Category Archives: PROCESS SYNTHESIS. FOR FUEL ETHANOL. PRODUCTION

Process Integration by SSCF

In the case of lignocellulosic biomass, a very promising integrated configuration for bioethanol production is the inclusion of pentose fermentation in the SSF, as illustrated in Figure 9.6. This process is known as simultaneous saccharifica­tion and co-fermentation (SSCF). This configuration implies a higher degree of intensification through its reaction-reaction integration. In this case, the hydro­lysis of cellulose, the fermentation of […]

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Comparison of the Environmental Performance for Sugarcane Ethanol and Corn Ethanol

Using the simulation results from the last case study, the environmental assessment of bioethanol production from dry-milled corn employing the SSF process was car­ried out applying the WAR algorithm (Quintero et al., 2008). The results obtained were compared to the outcomes corresponding to the process for ethanol produc­tion from sugarcane.

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HYDROLYSIS OF CELLULOSE

The yeast Saccharomyces cerevisiae and the bacterium Zymomonas mobilis are not able to directly utilize the cellulose for ethanol production. In general, these microorganisms have the highest probability to be used in an industrial process for conversion of lignocellulosic biomass into fuel ethanol. For this reason, a step for cellulose hydrolysis (saccharification) to obtain a fermentable solution of glucose is […]

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Case Study. Stability Analysis of Continuous Ethanolic Fermentation

To describe the oscillatory behavior of continuous ethanolic fermentation using yeasts or bacteria, the mathematical model employed should contain the necessary expressions showing the variation of the state variables with time. Some models have been proposed with this aim and contrasted with the experimental data in order to validate their suitability. Among these models, the mathematical descrip­tion of Jarz^bski (1992) […]

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Environmental Aspects of Fuel Ethanol Production

This chapter deals with the wastes generated during the different processing steps for fuel ethanol production. The influence of the feedstock is recognized by the type of wastes produced. Main methods for the treatment of stillage (the major polluting effluent of all ethanol production processes) are discussed. In addition, the environmental issues related to the overall fuel ethanol production process […]

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Food Security versus Fuel Ethanol Production

The Food and Agriculture Organization of United Nations clearly defines the basis for food security existence: Food security exists when all people, at all times, have access to sufficient, safe, and nutritious food to meet their dietary needs and food preferences for an active and healthy life. The Rome declaration on world food security in 1996 established the strategies of […]

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Tert-Amyl Methyl Ether (TAME) and Tert-Amyl Ethyl Ether (TAEE)

The production of tert-amyl methyl ether (TAME) began at the commercial level at the end of the 1980s both in the United States and in Europe. TAME is used as a gasoline oxygenate like MTBE, but it uses another type of feedstock: tertiary olefins with five carbon chains (tert-C5 olefins) that exist among the components of the different kinds of […]

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