Estrella Alvarez

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INTRODUCTION Bubble columns are widely used in industrial gas-liquid operations (e.g. gas-liquid reactions , fermentations) in chemical and biochemical processes industries, due to their simple construction, low operating cost and high-energy efficiency. In all these processes, gas holdup and bubble size are important design parameters since they define the(More)
A bubble column was used to study the heat effect on CO 2 absorption in methydiethanolamine solutions and on volumetric mass transfer coefficient. It was found that the temperature varied until 4 ºC between the beginning and the end of the process. Our studies provide an empirical correlation type Boltzmann to estimate the temperature at different amine(More)
The volumetric mass transfer coefficients at different axial positions in a bubble column were measured using a conductivity method. The absorption process of CO 2 in monoethanolamine solutions was carried out in a prismatic column 0.06 m side and 1.03 m height. Measurements were conducted at various gas flow rates and amine concentration. The local mass(More)
Determination of interfacial areas in absorption processes have been experimentally investigated in a bubble column using a physical method (photographic method) and a chemical method (Danckwerts´method). Experiments were conducted in a vertical column 11.3 cm in diameter and 108.6 cm in height. The range of variables used is common for both methods. All(More)
A control system based on a combination of the gain-scheduling control method and an adaptive PID controller was designed for the production of xylose from hardwood hemicellulose using a stirring tank reactor. Different operating conditions have been considered for estimating the adjustable parameter (theta) to take into account the changes of energy of the(More)
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