with a final ethanol concentration of 21 g/L. On the other hand, the same experiment with the ionic liquid produced only 1 g/L ethanol. Thus, fermentation in the presence of the carboxylate-type liquid zwitterion produced 21 times more ethanol than that using the ionic liquid.
In another experiment, bagasse was used as a starting plant biomass for ethanol production without washing/separation processes. Fermentation in the presence of the carboxylate-type liquid zwitterion produced 1.4 g/L ethanol, while no ethanol was obtained with the ionic liquid due to its high toxicity.
With these experimental results, it is shown that, using the carboxylate-type liquid zwitterion, plant biomass could be converted into ethanol in a single reaction pot without washing/separation processes. This should be a big step forward in the production/utilization of second-generation biofuel ethanol through reducing large amounts of energy input.
Besides the first-generation and second-generation biofuel ethanol, a third-generation biofuel, a kind of oil, may be made from some algal species. In order to obtain such a third-generation biofuel from algae, polysaccharides like cellulose, which are main components of cell walls, have to be dissolved. The energy efficiency would be much increased if dissolved polysaccharides could be converted into ethanol. Further development of our current study would significantly contribute to the production of not only second-generation but also third-generation biofuel ethanol.
Furthermore, a lot of attention has been attracted by the unique characteristics of the carboxylate-type liquid zwitterion, and three international collaborations are currently going on, one of which is with Rutgers University, U.S.A.
Source: Eurekalert
Local Ozone Levels Drop 20 Percent With Switch from Ethanol to Gasoline
When fuel prices drove residents of São Paulo, Brazil, to mostly switch from ethanol to gasoline in their flexible-fuel vehicles, local ozone levels dropped 20 percent, reports an economist and a chemist in a Northwestern University study.
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 Carbon Dioxide Conversion to Methanol Made Easier!A clean, low-cost way to convert carbon dioxide into methanol, an ingredient used in the production of plastics, solvents and adhesives has now been discovered by researchers | Advertisement
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