The Experts below are selected from a list of 2775 Experts worldwide ranked by ideXlab platform

Maria C Cuellar - One of the best experts on this subject based on the ideXlab platform.

  • microbial Advanced Biofuels Production overcoming emulsification challenges for large scale operation
    Trends in Biotechnology, 2014
    Co-Authors: Arjan S Heeres, Carolina Siqueira Franco Picone, Luuk A M Van Der Wielen, Rosiane Lopes Da Cunha, Maria C Cuellar
    Abstract:

    Isoprenoids and alkanes produced and secreted by microorganisms are emerging as an alternative biofuel for diesel and jet fuel replacements. In a similar way as for other bioprocesses comprising an organic liquid phase, the presence of microorganisms, medium composition, and process conditions may result in emulsion formation during fermentation, hindering product recovery. At the same time, a low-cost Production process overcoming this challenge is required to make these Advanced Biofuels a feasible alternative. We review the main mechanisms and causes of emulsion formation during fermentation, because a better understanding on the microscale can give insights into how to improve large-scale processes and the process technology options that can address these challenges.

Jens Nielsen - One of the best experts on this subject based on the ideXlab platform.

  • from flavors and pharmaceuticals to Advanced Biofuels Production of isoprenoids in saccharomyces cerevisiae
    Biotechnology Journal, 2013
    Co-Authors: Stefan Tippmann, Yun Chen, Verena Siewers, Jens Nielsen
    Abstract:

    Isoprenoids denote the largest group of chemicals in the plant kingdom and are employed for a wide range of applications in the food and pharmaceutical industry. In recent years, isoprenoids have additionally been recognized as suitable replacements for petroleum-derived fuels and could thus promote the transition towards a more sustainable society. To realize the biofuel potential of isoprenoids, a very efficient Production system is required. While complex chemical structures as well as the low abundance in nature demonstrate the shortcomings of chemical synthesis and plant extraction, isoprenoids can be produced by genetically engineered microorganisms from renewable carbon sources. In this article, we summarize the development of isoprenoid applications from flavors and pharmaceuticals to Advanced Biofuels and review the strategies to design microbial cell factories, focusing on Saccharomyces cerevisiae for the Production of these compounds. While the high complexity of biosynthetic pathways and the toxicity of certain isoprenoids still denote challenges that need to be addressed, metabolic engineering has enabled large-scale Production of several terpenoids and thus, the utilization of these compounds is likely to expand in the future.

Robert A Moreau - One of the best experts on this subject based on the ideXlab platform.

  • analysis and comparison of bio oil produced by fast pyrolysis from three barley biomass byproduct streams
    Energy & Fuels, 2010
    Co-Authors: Charles A. Mullen, Akwasi A. Boateng, Kevin B Hicks, Neil M Goldberg, Robert A Moreau
    Abstract:

    Fluidized-bed fast pyrolysis was carried out on three different barley biomass coproduct streams, straw, hulls, and distiller’s dried grains with solubles (DDGS), from Saccharomyces cerevisiae fermentation of barley grain. Each of these byproducts of fuel ethanol Production from barley grain is a possible source of feedstock for Advanced Biofuels Production via fast pyrolysis. Bio-oil recovery was in the range of 42−50 wt % of the biomass, but optimized yields could be as much as 70 wt % for each feedstock when the mass balance is mathematically adjusted to account for all unrecovered products using optimization modeling. Biochar yields were 16−21% from the barley feedstocks. Bio-oil produced from straw and hulls had an energy content of 24−25 MJ/kg on a dry basis, while bio-oil produced from DDGS had a dry basis energy content >30 MJ/kg. The bio-oils were further characterized for composition and stability. None of the bio-oils were found to be shelf-stable, as established by an increase in average molec...

Arjan S Heeres - One of the best experts on this subject based on the ideXlab platform.

  • microbial Advanced Biofuels Production overcoming emulsification challenges for large scale operation
    Trends in Biotechnology, 2014
    Co-Authors: Arjan S Heeres, Carolina Siqueira Franco Picone, Luuk A M Van Der Wielen, Rosiane Lopes Da Cunha, Maria C Cuellar
    Abstract:

    Isoprenoids and alkanes produced and secreted by microorganisms are emerging as an alternative biofuel for diesel and jet fuel replacements. In a similar way as for other bioprocesses comprising an organic liquid phase, the presence of microorganisms, medium composition, and process conditions may result in emulsion formation during fermentation, hindering product recovery. At the same time, a low-cost Production process overcoming this challenge is required to make these Advanced Biofuels a feasible alternative. We review the main mechanisms and causes of emulsion formation during fermentation, because a better understanding on the microscale can give insights into how to improve large-scale processes and the process technology options that can address these challenges.

Charles A. Mullen - One of the best experts on this subject based on the ideXlab platform.

  • Mass Balance, Energy, and Exergy Analysis of Bio-Oil Production by Fast Pyrolysis
    Journal of Energy Resources Technology, 2012
    Co-Authors: Akwasi A. Boateng, Charles A. Mullen, Logan Osgood-jacobs, Peregrine Carlson, Nelson Macken
    Abstract:

    Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture (USDA). USDA is an equal opportunity provider and employer. Mass, energy, and exergy balances are analyzed for bio-oil Production in a bench-scale fast pyrolysis system developed by the USDA’s Agricultural Research Service (ARS) for the processing of commodity crops to fuel intermediates. Because mass balance closure is difficult to achieve due, in part, to the system’s small size and complexity a linear programming optimization model is developed to improve closure of elemental balances without losing the overall representation of the pyrolysis products. The model results provide an opportunity to analyze true energy and exergy balances for the system. While energy comparisons are based on heating values, exergy flows are computed using statistical relationships and other standard techniques. Comparisons were made for a variety of biomass feedstocks including energy crops and various byproducts of agriculture and bioenergy industry. The mass model allows for proper accounting of sources of mass loss and suggestions for improved system performance. Energy recovery and exergetic efficiency are compared for a variety of pyrolysis product utilization scenarios including use of biochar and noncondensable gases as heat sources. Exergetic efficiencies show high potential for energy utilization when all the pyrolysis product streams can be recycled to recuperate their internal energy. The exergy analysis can be beneficial to developing exergetic life cycle assessments (ELCA) for the fast pyrolysis process as sustainable technology for Advanced Biofuels Production.

  • analysis and comparison of bio oil produced by fast pyrolysis from three barley biomass byproduct streams
    Energy & Fuels, 2010
    Co-Authors: Charles A. Mullen, Akwasi A. Boateng, Kevin B Hicks, Neil M Goldberg, Robert A Moreau
    Abstract:

    Fluidized-bed fast pyrolysis was carried out on three different barley biomass coproduct streams, straw, hulls, and distiller’s dried grains with solubles (DDGS), from Saccharomyces cerevisiae fermentation of barley grain. Each of these byproducts of fuel ethanol Production from barley grain is a possible source of feedstock for Advanced Biofuels Production via fast pyrolysis. Bio-oil recovery was in the range of 42−50 wt % of the biomass, but optimized yields could be as much as 70 wt % for each feedstock when the mass balance is mathematically adjusted to account for all unrecovered products using optimization modeling. Biochar yields were 16−21% from the barley feedstocks. Bio-oil produced from straw and hulls had an energy content of 24−25 MJ/kg on a dry basis, while bio-oil produced from DDGS had a dry basis energy content >30 MJ/kg. The bio-oils were further characterized for composition and stability. None of the bio-oils were found to be shelf-stable, as established by an increase in average molec...