Rafael Ramos de Andrade
State University of Campinas
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Publication
Featured researches published by Rafael Ramos de Andrade.
Bioresource Technology | 2013
Rafael Ramos de Andrade; Francisco Maugeri Filho; Rubens Maciel Filho; Aline Carvalho da Costa
In this work, a kinetic model for ethanol fermentation from sugarcane bagasse enzymatic hydrolysate concentrated with molasses was developed. A model previously developed for fermentation of pure molasses was modified by the inclusion of a new term for acetic acid inhibition on microorganism growth rate and the kinetic parameters were estimated as functions of temperature. The influence of the hydrolysate on the kinetic parameters is analyzed by comparing with the parameters from fermentation of pure molasses. The impact of cells recycling in the kinetic parameters is also evaluated, as well as on the ethanol yield and productivity. The model developed described accurately most of the fermentations performed in several successive batches for temperatures from 30 to 38°C.
Applied Biochemistry and Biotechnology | 2007
Rafael Ramos de Andrade; Elmer Ccopa Rivera; Aline Carvalho da Costa; Daniel Ibraim Pires Atala; Rubens Maciel Filho
In this work, a procedure was established to develop a mathematical model considering the effect of temperature on reaction kinetics. Experiments were performed in batch mode in temperatures from 30 to 38°C. The microorganism used was Saccharomyces cerevisiae and the culture media, sugarcane molasses. The objective is to assess the difficulty in updating the kinetic parameters when there are changes in fermentation conditions. We conclude that, although the re-estimation is a time-consuming task, it is possible to accurately describe the process when there are changes in raw material composition if a re-estimation of parameters is performed.
Bioprocess and Biosystems Engineering | 2009
Rafael Ramos de Andrade; Elmer Ccopa Rivera; Daniel Ibraim Pires Atala; Rubens Maciel Filho; Francisco Maugeri Filho; Aline Carvalho da Costa
The accurate description of the kinetics and robust modeling of biotechnological processes can only be achieved by incorporating reliable methodologies to easily update the model when there are changes in operational conditions. The purpose of this work is to provide a systematic approach with which to perform model parameters screening and updating in biotechnological processes. Batch experiments are performed to develop a mechanistic model, considering the effect of temperature on the kinetics, and further experiments (batch fermentations using sugar cane molasses from a different harvest) are used to validate the effectiveness of screening before parameters updating. The reduction in the number of kinetic parameters to be re-estimated enabled by the screening procedure reduces significantly the complexity of the optimization, which makes the updating procedure to be significantly quicker, while resulting in accurate performance of the updated model.
Computer-aided chemical engineering | 2009
Elmer Ccopa Rivera; Félix de Farias Junior; Daniel Ibraim Pires Atala; Rafael Ramos de Andrade; Aline Carvalho da Costa; Rubens Maciel Filho
Abstract The application presented in this study illustrates the usefulness of an automated monitoring system carried out in LabVIEW environment. The results obtained have show that it is possible to infer into a real-time basis the key variables in bioethanol fermentation using pH, turbidity, CO 2 flow rate and temperature on line measurements and a MLP-based Software Sensor. On-line monitoring system provided accurate online predictions of the concentrations during the fermentation process even when the secondary variables measurements were noisy. This study also will illustrate the usefulness of an automated monitoring system carried out in graphical programming environment.
Biomass & Bioenergy | 2011
Sarita Cândida Rabelo; N.A. Amezquita Fonseca; Rafael Ramos de Andrade; R. Maciel Filho; Aline Carvalho da Costa
Fuel | 2014
Sarita Cândida Rabelo; Rafael Ramos de Andrade; Rubens Maciel Filho; Aline Carvalho da Costa
Biochemical Engineering Journal | 2007
Elmer Ccopa Rivera; Aline Carvalho da Costa; Rafael Ramos de Andrade; Daniel Ibraim Pires Atala; Francisco Maugeri; Rubens Maciel Filho
Applied Biochemistry and Biotechnology | 2010
B.H. Lunelli; Rafael Ramos de Andrade; Daniel Ibraim Pires Atala; Maria Regina Wolf Maciel; Francisco Maugeri Filho; Rubens Maciel Filho
Journal of Chemical Technology & Biotechnology | 2013
Rafael Ramos de Andrade; Sarita Cândida Rabelo; Francisco Maugeri Filho; Rubens Maciel Filho; Aline Carvalho da Costa
Chemical engineering transactions | 2014
Cal E; Ng Tran; Gustavo H. S. F. Ponce; Júlio C. C. Miranda; Moisés Alves; R M Maria; Rubens Maciel Filho; Rafael Ramos de Andrade; Leilane C. de Conto