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Simulation of convencional, extrative and azetropic distillation for biothanol production process using nonequilibrium model and equilibrium stage model with efficiency

Author(s):
Tassia Lopes Junqueira
Total Authors: 1
Document type: Master's Dissertation
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química
Defense date:
Examining board members:
Antonio Maria Francisco Luiz Jose Bonomi; Carlos Eduardo Vaz Rossell; Marcio Eusebio Torres Alvarez
Advisor: Rubens Maciel Filho
Abstract

In Brazil, bioethanol is used to replace gasoline, being a percentage of this or used as an alternative fuel. This trend of replacing fossil fuels has gained strength globally, necessitating, therefore, alternatives and proposals to enable the increase of production in an economically and environmentally sustainable way. In this context, the energy optimization of the bioethanol separation aims the provision of sugarcane bagasse, used as fuel in process steam generation, for bioethanol production through the hydrolysis process. Consequently, innovations to the process are essential and improvement in the representation of models is required for studies and evaluations. In this work, simulations of the distillation step for the production of hydrous bioethanol and the bioethanol dehydration were performed using the simulator Aspen Plus®. In order to study a more realistic scenario, nonequilibrium stage model was used to predict the behavior of the involved distillation columns. Furthermore, the use of Barros and Wolf correlation for the determination of efficiency in equilibrium stage model for distillation columns was evaluated. The comparison between equilibrium and nonequilibrium stage models for conventional and extractive distillation processes indicated that the association between Barros and Wolf efficiency correlation and equilibrium stage model provides satisfactory predictions considering the nonequilibrium stage model as reference. For azeotropic distillation, formation of two liquid phases inside the column was studied, indicating that process parameters, such as feed position, have significant influence. The study of vacuum extractive fermentation, as an alternative configuration to fermentation and concentration steps, showed its potential for reducing energy consumption in the subsequent distillation step, and it seems a viable alternative to process intensification (AU)

FAPESP's process: 07/06160-9 - Simulation of conventional, extractive and azeotropic distillation for production process of bioethanol using nonequilibrium model and equilibrium stage model considering efficiency
Grantee:Tassia Lopes Junqueira
Support type: Scholarships in Brazil - Master