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In this study the flow pattern of a rotating drum reactor with internal baffles, used in the desulfurization of flue gas is analyzed at pilot scale. It is designed and built a reactor of 2.5 m in length and 0.22 m diameter and 10 cm thick which was placed eight equally spaced internal baffles. The reactor for different rotational speeds and for different solids flows is calibrated. One impulse sodium chloride forcing function is applied and measured at the exit of the same concentration for evaluating the dispersion behavior of plug flow, whereby the dispersion model whose Peclet number between 19 and 40 is adjusted, allowing assume plug flow behavior. [ABSTRACT FROM AUTHOR]

The importance of the processes of solid state fermentation taking place in this indispensable application of optimization in the design of new systems and for decision-making in the existing ones. The technological process have a production capacity of 100 t/d of dry product, including the preparation of the culture medium, the protein enrichment in fixed bed bioreactors, packaging and product completion. The main goal of this work is to optimize the process of protein enrichment of sugar cane bagasse from the determination of the values of the variables in the bioreactor operation: residence time and specific air flow, minimizing the cost of production unit. The process optimization was programmed modular lyon MATLAB 7.8 (2009). The optimal solution gave a residence time in the bioreactor of 11,8 hours and a specific air flow of 1,3 L kg-1 min-1. The minimum unit cost of production in these conditions was 74673 $/t PV. Sensitivity analysis allowed us to determine that the process is stable around the optimal. [ABSTRACT FROM AUTHOR]

The residues of the sugar industry have been used usually, natural or processed in the animal alimentation and have been developed a lot of investigations that are allowed obtain protein enrichment products by solid state fermentation (SSF). However, the technologies employed in the production have limitations that are restraining their commercialization. This investigation was directed to find solutions to the problems that are presented and was planted like objective: to obtain a mathematical model for the scale-up of the sugar cane bagasse's protein enrichment process, using the Candida utilis yeast, in a packed-bed bioreactor. The experimental work was realized in a pilot plant that have an installation for the air accommodation that is supply for the bioreactor, with a temperature of 30 °C and more than 95 % of relative humidity. Was used a mathematical model compose by a pseudohomogenous energy balance and the mass balances for the biomass overgrowth and the substrate consumption. The validation studies, was realized by the temperatures comparisons axially measure in 10 L and 100 L bioreactor and the temperatures calculated by simulation. The statistic treatment demonstrate that doesn't exist big differences between the middle temperatures, for a confidence level of 95 %. The analysis realized to characterize the obtained product, allowed establish that it is accord to quality specifications of the protein enrichment feed. [ABSTRACT FROM AUTHOR]