production bioethanol from corn stover

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    Production Bioethanol From

    Corn Stover

    By :

    Cindi Ramayanti03012681318011

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    Background

    World oil consumption for energy andtransportation applications has increasedtremendously over the past decades as the worldpopulation grew, and more countries becoming

    industrialized. Even domestic products likeplastics, chemicals, toiletries, clothes, foodpackaging, automobile parts and buildingmaterials are made from petrochemicals. To

    supplement these fossil based fuels, severalethanol-gasoline blends are currently in themarket

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    Corn Stover

    Corn stovers is the agricultural residues (the stalks

    and leaves) that remain after corn is harvested, are a

    substantial source of inexpensive and abundant

    lignocellulosic biomass (Hess et al. 2009).

    Corn Stover

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    Composition of Corn Stover

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    Basic Methodology

    Raw Material Size Reduction Pre-treatment

    HydrolysisFermentationPurification

    Bioethanol

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    Literature Review from Journal

    N

    u

    Year Topic Content Advantages dissadvantage

    1. 2008 Cellulosic

    ethanol

    production

    from AFEX-

    treated cornstover using

    Saccharomyces

    cerevisiae

    424A(LNH-

    ST)

    The technology was able to

    achieve 191.5 g EtOH/kg

    untreated CS, at an ethanol

    concentration of 40.0 g/L

    (5.1vol/vol%) withoutwashing of pretreated

    biomass, detoxification, or

    nutrient supplementation.

    1.Highly fermentable

    Hydrolysate

    2.AFEX produces

    inhibitory degradation

    compounds at areduced level

    3.Preserves nutrients

    in biomass for

    fermentation

    1. Fermentable sugar

    concentration is

    still low.

    2. There some sugar

    derivates were oliand polymer,

    which could not be

    use by yeast.

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    Nu Year Topic Content Advantages disadvantages

    1. 2010 Simultaneous

    Saccharification and

    Fermentation of Ground

    Corn Stover for the

    Production of Fuel

    Ethanol using

    Phanerochaete

    chrysosporium,

    Gloeophyllum trabeum,

    Saccharomyces

    cerevisiae and

    Escherichia coli K011

    The conversion of corn stover toethanol was 2.29 g/100 g

    corn stover for the sample

    inoculated with S. cerevisiae,

    whereas for the sample

    inoculated

    with E. coli K011, the ethanol

    concentration was 4.14 g/100 g

    corn stover. While for the

    corn stover treated with G.

    trabeum, the conversion of corn

    stover to ethanol was 1.90 g/100

    g and 4.79 g/100 g corn stover for

    the sample inoculated with S.

    cerevisiae and E. coli K011

    i. End-product (glucoseand cellobiose) inhibition

    of the enzymatic

    saccharification is

    greatly reduced

    (Shapouri 2007).

    ii. The potential loss of

    fermentable sugars

    (glucose and xylose) can

    be avoided as the

    supernatant constituents

    do not need to be

    separated or transferred.

    iii. Lower capital and

    maintenance cost as the

    number of vessels for

    processing are fewer.

    The decrease in capitalinvestment is estimated

    to be more than 20%.

    1. There co-product

    acetic acid and

    lactic acid

    2. Fermentation using

    fungal as yeast get

    a more little

    product than

    bacterial yeast.

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    Literature Review

    Nu Year Topic Content Advantages disadvantages

    1. 2012 Ethanol

    Production From

    Corn Stover

    Pretreated By

    Electrolyzed

    Water And A

    Two-stepPretreatment

    Method

    The highest glucan conversion

    yields were 83% obtained at 195C

    for 30 min with acidic electrolyzed

    water and 83% by the two-step

    process, where the second step of

    the pretreatment was at 135C for

    30 min.

    1. By using the methods,

    nutrient addition is no

    need.

    2. The hydrolyzates from

    the two pretreatment

    methods showed good

    performance in S.cerevisiae fermentation

    tests.

    3. Electrolyzed water

    pretreatment does not

    in-volve chemical

    additions such as acid,

    lime or ammonia that

    would increase costs

    and must be neutralizedor recovered.

    1. They could be further

    broken down to

    formic acid and

    levulinic acid.

    2. HMF and furfural

    could be consumed

    during yeastfermentation

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    Conclusion

    Corn stover can be a source of fuel energy

    The biggest ethanol result comes from first

    journal. Technology achieved is 191.5 g

    etOH/untreated CS.

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    References

    1. Anak Vincent, Mickey (2010) Sequential Saccharifcation And

    Fermentation Of Corn Stover For The Production Of Fuel Ethanol

    Using Wood-rot Fungi, S. cerevisiae And E. coli K011. Iowa State

    University.

    2. English, Burton et all. Using Corn Stover for Ethanol Production.University of Tenesse.

    3. Lau, Ming W and Dale, Bruce E (2008) Cellulosic Ethanol

    Production from Afex-treated Corn Stover using Saccharomyces

    cerevisiae 424A(LNH-ST). Michigan State University.

    4. Juan, Wang X et all (2012) Ethanol Production from Corn Stover

    Pretreated by Electrolyzed Water and A Two-step Pretreatment

    Method. Dalian University of Technology.

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    Thank You