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reactive-distillations
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Equilibrium approach to reactive distillation calculations with identification of phases
, Article 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7, 28 August 2010 through 1 September 2010, Prague ; 2010 ; Avami, A ; Sharif University of Technology
2010
Abstract
A method for simultaneous phase identification and equilibrium calculations is put forward and applied on the highly nonlinear multiphase reactive distillation calculations. The method is based on modifying mole fraction summation equations. In the proposed methodology phase identification, phase equilibrium, and chemical reaction equilibrium calculations can be performed simultaneously and effectively. Simulation and optimization of equilibrium reactive distillation can be done efficiently using this approach. The methodology has been verified with the help of case studies. The method provides phases actually present at equilibrium, their quantities and compositions in each stage of the...
Shortcut design of reactive distillation columns
, Article Chemical Engineering Science ; Volume 71 , 2012 , Pages 166-177 ; 00092509 (ISSN) ; Marquardt, W ; Saboohi, Y ; Kraemer, K ; Sharif University of Technology
Abstract
Shortcut design methods can be valuable tools for rapid screening of different separation process alternatives to assess feasibility and determine minimum energy demand. This work presents a variant of the feed angle method (Kraemer et al., 2011), which applies to single- and double-feed reactive distillation columns. The proposed method relies on pinch point analysis and determines the minimum energy demand from the calculation of a tray at the feed pinch. It is fully algorithmic and insensitive to impurities in product specifications. Its validity and performance is illustrated by a variety of case studies covering multi-component and multi-reaction systems, mixtures with potential...
Conceptual design double feed reactive distillation columns
, Article CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference PRES ; 2012 ; Ceska Rafinerska; DEZA; Synpo; BorsodChem; Prazska Plynarenska a.s ; Sharif University of Technology
Abstract
An approach to assess feasibility and determine the feasible range of operating parameters for double-feed reactive distillation columns is put forward. It is based on the combination of analysis of the pinch point maps for the middle-section in compositional space and an efficient shortcut design method. The existence of the liming bounds on operating parameters is observed. The methodology is illustrated by the production of methyl acetate and ethyl acetate. The analysis provides an efficient method to identify the most promising candidates of double feed reactive distillation columns and to study the design flexibility in terms of operating parameters. This is an abstract of a paper...
Development of Optimal Integrated and Intensive Model of Energy Processing and Conversion
, Ph.D. Dissertation Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
In a single chemical plant, the operation of each unit operation is not independent of each other. In the other hand, the main operations are performed in reactors following by several separation steps including distillation and purification units. The total energy requirements are sullied by the heat exchanger networks. The performance of these systems is improved by integration and intensification of the reactor and distillation column in a single unit. The main objective of the present work is to provide an effective design approach to intensify the reactor and distillation column. In a reactive distillation column, the reaction and separation is done in a single unit. Increasing...
Simulation and Control of the Methyl Acetate Hydrolysis Reactive Distillation Process
, M.Sc. Thesis Sharif University of Technology ; Pishvaei, Mahmoud Reza (Supervisor)
Abstract
In a polyvinyl alcohol (PVA) plant, equal moles of methyl acetate are produced as byproduct for every mole of PVA. Since there is a little demand for impure methyl acetate, it is converted to methanol and acetic acid as raw materials of PVA plant via hydrolysis reaction. Duo to the small equilibrium constant of hydrolysis reaction of methyl acetate, the conventional process (including reaction and separation sections) suffers some problems such as large recycle flow and high energy consumption. Therefore, reactive distillation is introduced as an alternative for these processes. Since the reactive distillation integrates both reaction and separation in a single vessel, it has more complex...
An Optimization Model for Water and Energy Network based on Process Simulation for Production of ETBE from Biomass
, M.Sc. Thesis Sharif University of Technology ; Avami, Akram (Supervisor)
Abstract
Fossil fuel usage caused global warming and other environmental problems. Recently, biofuels are considered as an important alternative. However, the efficient usage of water and energy in their production may accelerate their diffusion. ETBE is a kind of oxidizing fuel additive that can be biologically produced from the ethanol reaction. High water and energy consumption in the production and separation process is still a challenge. In this work, the ETBE production from lignocellulosic feed are considered. Then, the effect of different parameters are investigated by performing sensitivity analysis. In the next step, the optimal pathway of water and energy use in the production of ETBE are...
Dynamic Simulation and Control of Reactive Divided Wall Column
, M.Sc. Thesis Sharif University of Technology ; Shahrokhi, Mohammad (Supervisor) ; Vafa, Ehsan (Supervisor)
Abstract
Due to the successful experience gained in the process intensification and implementation of Reactive Distillation and Divided Wall Column in industry, Reactive Divided Wall Column have also been considered as a further step in process intensification. One important research area in implementation of RDWCs is their control issue. In the present study, the dynamic simulation of reactive divided wall columns and their control were studied and the adaptive model predictive control was used for the control objectives. Aspen Dynamics software was used for simulation and MATLAB software was utilized for applying the control strategy. The advantage of the applied control method is the use of...