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Konu: Bio-energy

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    dgncan çevrimdışı Üyelik tarihi: 11.11.2008 Son online zamanı: 22.01.2013

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    Standart Bio-energy

    Saccharomyces cerevisiae bakterisi kullanılarak sukroz şekerinden ethanol üretimi hakkında Ege üniversitesi öğrencileri tarafından yapılan bir çalışma.





    Comparison of Di erent Production Processes for
    Bioethanol
    BelIs CAYLAK
    Ege University, Ege Technical Highschool
    Bornova, _Izmir - TURKEY
    Fazilet VARDAR SUKAN
    Ege University, Faculty of Chemistry Engineering
    Bornova, _Izmir - TURKEY
    Received 25.04.1996
    In this study, ethanol was produced with the microorganism Saccharomyces cerevisiae by using sucrose
    as a substrate. Batch processes were tested by using the same substrate, microorganism and medium
    composition. Saccharomyces cerevisiae, used in the free form in the rst group of experiments, was
    immobilized by di erent methods. In the second group of experiments agar, sponge and a natural
    material called lu a cylindrica ber were used as support materials. The batch processes with free and
    immobilized microorganisms were compared with respect to eciency and yield.
    Introduction
    The decreasing reserves and increasing value of petrochemicals have renewed the interest in the production
    of bioethanol and its use as fuel and chemical feedstock.
    Ethanol can be produced from many di erent raw materials, which are grouped according to the
    type of carbohydrates they contain, i.e., sugar, starch or cellulose. Sugar for ethanol production (sucrose,
    glucose or fructose) may be derived from any of the three classes of raw materials1 . Industrial processes
    for the production of ethanol by fermentation of molasses, beet, cane or grain sugars are well established.
    Since sugars are already available in a degradable form and yeast cells can metabolize sugars directly, these
    substrates require the least costly preparation. The other carbohydrates must be hydrolyzed to sugars before
    they can be metabolized. So, although starchy or cellulosic materials are cheaper than sugar-containing
    raw materials, the requirement of converting the starch or cellulosic materials to fermentable sugars is a
    disadvantage of these substrates2 .
    Ethanol can be produced by four main types of industrial operations: batch, continuous, fed-batch
    and semi-continuous3 .
    In batch fermentation, substrate and yeast culture are charged into the bioreactor together with
    nutrients3 . Most of the ethanol produced today is done by the batch operation since the investment costs
    are low, do not require much control and can be accomplished with unskilled labor. Complete sterilization
    and management of feedstocks are easier than in the other processes.





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